The Smartest Reason for Correct Valve Clearances!
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- čas přidán 5. 07. 2023
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Introducing my other Channel "Things to Know" - which i'm just getting started. It's a go-to channel for insightful worldly explanations, handy tips, and expert advice on everyday things and repairs of domestic items. Here is the link: / @thingstoknow3645
There can be a number of problems that negatively affect the performance and dependability of the engine if the valve clearances are not set properly. The following are some possible effects of using inappropriate valve clearances:
Noise in the valve train might be caused by insufficient valve clearance. When the valves make contact with the rocker arms or cam followers, they could generate a ticking or tapping noise. On the other side, excessive valve clearance can cause a loud knocking sound as the parts of the valve train collide. These annoying noises are a sign of incorrect valve clearance settings.
Poor Engine Performance: Poor engine performance can result from incorrect valve clearances in a number of ways. A loss of compression may result from the valves' inability to fully close if the clearances are too tiny (tight). Reduced power output, poor fuel efficiency, and probable fires might result from this. On the other hand, high clearances (loose) might alter the timing of the valves, which will lead to inefficient combustion and poorer engine performance.
Increased Wear and Damage: Improper valve clearances might put too much stress on the parts of the valve train. The valves and seats may prematurely wear if the clearances are excessively tight and the valves stay slightly open. Due to this wear, the sealing effectiveness may be compromised, leading to compression loss and eventual valve burning. Additionally, if the clearances are excessively slack, the valves may strike the cam followers or rocker arms with too much force, speeding up wear and perhaps leading to component failure.
Interference between the valves and the pistons during their respective strokes is a possibility in engines with small valve clearances. This condition, known as valve-to-piston interference, can seriously harm the pistons and valves, possibly leading to bent pistons and valves as well as catastrophic engine failure.
Reduced Valve Lift: Poor valve clearances can restrict the maximum lift of the valve, which can limit the volume of fuel and air that can be injected into the cylinder as well as the volume of exhaust gases that can be released. The performance of an engine can be hampered by reduced valve lift, which can affect throttle response and power output.
To guarantee good engine functioning, longevity, and top performance, it is crucial to follow the manufacturer's recommendations and recommended valve clearance settings. These problems can be avoided and the health of the engine maintained with frequent valve clearance inspection and adjustment.
Thank you
Craig (Owner and Creator of The Repair Specialist Channel)
#ValveClearance
#EnginePerformance
#ValveTrain
#EngineMaintenance
#ValveAdjustment
#ValveToPistonInterference
#EngineRepair
#ValveLift
#EngineEfficiency
#ValveWear
#AutomotiveMaintenance
#ValveHealth
#InternalCombustion
#ValveTiming
#EngineSafety - Auta a dopravní prostředky
Hi guys I just wanted to Introduce to you my other Channel "Kirkman's Academy" - which i'm just getting started. It's a go-to channel for simple explanations for hard to grasp subjects such as physics, maths and chemistry etc. Here is the link: www.youtube.com/@kirkmansacademy/videos . Thank you so much for looking, and if these topics interest you then I hope to see you the there. Many thanks indeed. Craig 😊👍
so for excessesive push on the valve spring (no clearance + extra push) can cause overheating resulting on lean sparkplug reading?
Hi is it good to have a 0.05mm intake and 0.06mm exhaust valve clearance for 125cc pushrod engine?
excellent! how many people now have a clear understanding now as to why they set the clearances. thanks
Hands down the best four-stroke video I have ever seen.
Thank you so much. I really appreciate it. Craig 👍👍👍
Man.. this is genosity. You could be a proffesor ;D
Thank you so much. Craig
Seriously…this Gentleman’s channel is the best of CZcams.
Wow. Thank you. I really appreciate your kind feedback. Craig 👍👍👍👍
Perfect explanation. 🙏 I’m glad I stumbled upon your channel
Thank you ! It explain very whell why I have to check my valve clearence often on my motorcycles !
Craig another well put together video. A very thorough explanation of how the valve train functions. Thank you for sharing. 👍
Thanks so much Artie. Craig
Plenty of videos out there about HOW but this is great to explain WHY. I'm about to adjust the valve clearance on an old Mercedes diesel which I realize is different mechanically but much of this absolutely applies. Well done.
