It's amazing how this guy makes everything clear. I've never heard of this test before, but I understood everything from a single viewing. I guess some people are just born to teach.
As a handy home mechanic that will fix just about anything on a car from head gaskets to diagnostics,, i have to say,, i have lots of respect for good professional mechanics which are hard to find,, i could never do this for a living working at a shop. I can do it,, i just take longer than the book says. Thx for the post
I've been building engines for about 10 years now and it I'd all the videos I've seen, you're probably one of the only guys that explained to others what exactly a rod knock looks like.
That was incredible. Best explanation and test ever, bar none! I now have a way to test the knock in my engine which I feel confident will work. Thanks so much!
This is the video I have been seeking for WEEKS, thank you. I have an 88 Accord with a knock but upon researching knocking sounds, there are different problems that sound the same to me. My husband swears it's the bearings which we have a rebuild kit but he's working full time all week, I do not have the knowledge to tear that far into this car myself lol. I am worried there is a bad rod or crankshaft bearings bc I do not have the ear to distinguish the differences in these sounds, they sound pretty much the same to me. And my exhaust is loose, no cat, it rattles along with this knock but I notice the engine knock right upon starting it, the exhaust doesn't usually rattle at that same second. Anyway, I'm glad I found this video, it helped me understand this issue WAY BETTER than my husband just telling me. Thanks!!
Dang does this make sense or what. At last some explanation instead of just the sound of rod knock. this might have just saved me lots of time and money making a specific diagnoses. Thanks very much
This video is amazing, the just right amount of humor, information, and visualization of what is going on. Though the image quality is ancient (as posted), WELL DONE all around!
This is quite clever and useful for a quick diagnostic with minimal invasion. I was just repairing an engine with a rodknock and it matches my experience as well. Thanks for the video.
Awesome technique and presentation. I've been working on cars/trucks over 50 years now and rebuilt a few engines and never heard or thought of this clever technique. Came across your video at perfect time. I have an F150 w/5.4 Triton in garage. o2 sensor failed and motor hydro-locked on gasoline attempting to start. Cam Phaser knock can sound similar. I have cams and timing components out and just tonight scratching my head trying to make decision how to proceed whether to replace faulty phasers and bad chain tensioners, only to find I have bent rod/bad bearing after the fact. Will sleep good tonight. Thanks Schrodingers Box!
So helpful! I don't know why you don't have over a million subscribers. I've learned more than what I would have on some other videos. It's about the methodology that you use and the logic that makes you such a knowledgeable mechanical engineer. When I get my next project car, I hope you are still around to tap your brain! Keep em coming! Thanks!
I have a feeling that I may have a knocking rod in our 11 HP Briggs Snapper RER. I will perform this test tomorrow and see what happens. Thank you, you are a scholar and a gentleman!
I'm just a newbie to this stuff and your channel, and you just helped me add another piece of knowledge into my diagnosing toolbox. love your channel and your explicit explanations and demonstrations.
Jose Oliveira Thanks man. Most of material really isn't newbie level but it should appeal to all people who use logic and reason regardless. It's the only way to approach things correctly.
this was an informative video. I learned more in 5 mins than I would of learned reading a manual. Thanks for uploading. 1988 Nissan 1.6L loud tapping noise on #2 cylinder? I'll try this tomorrow. Thanks again. Keep posting, I'll keep viewing.
very good video. my mechanic told me the noise from my engine was rod knock and proceeded to quote me a price for repair. i did your test and it passed. looking at removing pan now and checking cam bearing. good work!
Thanks for video perfect test to confirm terrible news. my ford 302 had an issues on #8 i wonder if there's a trend that the damage occurs on the furthest cylinder from the oil pump. (would have been smarter to test furthest to closest and save some time). thanks again for the time and effort you put in. I watch the adds through and click there links hoping you get a few more cents from the corporate machine.
I recall appreciate your videos. I am currently enrolled in school to become a mechanic and it is very difficult to understand sounds of motor problems from text books. These are some of the best videos on the Tube. Keep up the great work and I wish you much success.
So i ran into a rod knock. and i couldnt find bearings to replace so i bought a used set, piston+connecting rod w/ bearings on it, replacing the spun bearing with this new set will only temperately fix my engine, sooner or later itll just go out again?
