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Re: Tappet Problem - Help!

Ross, The factory procedure for checking hyd lifters is basically rotating
the camshaft until both lobes for that cyl are pointing up, then trying to
depress the lifter with a piece of wood. The spec for movement(per Bentley)
is .1mm. So if it moved, it's bad. Hyd lifters are usually stored upside
down, so if you install a new one, allow it to sit for 30mins to "bleed down"
before starting the motor.

As a side note, you're sure it's the lifters causing your tapping, not the
vac pump that's driven off the cam, right? That's a known cause for such
noises, and the cures aren't as easy....

Hope this helps,
Chris Semple
'87 4000csq