Thank you so much for your kind feedback and good luck with your Mercedes Diesel valve clearance adjustment. Craig 👍
Nice video. The cutaway motor is a great tool to show this
Thanks 👍
Very nice thats why time to time my motorcycle exhaust note sounds different than the last time we check the clearances... and the engines response too
Excellent Dissertation ! Well Done, Sir !!! 🤓👍
Very thorough guide! Excellent video!
Your the best! Thank you for your teachings!
Loved the clarity and detail, and as a DIY unschooled mechanic, I learned some good points.
Since learning about it, I have been setting my valves as near to "zero-lash" as possible always allowing for pushrod rotation when valve fully closed
I'm delighted to hear that you enjoyed my video on 4-stroke valve clatter/lash and found it helpful for your mechanic endeavors! It's fantastic that you've taken an interest in setting your valves and striving for a "zero-lash" adjustment.
Indeed, paying attention to the finer details like allowing for pushrod rotation when the valve is fully closed can make a significant difference in how your engine performs. It's all about achieving that optimal valve clearance to ensure efficient combustion and minimize noise.
Keep up the great work, and if you ever have more questions or need further advice on any DIY mechanical tasks, feel free to reach out. Learning and hands-on experience are key in this field, and your dedication is truly commendable!
Thanks again
Craig
Really appreciate this explanation
Nice demonstration and explanation. I had a rough understanding of the importance of valve clearances. But, this cleared up a lot of my un-educated guessing as to what exactly was happening. I am nearly certain valve clearance issues are causing rough start and performance issues on my lawn tractor.
Best explanation I have ever seen!
Great visual explanation
Brilliantly explained - thank you!
You're very welcome! Thank you. Craig
Best explanation on CZcams! Bravo
Wow, thanks!
You got a subscriber. Cool explanation 💯
Thank you so much for explaining, your way of teaching makes so much sense even for my dense head.
Cheers
You're very welcome! Thank you for your feedback. Craig 👍👍👍
Excellent demonstration. Thank you for sharing!!
You are welcome! Thank you
That lecture has been so helpful to me
Thank you 👍👍
Well explained, keep up the good work.
Clearly spoken, very well presented.
Good Luck, Be Happy.
Very good info thank you
Very Enlightening Indeed. How much we take things for Granted. Just Finishing off some work on my 1970 Cortina Mk2 1600 so will definitely look into this area. The engine though is done only about 4000kms since a full overhaul.
Thanks. Very helpful
As one wag once said concerning valve clearances, "I'd rather hear 'em than smell 'em"!
I prefer to adjust them at the correct clearance so things aren't slapping around.
slow and gets to the point very easilly, woow! great content
Thank you 👍
Very nice explication
Thank you so much for your super informative videos. Really very helpfull. Learning so much.
You are so welcome! Thank you. Craig 👍
Great explanation. Thank you.
You are welcome! Thank you 👍👍
Good one thanks
Nice job thanks
Indeed I gain knowledge in this video
What a brilliant and easy to understand explanation, top job! Liked and subscribed.
Awesome, thank you so much for your kind feedback. I really appreciate it. Craig
Great content love your channel
Very well done sir!
Thank you! Cheers!👍
Than you very much for this very informative technical video. Appreciated a lot.
👍👍👍
So nice of you. Thank you. Craig
Quality content thankyou.👍
Thanks brother it's very helpful to watch this
Always welcome
Thanks for sharing very interesting video greetings from mexico
Thanks for you video i really like them
Best video I found
great video thanks
Visuals are awesome. TY
Thank you so much 👍👍👍
GREAT MATE THANK YOU
So great explanation
Thank you so much 🙏
You're most welcome. Thank you
Dam... I did t know of anything about valves and engine, but now I sure do know thanks professor you did great
Thank you so much. Craig
Very informative, do you now anyware I could find the correct valve setting for a citroen u25 1993. Diesal none turbo..
And there's a huge slice taken out of the cylinder wall, leading to low compression.
😂👍
I'd be interested in seeing the leak-down test results...
Perfect video!!!!
THANKS FOR THE INFORMATION
No problem! Thank you for your feedback. Craig
Great video!