Damn. Awesome video. Keep them coming! I wish we could have head that engine fire up to confirm its running noise. Lots of confusion on CZcams about that.
hi bro,.. nice video and tips.some question here sound knocking when i shift the gear to D or R in A/C running and quite when A/C turn off. 1.3 engine with fuel injection. thank you,..
That was pretty cool. I was wondering why you would want it on the downward stroke.... to create slack which will elicit the click when pressing downward. I hope I never need to perform this test.
@Jason Gauthier- The only way I could think to check for *evidence* of a bent or twisted connecting rod without removing oil pan would probably be to measure the exact point of TDC on each cylinder. A piston that shows to always have a lower TDC measurement than other cylinders would indicate a bent or twisted rod, causing a shorter stroke than straight rod. This is all that comes to mind off the top of my head.
Thanks for this. I am doing a partial rebuild on my engine and am wondering how deep I need to get into the bottom half. Cylinder head is off at the machinist, so this test should be even easier to perform. I already notice visually that all pistons appear visually to be at TDC for at least 10 degrees of rotation. Hmm....
Thank you for the video! I experienced a big drop in oil pressure and engine clunking so, presuming rod knock I drained the oil (no fragments!) and did this test (no play). So now I'm confused. What else could it be?
roff danials Excellent, looks like you might also be interested in my engine rebuild series though. Once you have rod knock, it's basically conclusive you need to replace or rebuild the engine. You can't just replace the bearing without machining the crank, not to mention all the metal in all the other bearings in the engine.
It's amazing how this guy makes everything clear. I've never heard of this test before, but I understood everything from a single viewing. I guess some people are just born to teach.
I still dont understand. Can u teach me
He is all about the “why!” That’s why I love this channel.
As a handy home mechanic that will fix just about anything on a car from head gaskets to diagnostics,, i have to say,, i have lots of respect for good professional mechanics which are hard to find,, i could never do this for a living working at a shop. I can do it,, i just take longer than the book says. Thx for the post
I dont think he's a pro mechanic. I believe he is a microbiologist.
This video deserves an award. Self disinterest, everything about the topic, applause.
Wow. That is one great video.
I agree. You can tell that he cares more about informing people than anything else. He's also a great teacher.
"when the bearings disintegrate into your oil you'll think Tinkerbell lives there" lol
I've been building engines for about 10 years now and it I'd all the videos I've seen, you're probably one of the only guys that explained to others what exactly a rod knock looks like.
That was incredible. Best explanation and test ever, bar none! I now have a way to test the knock in my engine which I feel confident will work. Thanks so much!
This is the video I have been seeking for WEEKS, thank you. I have an 88 Accord with a knock but upon researching knocking sounds, there are different problems that sound the same to me. My husband swears it's the bearings which we have a rebuild kit but he's working full time all week, I do not have the knowledge to tear that far into this car myself lol. I am worried there is a bad rod or crankshaft bearings bc I do not have the ear to distinguish the differences in these sounds, they sound pretty much the same to me. And my exhaust is loose, no cat, it rattles along with this knock but I notice the engine knock right upon starting it, the exhaust doesn't usually rattle at that same second. Anyway, I'm glad I found this video, it helped me understand this issue WAY BETTER than my husband just telling me. Thanks!!
You reminded me of a lesson I had 30 years ago! Backyard Mechanic, Shade Tree Mechanic or Teacher. No difference!
That is one of the most impressive ideas I've seen in a lot of years. The simplicity is amazing!
Thanks for your common sense approach to diagnosing this problem. I'll check out your other vids while I'm here. I'm glad I found you.
Thanks for the very descriptive troubleshooting guide. I’ll be doing this tomorrow on my 1997 Accord.
Best, most concise, and informative youtube video this watcher has seen.
Dang does this make sense or what. At last some explanation instead of just the sound of rod knock. this might have just saved me lots of time and money making a specific diagnoses.
Thanks very much
Hell yeah this Video is helpful. Now i know a new skill. Thank you for sharing knowlege. Your video deserves a award man.
Superb diagnosis, explanation and demonstration.
Use moly, ptfe is not good.
You should do it to prevent not to FIX. Lucas will form a gum in engine
This video is amazing, the just right amount of humor, information, and visualization of what is going on. Though the image quality is ancient (as posted), WELL DONE all around!
Yes this was one of my earliest videos before i invested in stereo HD
This is quite clever and useful for a quick diagnostic with minimal invasion.
