2013 Ford F350 6.2 Misfire - Broken Valve Spring Replacement
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- čas přidán 29. 08. 2024
- 2013 Ford F350 with a 6.2 had a misfire on cylinder 8. Ended up being a broken intake valve spring. Pull the valve cover, coil, spark plug and rocker shaft off the affected side of the engine. Install either rope into the cylinder or use a compression fitting to apply air pressure to cylinder whil on top dead center and the use a valve spring compressor to compress the spring. Once the spring is compressed enough you can remove the valve keepers fron the valve and remove the spring. Check the valve seal for damage as the broken spring can tear the seal. Install the new parts in reverse order.
the torque spec for the rocker shaft is as follows.
step 1 - 10nm(89inlbs)
step 2 - 20nm(177inlbs)
step 3 - tighten additional 60 degrees
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Great video bro but just wanted to add I know you mentioned it but for those people that doesn't have the fitting or air ready or available
get some vacuum line like 1/8 in or so and about 6ft hand crank the engine to BDC (put a screw or something on the end of the line so it's easy to pull out) coil the line in the cylinder about 3 ft and then roll the engine by hand back up as far as it will go it will stop and you won't be able to crank any more thats when you know that the line is up against the valve and you don't have to worry about losing air pressure and you can change the spring
just wanted to add that for the guys that didn't know this method otherwise awesome job explaining this
Man thank you so much for this video. This video made it so easy to change out the valve spring. My truck just went to backfiring and running like crap and had no power. So I babied it to get it home. I put a computer on it to see what codes I had and it was calling multiple misfires. So I changed my plugs wires and coil packs. After that it was only misfiring on the driver side. So I pulled my valve cover and sure enough the exhaust valve spring on the number five cylinder was broken. Great video man. Keep it up 🤟🏻
I have a dancing misfire. Will open this up tomorrow. Thanks for sharing
very good job on the video even with the missing footage. I really liked the torque spec at the end. thanks again.
Replaced a broken valve spring on my 2011 6.2 about a 2 months ago and i believe it needs another one replaced now. Only 124k miles. Might just do them all and be done with it.
That’s a bummer. Most of the ones I repair get just the one and then they are good to go. I have yet to see another fail on the same engine.
@@ThePracticalMechanic Took the valve cover off and it's broke right next to the last one i did. Ordered 15 more.
I have a 95 DOHC V8 lincoln continental and it needed this repair. Same type break. This engine looks much more servicable! You don't need the tilt tool. I used to rope trick.
The only thing I don't understand is how the valve don't smash! I was amazed it ran after.
alb12345672 Since there is nothing forcing the valve to be open they normally don’t get smashed. The might only be open a tiny bit more than they are supposed to be and close slower than normal. Thanks for watching. 👍🏻👍🏻🔧🔧
Great video,I have to ask,how come you didn’t clean all the heavy junk around the inside of the valves?
Can we get a video on the proper way to inspect the rocker arm shaft assembly as well? I have what seems to be a rocker tap, but I'm not entirely sure.
How were you turning the motor over? Ratchet on the cam sprocket bolt? Did you reuse the rocker bar bolts? That kinda sounds like a torque to yield spec for new bolts. Just curious what parts I need to plan for.
Great video. Nice to see you on Nimmin Live.
Thanks. I really enjoy watching the Nimmin Bros on Saturday mornings. Good clean entertainment.
Good video. Like the towel and scope idea. I would have dropped both retainer clips into the engine.
Thanks.
Now let’s talk smack. Seems like broken valve springs are common on newer Fords? No.
Never heard of this in older Ford engines. Could this be from the use of inferior steel used to produce the springs?
A dual spring design would have been better choice. Cost cutting would be the most likely reason.
Troll Master I’m not sure why the new ones are breaking valve springs like they are but I bet your correct and they are now using inferior materials to save money. Increased emission control make vehicles cost more to engineer and produce so they cut cost on certain components that end up failing prematurely.
I have dropped retaining clips in the past and had to go fishing for them so now I try to do what I can to prevent them dropping where I can’t get them.
I'm wondering. I had this happen at 188k miles, another youtuber said his went at 215k. All trucks had this problem on cyl 8, so maybe it's a heat issue in that part of the engine or something.
Steve Johnson that is possible. Many vehicle have issues with the rear most valve on both banks because the exhaust is often hotter at the rear of the manifold. I’m not sure if that heat would effect the spring or not but it could. At least they are lasting around 200k because I’ve seen dodge/Jeeps with less than 100k breaking valve springs.
What do you consider "new"? From when?
I have seen this issue plenty. And it happens on all cylinders at all different milage. Just did one friday that had 64k miles on the #6 exhaust valve
dang, how many miles did you have on it? the 6.2L are pretty bulletproof from my understanding, this is quite a shock to see
I can remember how many miles this on had. Under 200k. I have only seen a few of them do this. They are generally a great engine.
@@ThePracticalMechanic I have been looking at Fords with this engine and heard that some engines have had this happen. Do you know if this is widespread through the 6.2 production or for a certain production cycle?
ajl0426 I had a 2016 do this last week. Unfortunately the valve hit the piston and broke off causing damage to the piston and the head. That is the newest one I have seen this happen to.
@@ThePracticalMechanic Thanks for the reply/info. I have not followed Fords that much since I sold my Gen II Lightning years ago. Just doing a quick search, it does happen on other displacement Ford V8 engines too, so whoever is supply Ford these springs needed to have better QC. I only found 1 company so far that makes aftermarket springs; Livernois Motorsports. Summit does not show any springs for a 6.2.