Glad you enjoyed it. Thank you
Great Video Thanks 👌
My pleasure! Thank you. Craig
What do you think about valve lashes to tight on my Honda rancher 350 trx I have oil coming out my exhaust and blow by tube in air box do you suppose this could be caused from over tight valves
Good work
Thank you so much 😀
THE BEST EXPLANATION
Thank you for your kind feedback. Craig
Thank you
You're welcome
Thanks alot🎉
You're very welcome!
Is it ok to set tappet loose after a fresh engine rebuild? the idea is to let valve seat to adjust properly cause they were built new too.
Great!
Do valve clearances get larger as time goes on? Or do they get smaller? Or can they do both?
I was told my warranty was denied for assumed reasoning. The engine failed because a tappet struck the spark plug. How is this possible?
I heard that valve clearances get tighter over time due to valve seat recession. Is that correct?
Does the incorrect tappets set contributes to more fuel consumption?
just a mention, did you know that you can increase compression in a lot of applications, by having a larger lash on the intake valve,,,,, why you ask? because just like it takes a little longer to start opening the intake valve when the intake lash, it also closes sooner, so that the piston may not started traveling upwards or traveled upwards as far, giving more stroke of the piston with the valves closed to build compression, basically its a very crude way to change cam timing
I'm wondering why there's any suction force in the cylinder during the later part of the power stroke. I thought the pressure in the cylinder at this stage would be higher than atmospheric.
Unless, the expansion of gases during combustion isn't enough to fill the cylinder when the piston is at BDC. Is this a consequence of volumetric efficiency (i.e. no naturally aspirated cylinder is ever 100% filled during the intake stroke) so there's bound to be a slight vacuum at BDC of power stroke?
What am I missing?
I find that the toughest part is determining what stroke the engine is on when the flywheel is not marked, so I pull the spark plug and put a screwdriver in the hole and crank the engine until the piston tops out and screwdriver is at its highest point. Both valves are all the way up or in closed position. Then I check clearances with a feeler gauge. On a 9.5 Kohler they say .005 for intake and .007 for exhaust on a cold engine. Does this sound right to you. The engine really gets hot during continuous log splitting operation and smells hot sometimes. I think it needs better cooling system myself as well as a hydraulic oil cooler. I run 30 weight HD motor oil above 60 degrees F and 15w40 Rotella below 60 down to about 35 F. Anything colder gets full synthetic 10w30. The manual also says to ALWAYS run at full throttle. It's a screaming beast of a wood splitter.
Hey there!
Your method of determining the stroke of the engine sounds resourceful-using a screwdriver to gauge the piston's highest point and checking the valve clearances with a feeler gauge is a great way to ensure everything's in sync. Regarding the Kohler 9.5, those clearances (.005 for intake and .007 for exhaust on a cold engine) seem pretty standard for that model. It's crucial to maintain these clearances for optimal engine performance.
It's interesting that the engine heats up significantly during continuous log splitting operations. Improving the cooling system sounds like a smart move, especially considering the demanding nature of the work it's handling. Additionally, the idea of adding a hydraulic oil cooler might help with temperature regulation, ensuring smoother operation during those intense splitting sessions.
Your approach to using different oils based on temperature variations is quite thoughtful. It's essential to adapt the oil viscosity to the ambient temperature, and your choice of motor oil seems well-suited to the engine's needs.
Ah, the manual's advice to always run at full throttle! That certainly paints a vivid picture of your wood splitter as a real powerhouse. It's impressive how it operates at maximum capacity, showcasing its true beastly nature.
Your hands-on approach and attention to detail are commendable. If there's anything else you're curious about or need further assistance with, feel free to reach out. Wishing you continued success in taming that beastly wood splitter!
Thank for sharing your info
Craig
Something else that is notable: It the engine runs out of fuel and dies when the ram is in the up stroke the engine will not start until the lever is put in the center or unloaded position. Owners manuls don't tell you this. Also I finally got spec sheet from Kohler on that valve clearance. It is .003 to .005 for BOTH the intake and exhaust valve. Every shop I called had different numbers here,....the ding bats. I reset both to .004 and it starts and runs much better now and I don't usually have to use the choke any more. Saweeeet. Remember you have a 4 stroke cycle going on and make sure you adjust valve clearance at TDC on the compression stroke. With plug out it is easy to tell. Put finger or thumb in plug hole. You get suction then compression which pushes your finger off the plug hole. TDC or a couple degrees after TDC on COMPRESSION stroke is what you want. Sweet & simple. @@TheRepairSpecialist
One thing about the exhaust valve opening earlier to swirl in air. The exploded gasses are still expanding. When the exhaust is opened, it is done so that the burnt gasses wouldn't push back on the piston creating resistance on the exhaust stroke.