I was just repairing an engine with a rodknock and it matches my experience as well.
Thanks for the video.
Awesome technique and presentation. I've been working on cars/trucks over 50 years now and rebuilt a few engines and never heard or thought of this clever technique. Came across your video at perfect time. I have an F150 w/5.4 Triton in garage. o2 sensor failed and motor hydro-locked on gasoline attempting to start. Cam Phaser knock can sound similar. I have cams and timing components out and just tonight scratching my head trying to make decision how to proceed whether to replace faulty phasers and bad chain tensioners, only to find I have bent rod/bad bearing after the fact. Will sleep good tonight. Thanks Schrodingers Box!
That moment when you realize that your engine is fucked #fuckmybankaccount
Honestly one of the most well explained and professional video ever. You are awesome.
I like the way how you explain things for like us who's not familiar with that. Thank you so much for taking your time making this video.
Spot on demonstration, easy to understand, brilliant !
Wow - I wish I had seen this years ago to really understand rod knock. Great presentation and information. Thanks!
So helpful! I don't know why you don't have over a million subscribers. I've learned more than what I would have on some other videos.
It's about the methodology that you use and the logic that makes you such a knowledgeable mechanical engineer.
When I get my next project car, I hope you are still around to tap your brain!
Keep em coming! Thanks!
Right! How did it take so long for this video to find me? Bravo man.
Finally someone who goes straight to the point and just explain this perfectly. 👏👏👏
That was explained perfectly! Gonna change my bearings tomorrow and this video gave me a load of confidence. Thanks!
I 2nd that this guy deserves an award, you can apply this to just about any engine! Great idea!
I have a feeling that I may have a knocking rod in our 11 HP Briggs Snapper RER. I will perform this test tomorrow and see what happens.
Thank you, you are a scholar and a gentleman!
My left ear enjoyed this video :D
your channel has changed a lot since 2012! Keep it up!
Looks like you did it again man. This is phenomenal! I wish I had thought of it, its such a common sense approach.
This video is as good and informative as the old army video explaining fluid coupling of a torque converter. Two thumbs up 👍👍 and a like 👏!
damn. i cannot believe how helpful this simple video is!!!!
Very well done. You put and often over-explained issue into perfectly simple words. Thanks . And stay out of Schrodingers Box!
Hey that was a good video and it was well explained.
I'm just a newbie to this stuff and your channel, and you just helped me add another piece of knowledge into my diagnosing toolbox. love your channel and your explicit explanations and demonstrations.
Jose Oliveira Thanks man. Most of material really isn't newbie level but it should appeal to all people who use logic and reason regardless. It's the only way to approach things correctly.
I love your videos. You explain what to do AND WHY. Thank you!
Really good explanation, thanks, I only had a vague understanding of what rod knock was before, now it makes complete sense!
Much thanks -- I'm going to try this later in the week on a Toyota 3SFE that I suspect of rod knock.
omg where has this video been??? I WAS gonna scrap my car but now I want to try to tackle this. Great job buddy this is so valuable!
Best video on CZcams bar none.
Very well explained and demonstrated!Thanks!🤗
thank you so much I always learn a whole lot watching your videos. Today not only did I learn something new, I saved 100$.
This clarifies for me the source of the knocking. Excellent tutorial, can't be any better. Thanks.
Glad it was helpful!
That was very nicely explained. I really appreciate it. I have subscribed to your page and hope you have more. Thanks again.
Thank you very much , that was really very helpful .
Excellent presentation. Thanks Mr. Mechanic
Absolutely awesome video. You couldn't have made that any more simple to understand.
this was an informative video. I learned more in 5 mins than I would of learned reading a manual. Thanks for uploading. 1988 Nissan 1.6L loud tapping noise on #2 cylinder? I'll try this tomorrow. Thanks again. Keep posting, I'll keep viewing.
very good video. my mechanic told me the noise from my engine was rod knock and proceeded to quote me a price for repair. i did your test and it passed. looking at removing pan now and checking cam bearing. good work!
Travail Enligne Why would you possibly remove the pan to look at cam bearings?
ever so grateful for this video , wonderful talk through on this ! thank you so much !
Nice video, thank you for taking the time to publish it.
Great explanation and diagnose of rod knock! Thanks!
