Re: getting a knocking/tapping at idle after enigne warms up
It reads like when the oil heats up and becomes thinner, a lifter is not staying pumped up, has too much clearance and bleeds down. Or maybe the idle is too low. Listen carefully to find/locate the noise. Most important step. Crawl underneath to listen for the flywheel noise, it will be louder there than listening over the fender.
One way to find out, heat the engine up, listen for the noise, try to localize it to a cylinder about the valve cover using either a stethescope or screwdriver, remove the valve cover, and turn the engine over to bring the suspect cylinder up to compression, and check the pushrods for being able to spin by two fingers and NO clearance or excessive play.
If the suspect cylinder appears to be good, check the other three cylinders by the same method. If you find a loose pushrod, then a lifter swapout is the next order of business. as long as you have good oil pressure, lifters should not be noisy, nor should the rest of the engine, for that matter.
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