The moment the valve is opened, burnt gasses that are still expanding rush out trough the valve opening (and create the exhaust sound). I don't think air could have a chance at entering the cylinder - at least from my knowledge.
Nice explanation 👌 so in theory you want the exhaust valve titer than the fuel valve mate. To keep the temps down. On engine and the let all smoke come out of port
Thank you so much for watching my video on valve clatter, and I appreciate your interest in the topic!
In theory, adjusting valve clearances can indeed have an impact on engine performance and temperature control. However, the specific valve clearance settings can vary depending on the engine design and manufacturer's recommendations. It's not necessarily about having the exhaust valve tighter than the inlet valve, but rather about achieving the correct clearance for each valve.
The main goal is to ensure that the valves open and close at the precise moments as specified by the engine's timing. This allows for efficient combustion, which helps with power output and emissions control. Tighter clearances can sometimes help reduce valve noise and improve low-end torque, but it's essential to consult your engine's manual or the manufacturer's recommendations for the proper valve clearance specifications.
Ultimately, the goal is to maintain a balance between valve clearances to optimize engine performance, minimize noise, and ensure proper sealing. If you have more specific questions about your engine or valve adjustment, don't hesitate to ask, and I'll do my best to assist you further.
I hope this has helped a little
Craig
Brilliant
Thank you so much 👍
Greetings, in short, should the oral cavities be more open or less open? Thanks
Yeah I like it!
So here’s a question if anybody sees this and wants to chime in. I am looking at doing a valve adjustment on a KTM 390 engine and a lot of the tutorials I found on CZcams adjust the valve clearances on the looser end of the spec range as opposed to the tighter end of the range? They state they do that because they’re worried about the cylinder head hitting the valves. However, based on this video that doesn’t seem likely unless the engine is not timed, right. It also seems less likely on the intake instead of exhaust. In my mind going tighter in the gap range would leave room to wear thus staying in spec longer?
Hello ,a question if you have time ofcource.
Talking for a motorcycle (yamaha crypton T110) that
having lets say 3rd ,4th gear and going with no throttle downhill
then (always) hearing/happening burn fuel at exchaust (lets say every 10 seconds etc)
So my question is ,,,suppose that carburator is fine(that maybe is not)
Is it possible that incorrection adjustment ( or damage) in valves
is provoking this chap of noise ?(that propably also make loose fuel more than it needs-not burned correctly fuels)
Thank you in advance,
Hi there! Naturally, I'm pleased to assist you with your Yamaha Crypton T110 question. It's excellent that you're observing your motorcycle's sounds and behaviours. Although the issue may have something to do with the valves based on what you've mentioned, it's important to take other things into account as well. Incorrect valve adjustment or damage may be the cause of the noise you're hearing and inefficient fuel burning, but it's also a good idea to check other parts like the air filter, spark plugs, and ignition timing.
All of these may have an impact on your motorcycle's overall performance and how well the engine burns fuel. To ensure an accurate diagnosis, it could be a good idea to get the vehicle inspected by a qualified mechanic if you are unsure about the issue. Please don't hesitate to inquire if you need help or have any further questions. Enjoy your ride!
Thanks
Craig
@@TheRepairSpecialist Thank you very very much. I ve just asked to be ready to face some strange engineers that even they dont know directly or even they just want my few money.Thats why,,,OK,,,i will check them as you ve said...Thank you for your video-lessons !!!
Jim,,greedings from Athens(greece)
PS..i like that noise because its making feel as Colin mcray coming to a corner !!(heheh)
..but i must correct it sometime !
Why do the tappets have a ‘side to side’ wiggle to them?
Good explanation.
So will my bike start if the exhaust valve is to tite
Thank you so much for your feedback! 😄 I'm glad you found the explanation of the 4-stroke valving system helpful.