That's a neat idea and might especially be useful to me as I try to figure out if my short block is junk. thanks
Thanks for video perfect test to confirm terrible news. my ford 302 had an issues on #8 i wonder if there's a trend that the damage occurs on the furthest cylinder from the oil pump. (would have been smarter to test furthest to closest and save some time). thanks again for the time and effort you put in. I watch the adds through and click there links hoping you get a few more cents from the corporate machine.
Dale Anderson my brother I truly believe tinker Bell lives inside your engine
Thank you sir for this video . Excellent job on explaining very informative. Thank you
I love your video sir. don't have enough words to thank you.
Thanks you, It help me fix my detroit series 60
You are one of the best mechanics that youtube can get....!
Man you are King, what a great explanation, very cool.
On the position of ''tumble''
Great testing method
Nice & very interesting practical video
I recall appreciate your videos. I am currently enrolled in school to become a mechanic and it is very difficult to understand sounds of motor problems from text books. These are some of the best videos on the Tube. Keep up the great work and I wish you much success.
Very nice to explained with practical thumbs up 👍
great simple quick explination
Thanks for your videos, Very much appreciated.
Great video! Learned something new today :)
best explanation I ve ever seen .now I understand what happened to my little 1.2 Renault car
bro i will spread your mastery to those worthy. great old timer type trick
Great video. Thanks for posting it.
keep up the good work!! I am tired of those crappy video making hacks all over CZcams
Very detailed explanation.
So i ran into a rod knock. and i couldnt find bearings to replace so i bought a used set, piston+connecting rod w/ bearings on it, replacing the spun bearing with this new set will only temperately fix my engine, sooner or later itll just go out again?
Thank you very much! I did indeed find this very useful!
Damn. Awesome video. Keep them coming! I wish we could have head that engine fire up to confirm its running noise. Lots of confusion on CZcams about that.
Very great video. Super helpful. Just so scary to check your own pride and joy.
Awesome vid!
I know what I'm doing this weekend, good job,Great idea
Short precise and well explained there.
Thanks
Excellent testing idea
Nicely explained, thank you very much!
Excellent video and explanation
hi bro,.. nice video and tips.some question here sound knocking when i shift the gear to D or R in A/C running and quite when A/C turn off. 1.3 engine with fuel injection. thank you,..
Wow very helpful video .. Thanks
EXTREMELY Helpful Thanks!!
Excellent vid! Thanx for this.
Thank you. Excellent video.
NICE! thats a good little trick!
Thanks for the Video! It was helpful!
good explanation man! good job well done
u rock dude! Another great vid! thanks!
Excellent test
That was pretty cool. I was wondering why you would want it on the downward stroke.... to create slack which will elicit the click when pressing downward. I hope I never need to perform this test.
bg147 u just answered you’re own question Genius. Congratulations!!
@@sterlingwitherspoon5709 I think he's more asking why does putting it onto the downward stroke creates slack
Great video. Thanks for the help.
@Jason Gauthier- The only way I could think to check for *evidence* of a bent or twisted connecting rod without removing oil pan would probably be to measure the exact point of TDC on each cylinder. A piston that shows to always have a lower TDC measurement than other cylinders would indicate a bent or twisted rod, causing a shorter stroke than straight rod. This is all that comes to mind off the top of my head.
Found it very helpful, Thanks
Thanks for this! Got a Sub!
Thanks for this. I am doing a partial rebuild on my engine and am wondering how deep I need to get into the bottom half. Cylinder head is off at the machinist, so this test should be even easier to perform. I already notice visually that all pistons appear visually to be at TDC for at least 10 degrees of rotation. Hmm....
Thank you for the video! I experienced a big drop in oil pressure and engine clunking so, presuming rod knock I drained the oil (no fragments!) and did this test (no play). So now I'm confused. What else could it be?
Did you check the lifters and condition of the camshaft lobes
Excellent explanation
I have both cylinder heads off for a valve job, might as well see if it was knocking too, neat trick using the downstroke
thank you so helpful you have saved me a lot of effort isolating the cylinder
roff danials Excellent, looks like you might also be interested in my engine rebuild series though. Once you have rod knock, it's basically conclusive you need to replace or rebuild the engine. You can't just replace the bearing without machining the crank, not to mention all the metal in all the other bearings in the engine.
roff danials I learn something new. I have rod knock on a diesel engine. thank you for the education
BEAUTIFUL video hopefully my 01 mustang cobra engine does not do this because I’m getting a tick from the engine