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2.9 Top End replacement advice


franklin2

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I would measure the pushrods you have now. Way longer or shorter pushrods will put the rocker tip in a different location on top of the valve tip. The rocker tip actually sweeps across the valve tip when it's running, so you want this centered, not favoring one side of the valve tip or the other.

This is what you get when replacing parts. Things are not always black and white like you think they would be. It can be a hassle sometimes.
 


eightynine4x4

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Another question… if/when removing and then reinstalling the lifters…. I understand they can be stuck in the holes because of slight deformation of the mating surfaces, and that a lifter removal tool may be necessary to get them out. That’s all fine. But is it always the lifters themselves that are deformed? Or can the bore diameter / lip be deformed too? If that’s deformed, is it standard procedure to attempt to clear the edge of the hole by grinding it until the lifters slides smoothly in and out of the hole?
From what I can tell, during engine operation the lifters do come up higher than the tops of the holes, and slide partially into the mating hole in the head’s underside. So if that’s true, then any restriction of the lifter movement is a major issue.
I’m hoping that if I find that my lifters are stuck and do need to be pulled with a tool, that using new lifters solves the problem and the holes don’t need to be “bored” at all. Hoping that any deformation is just the lifters mushrooming themselves.
 

franklin2

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It doesn't have to be deformation to make the lifter stick. Most lifters stick when trying to pull them on any engine. Once you get in there, you will notice all the metal parts of the engine are a brownish color. Not a grey metal color. This is a carbon film on all the engine parts where the oil has been "cooked" over time. It's this brown varnish which will hang you up pulling the lifters on most engines. Some sort of solvent sprayed around the lifter and running down around the bottom of the lifter will soften the varnish up some.
 

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