Regarding your question about the exhaust valve being too tight, if the exhaust valve clearance is too tight, it can affect the engine's performance. It might make it harder for your bike to start, as it could lead to insufficient exhaust valve lift and compression. However, this also depends on how tight it is and other factors.
If you suspect that the exhaust valve clearance is off, it's a good idea to check and adjust it according to your bike's specifications. Proper valve clearance is essential for optimal engine performance and starting reliability.
If you need guidance on how to check and adjust the valve clearances or have more questions about your bike's maintenance, feel free to ask. I'm here to help! Craig
Hi, nice explanation! Now let me ask You something .. can it (the too big clearance) cause a noticable 'tapping' sound but only for the first 2-3 seconds after cold start? Can the oil 'dampen' the sound if the clearance is already too big, but only a bit? (the sound is not noticable when the engine is warmed up). I'm trying to diagnose the sound I get when cold starting my 1G-FE (Lexus IS200). If You can shed some light it would be awesome.
Anyways, thanks for the video!:)
Hello! I'm glad you found the explanation helpful, and I'd be happy to provide some insights into your cold start tapping sound.
Yes, excessive valve clearance or lash can indeed lead to a tapping sound, especially during the first few seconds after a cold start. When the engine is cold, clearances that are already on the larger side can become more noticeable because the metal components haven't expanded as they do when the engine warms up. As the engine heats up, the clearances can decrease slightly, which may explain why you don't notice the sound when the engine is warmed up.
Oil can act as a dampening agent to some extent by filling the extra clearance space between the valve and the rocker arm or camshaft. So, when the engine is cold, and the oil is thicker, the tapping sound might be more pronounced. As the oil warms up and becomes less viscous, it can provide better cushioning and reduce the noise.
To diagnose and potentially address the issue, you could consider checking and adjusting the valve clearances according to your vehicle's specifications. If you're not comfortable doing this yourself, a qualified mechanic should be able to assist you. Additionally, ensuring that your engine's oil level and viscosity are within the manufacturer's recommendations can also help mitigate valve noise during cold starts.
I hope this sheds some light on your situation, and I wish you success in resolving the tapping sound in your Lexus IS200. If you have any more questions or need further assistance, feel free to ask!
Thanks
Craig
Incredible
Thank you so much. Craig 👍👍👍
Do you have to change valve cover gaskets everytime you do a valve clearance?
Not if there's no apparent damage to them
When the air fuel mixture starts off compressed, and is ignited and expands, how could there ever be a vacuum during any point of the power stroke?
How to adjust from hardpully start to smooth pully start.?
thank you for reaching out with your question about adjusting valve clearances to make the recoil easier to pull on your engine.
When you experience difficulty pulling the recoil starter, it could indeed be related to the valve clearances being out of adjustment. The recoil can feel harder to pull if the valve lash (clearance) is too tight, causing increased resistance in the engine's compression stroke.
Here are the general steps to adjust valve clearances, which can help alleviate this issue:
Consult the Manual: Refer to your engine's owner's manual to identify the specific valve clearance specifications for your model.
Prepare the Engine: Ensure the engine is cool and turned off. Remove any necessary components to access the valve cover and rocker arms.
Locate Top Dead Center (TDC): Rotate the engine to the TDC position for the cylinder you are working on. This is typically indicated by aligning timing marks or by positioning the piston at its highest point on the compression stroke.
Check Valve Clearance: Use feeler gauges to measure the clearance between the valve stem and the rocker arm. Compare the measurements to the specified clearances in your manual.
Adjust if Necessary: If the clearance is incorrect, loosen the locknut on the rocker arm and adjust the valve clearance by turning the adjusting screw. Tighten the locknut once the correct clearance is achieved.
Reassemble and Test: Reinstall any removed components, ensuring everything is securely fastened. Start the engine and test the recoil starter to see if the pulling action feels easier.
By following these steps and adhering to your engine's specific specifications, you should be able to adjust the valve clearances effectively. If you're unsure or have difficulty, don't hesitate to consult a professional mechanic or refer to detailed service manuals for your engine model.
I hope this helps guide you through the process of improving the recoil operation on your engine. If you have further questions or need clarification, feel free to ask. Happy tinkering with your engine!