Is this a common problem on the 6.2 Ford? Does anyone know what is causing these valve springs to break? It seems broken valve springs will happen on all of the cylinders in this engine, It's not just the back 2 cylinders.
Jaspers remanufactjred engines states they are using shorter valve springs with a shim at the bottom so maybe the spring is too long and weak
How much air pressure in the leak down tester to keep the valve closed?
Thank you so much for the video.
Thanks chief.
Good evening, Blessings, greetings from San Carlos, Costa Rica, I am interested in buying a 2014 6.2 Ford F150 Raptor. Seeing information, they say that the 6.2 gasoline engine breaks the valve springs. The question is, how many kilometers or miles do the valve springs break? of that 6.2 l question is to prevent changing springs before their time that they break and cause serious problems in the engine
Most of the ones I’ve seen are between 80k and 100k. I see it more often in fleet vehicle for some reason.
Good morning Blessings then c it is a fact that they go bankrupt every 80 thousand. km 100 thousand km the best in theory is to change all the springs and valve seals every 100 km, what do you think would be the best
Thank you for this video. I just replaced my broken exhaust valve got everything back together and the truck runs great but that side of the motor is ticking now. Any ideas off the top of your head. I torqued everything to spec. no check engine light anymore
It’s possible that the lifter hasn’t pumped back up yet or one of lifters was on its last leg before disassembly. If it doesn’t clear up you may have to pull the valve cover again and check for rocker arms that have slop. It that are all tight then rotate the engine over some and check again.
@@ThePracticalMechanic Wow thank you. Great ideas. I really appreciate the response. I will subscribe if I can. Awesome.
Looked everything over today on the truck......dumb mistake, exhaust spark plug wire on number 4 wasn't firmly on the plug. it was causing all the ticking because it wasn't firing. Just thought everyone should know if they have a similar problem.
Truck is running beautiful now. Just like new.
Chris Augspurger Sweet you found the issue. At least it wasn’t a mechanical issue.
My 2011 f250 is occasionally misfiring on cylinder #1. Is cylinder 1 located closest to front of vehicle on passenger side? Also, if occasional misfire, could it still be the valve spring broken?
Bro loosen exhaust rocker shaft up if the pressure spins the engine almost always happens when leaking down a good cyl and the valve drops then what
I have a misfire in cyl no 8 on a 4.6l f150. New plugs and cops. After watching your vid , I'm wondering if a broken valve spring is my issue. I haven't heard of this on the 4.6. Thoughts ? Thanks.
I have seen a couple with issues but not many. I have seen rocker arm issues and camshaft issues as well. Have you checked to make sure you have spark back there? Fuel injector firing?
@@ThePracticalMechanic I have spark. I will check the fuel injector and then compression. Thanks for the reply.
What is the tightening torque used by the flute of the rocker arms?
I have a misfire on a 5.0l. Very inconsistent. Any chance you could help
Those are common for valve sealing issue that require cylinder head removal. A valve job or head replacement required.
I think this happened to my 2015 f 350😩 what is the normal price repair for a job like this. I am getting a qoute of about $5000.00
If repairing the one valve like I did in the video its a couple hour job. If replacing all the springs on one side of the engine it will likely be 4-5 hrs. Most shops are $80-130 per hour depending on where you live. Some dealership will not so the job because there is a chance that there is more damage. the $5000 quote was probably for replacement cylinder head to be installed or other major mechanical work.
Do they make performance rockers for the 6.2l?
Does ford have a service recall or service bulletin on these? Seems like this is a fairly common flaw? My 17 f250 is in the shop getting the number 3 cylinder spring changed as we speak.
How much did it cost u
I wonder why are so many 6.2L engines having valve spring issues? I have never seen a GM engine with a broken spring. Is it because of a higher valve lift rate than other engines?
My Jasper engine rep told me it has to do with the height of the valve spring and the way the spring starts to vibrate at certain rpm. Jaspers fix is a slightly shorter spring with a spacer to correct the spring pressure.
@@ThePracticalMechanic Did he give any specs on the spring and what spacer to use. I am in the market for a 6.2L F250. I am learning what issues to look for and fixes and improvements. I also read they have oil burning issues. I test drove a 2018 yesterday with 112k miles on it. The truck ran fine but what turned me away from that truck was that the oil level was extremely low, only on the tip of the dip stick.
I read the oil burning issue could be a design flaw with the baffle in the right valve cover for the PCV system. It's causing oil to get drawn into the intake manifold.
@@ThePracticalMechanic I noticed this is a beehive style spring with what appears to be a variable spring rate. I am curious as the the engineering behind this spring choice. I know part of the design is to reduce reciprocating mass but the difference in coils per inch has me wondering it's purpose. I don't see that in GM engines. There is definitely some harmonics issues causing fatigue failure.
How much a job like this comes out too?
It really depends. If its just one spring it is probably $200-300 plus diagnostic time, if your replacing more than one it will go up. Most shops won't have the tools or the confidence to do it this way and they may want to replace the cylinder head.
what dose a tore valve seal look like ?
The top of valve seal should have a small metal spring that holds tension on the seal and valve stem. On this vehicle the upper portion of the seal and the spring got smashed and torn by the valve spring. If the seal is damaged it may cause oil consumption and smoking out the tail pipe as well as catalytic converter failure if driven long enough.
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