6.4L -- Rocker Arm Bridge Fell Off??? - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 04-01-2014, 08:16 PM Thread Starter
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Exclamation 6.4L -- Rocker Arm Bridge Fell Off???

Have a 2010 6.4L, EGR/DPF deleted, exhaust, tuner, couple other things.

Couple weeks ago the idle started going funky and revving a bit, non-rhythmically. I cold start her a couple days ago and a loud popping noise shows up out of no where. The noise quiets down with some throttle, & with enough stops completely. I opened the hood and it's coming from the intake area. Read the code off my tuner and it's a P0284: cylinder 8 contribution/balance. I figure it must be something to do with the #8s intake or exhaust valves.

So I dig into her and eventually get the valve cover removed. The rocker arm bridge is off of one side of the exhaust valves. The bridge looks fine, the rocker arm locks fine, push rod is straight as she could be, and no damage to the valve spring.

Am I being too optimistic figuring the bridge just "fell off"? Has this ever happened? Or is it the hydraulic lifter. What's my best plan of action? Should I rebuild Humpty and hope everything works out, or should I pull the heads?

Secondary question, I've heard the injector fuel lines need to be replaced once removed--is this true?

Any help is super appreciated.


Cheers,
SBH
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post #2 of 5 Old 04-07-2014, 06:26 AM
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I don't know how many miles you have on your truck, it could be a collapsed lifter. The first thing I would do is to check the ends of the rocker arm for wear. The 6.4 had a really bad problem with wear and some would crack right at the pivot point but mostly on 08's. If that arm is worn, change them all, the new assemblies are only about $200 per side.
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post #3 of 5 Old 04-07-2014, 06:00 PM Thread Starter
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It has about 70k miles (110k km) on her.

I pulled the intake push rod the next day & it was bent to hell. I figured there was some chance it bent and the cylinder misfired and back-pressured the exhaust side to knock the rocker arm bridge off, so I bought a new push rod from Ford & torqued the rocker arms back on cylinder 8... but the exhaust side is lagging (the push rod isn't really pushing up against the rocker arm socket).

It's looking absolutely like a lifter at the moment... is there any chance the push rod bent first and knocked it off, or am I being too optimistic again?

Second question: assuming I'm SOL & have to pull the heads (going to attempt myself, cab down), what should I replace while I'm in there? I'm figuring at minimum I'll need/want upper gasket set, head studs, the lifters, and a set of chromoly pushrods. Should I replace the valve springs, too? Is there any worth to HD up-pipes (I have EGR deleted; there's also no chance of me sending my stock up-pipes in) or a down pipe?
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post #4 of 5 Old 04-07-2014, 06:04 PM Thread Starter
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Quote:
Originally Posted by SBHayes View Post
It has about 70k miles (110k km) on her.

I pulled the intake push rod the next day & it was bent to hell. I figured there was some chance it bent and the cylinder misfired and back-pressured the exhaust side to knock the rocker arm bridge off, so I bought a new push rod from Ford & torqued the rocker arms back on cylinder 8... but the exhaust side is lagging (the push rod isn't really pushing up against the rocker arm socket).

It's looking absolutely like a lifter at the moment... is there any chance the push rod bent first and knocked it off, or am I being too optimistic again?

Second question: assuming I'm SOL & have to pull the heads (going to attempt myself, cab down), what should I replace while I'm in there? I'm figuring at minimum I'll need/want upper gasket set, head studs, the lifters, and a set of chromoly pushrods. Should I replace the valve springs, too? Is there any worth to HD up-pipes (I have EGR deleted; there's also no chance of me sending my stock up-pipes in) or a down pipe?
I should note that I turned it over by hand after I torqued the rocker arms on & felt both pushrods move. Figuring the cam should be fine then, right?
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post #5 of 5 Old 04-09-2014, 07:43 AM
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You may have just had something happen in which you bent a pushrod and that's all, fix it and your finished. You can pressure test your system to see if your valves are closing.
In the event that you have to pull the head, I would visually inspect the cam as best you can and use a long thin screwdriver to "feel" the cam lobe. If you have a serious problem, you should know. I personally wouldn't change any more than you need to and definitely not valve springs unless there is a problem.
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6.4l , intake , popping , push rod , rocker arm

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