Best regards,
Craig
Sir .. Thank you , very detailed step by step explanation . I am working in tractor diesel engine and we have "Tappet Noise" is the top most problem at our end . I am looking for the way to trouble shoot this concern. The operators follows the SOP of setting the gap on the engine assembly line . However when some of these engines go in the testing we here "Tappet Noise " at Low Ideal speed just start of the the test cycle and at the full load also . Will you please guide us on how to go step by step for the root cause analysis . We did it with one "Good : and One " Bad" engines but it was not leading us to any root cause.
Pl help us.
Thank you
Ajay
Hi
Tackling "Tappet Noise" in tractor diesel engines can indeed be a tricky challenge. It's commendable that you're looking for a systematic approach to troubleshoot and resolve this concern.
When it comes to identifying the root cause of tappet noise occurring during testing, conducting a methodical root cause analysis is key. Here are a few steps that might help you in this process. However please take this as a guide only and to ensure your safety and the safety of your machines are met first and during the operation:
Review Assembly SOP: Double-check the Standard Operating Procedures for tappet adjustment during assembly. Sometimes, even minor deviations during assembly might result in this noise issue.
Check for Consistency: Ensure that the adjustment made during assembly is consistent across all engines. Variations or inaccuracies could lead to tappet noise in some units.
Verify Components: Assess the quality and condition of tappets, pushrods, and related components. Any wear or inconsistencies could contribute to the noise.
Oil Quality and Pressure: Evaluate the oil used for lubrication and ensure it meets specifications. Low oil pressure or poor quality oil might affect tappet performance.
Testing Parameters: Review the test parameters and conditions to replicate the issue consistently. Check if there's any correlation with specific testing conditions leading to tappet noise.
Acoustic Analysis: Consider employing tools for acoustic analysis or sensors to pinpoint the exact source and nature of the tappet noise.
Comparative Analysis: Compare various aspects between 'Good' and 'Bad' engines, including assembly records, test data, and any deviations in parts used or adjustments made.
Professional Assistance: If the issue persists, seeking the advice of expert engineers or specialists might provide new insights into the root cause.
Remember, the key to successful troubleshooting often lies in methodical and systematic analysis.
I hope ths helps a little
Best regards,
Craig
Dear Craig ,
Good Morning..!
Thank you for your immediate response . It is much more in detailed approach for the analysis and made easy for me to understand. Today We have planned analysis with two engines which we have hold for tappet noise . We will follow the step by step approach .
Please help to understand what is the role of .
We have not worked or thought of this aspect ever.
@@TheRepairSpecialist
HI SIR. DO YOU KNOW VALVE CLEARANCE FOR HYUNDAI 420CC? 6/8. OR DIFFERENT?
Hello! It's great that you're looking into the valve clearance specifications for your Hyundai 420cc engine. Valve clearance is an important aspect of engine maintenance, as it ensures that the valves open and close properly for optimal engine performance.
For the Hyundai 420cc engine, the specific valve clearance can vary based on the model and its application. However, many small engines like this typically have valve clearance specifications in a common range:
Intake Valve Clearance: Often set between 0.004 and 0.006 inches (0.10 - 0.15 mm).
Exhaust Valve Clearance: Usually slightly larger, around 0.006 to 0.008 inches (0.15 - 0.20 mm).
BUT PLEASE NOTE: these are general guidelines and may not be accurate for your specific engine model. It's crucial to refer to the Hyundai engine manual or contact a Hyundai dealer or service center for the exact specifications. The manual will provide detailed information on how to measure and adjust the valve clearance correctly.
Remember, working on engine valves requires precision and caution. If you're not comfortable with this kind of maintenance, it's advisable to seek assistance from a professional mechanic. Proper valve clearance is essential for engine efficiency, performance, and longevity, so it's important to get it right.
Awesome.
Q. Maybe because that is a. "Mock" engine, but why is there that "square wave" looking ring under the piston rings? I have never seen a piston with anything that looks like that.
It's an "expander" for the Oil Control Ring. That helps the ring exert the correct pressure to the cylinder wall.
i just pulled my cylinder head to inspect due to a failed cylinder leak down test, my question is; is it normal for some valves to not be seated in the closed position?
Hi. When you remove the cylinder head of a small 4-stroke engine, it is not uncommon to find some valves that are not fully seated in the closed position. This is because the engine's valves are controlled by a camshaft and valve springs, and their position can vary depending on the engine's timing.
