Re: Engine tapping noise
Could be a stuck lifter, meaning the inner body is stuck in the bottom of the outer body.
To locate, if using a stethoscope, or a long screwdriver with your thumb over the handle and pressed against your ear canal, you can do another method.
Bring engine up to operating temp and shut down.
Remove valve covers.
Turn engine over by hand and:
When exhaust valve starts to open, check intake valve for looseness.
Continue to turn engine.
When intake is almost closed, same cylinder, check exhaust valve for looseness.
You can start at the firing order and follow it through.
If you find a loose rocker, adjust out slack plus a 1/2 turn, and wait for some time, maybe 5-10 minutes.
You should be able to turn pushrod by your fingers as spring pressure will bleed down lifter.
If not, this is your stuck lifter.
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