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Collapsed lifters?
Hi all, I have a 99 Suburban here that has some huge valve train noise. Popped off a valve cover and the rockers are all loose, some were REALLY loose. The don't appear to be collapsed, what I can see thru the little holes, that is. Are these engines known for rocker arm nuts backing off or do I have bad lifters? I'm afraid if I tighten down the rocker nuts, I might have a bunch of bent push rods when the lifters pump up again. Good oil pressure, BTW.
I would think that when the engine is at rest, the springs would push the lifter up all the way regardless of oil pressure. Am I thinking correctly here?
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