In a 4-stroke engine, there are typically two types of valves: intake valves and exhaust valves. These valves open and close at specific times in the engine's cycle to allow air and fuel into the combustion chamber (intake valves) and to allow exhaust gases to exit (exhaust valves).
During the engine's operation, the camshaft and valve springs work together to open and close the valves at the right times. When you remove the cylinder head for inspection, the valves may be in various positions, and some may not be fully closed.
If you find that some valves are not seated in the closed position, it's generally not a cause for concern during disassembly. However, when you reassemble the engine, it's crucial to ensure that the valves are correctly timed and seated properly. Improper valve seating or timing can lead to poor engine performance, loss of compression, and other issues.
Before reassembling the engine, consult the manufacturer's service manual or repair instructions for your specific engine model to ensure you follow the correct procedure for valve adjustment and timing. This will help ensure that the valves are in the correct position for proper engine operation. If you're unsure about the process, it's a good idea to seek guidance from a qualified small engine mechanic or refer to the engine's manual for detailed instructions.
I hope this has helped a little
Craig
Would this noise be under load at about 2500 rpm’s?
thank you for reaching out with your question about tappet noise under load at around 2500 RPM.
Tappet or valve noise can indeed occur under specific conditions, such as when the engine is under load at certain RPMs. Here are a few factors to consider regarding tappet noise:
Valve Clearance: Insufficient valve clearance can cause tappet noise, particularly under load or at higher RPMs. If the clearance between the valve stem and rocker arm is too tight, the valves may not fully close, resulting in noise due to contact with other engine components.
Engine Load: Under load, especially at mid-range RPMs like 2500 RPM, the engine experiences increased stress and demand. This can accentuate any existing valve clearance issues or mechanical vibrations, leading to audible tappet noise.
Oil Pressure and Lubrication: Proper oil pressure and lubrication are essential for maintaining optimal valve operation. Low oil pressure or inadequate lubrication can contribute to tappet noise, especially when the engine is working harder under load.
Other Factors: Additionally, factors like worn valve components, camshaft wear, or timing issues can also influence tappet noise under load conditions.
To diagnose and address tappet noise under load at 2500 RPM, I recommend the following steps:
Check Valve Clearances: Verify that the valve clearances are within the manufacturer's specified range. Adjust if necessary.
Inspect Engine Components: Look for signs of wear or damage on valve train components, including the camshaft, lifters, and rocker arms.
Evaluate Oil Condition: Ensure the engine is using the correct type and grade of oil, and check oil levels and pressure.
Consider Professional Inspection: If the issue persists or if you're unsure about specific components, consulting a qualified mechanic or technician for a thorough inspection would be beneficial.
I hope this information helps shed light on potential causes of tappet noise under load. If you have further questions or need assistance, feel free to ask. Thank you for being part of our community!
Best regards,
Craig
It’s not that the valve will begin to close too soon, it’s that there’s less distance for it to travel now, so it closes sooner.
Opens later, closes sooner, valve still opens and closes as per the profile of the cam. A minor gripe, but I think an important distinction.
Great video, I think it breaks down the basics very well!
Ok, so what should I set them at?
All engines have different clearances as specified by that particular make and model of engine manufacture. If you have your owners service manual, it may inform you in there, or do a Google search for valve clearances for (your engines make and model)
👍👍
And all this happens lets say 12'000 per minute /superbike. It is 200 times per second! This is incredible!
Yeah. Even at 3,000rpms it's insane to think that piston is up-and-down 50 times a second.
What is the correct gap
The correct gap depends on your particular engine. Many manufacturers have different settings for different makes and models. If you find your make and model of engine and perform a Google search then you should find your correct settings
what clearance for cg200 engine sir please tell me i have high flow exhaust
Gee, I wish I would have seen this in the 7th grade.
You have to mention how the cam grind is designed to open up the valve at the right angle of the camshaft design and closing. That way you're not beating up your valve train or burning up the valves.
❤😮
Please note that is an Engine with a mechanical camshaft and cam followers.
Therefor his targot is rocker arm to valve stem "clearance", rather than cam follower pre-load, as required with a hydraulic camshaft and cam followers.