1.  Must you drain the oil from the 1.9L engine before you remove the valve
covers?

2.  About 1 week ago my engine started a tapping.  It sounds like a
collapsed lifter, so I read up on it in the archives.  I drained off some
oil, replaced the filter with a new one, and poured in about a quart of
marvel mystery oil. I let it idle for about 15 mins and drove it for an
additional 15 mins.  No change in the tapping.

What should I do next?  I thought maybe I should adjust the rockers.  When I
did some push-rod tubes I adjustect the rockers.  Some of the lifters were
springy, so I just held them firmly inplace while I did the adjustments.
The engine ran quiet and well for about 3,000 miles, probably more.

Should I just readjust the rockers??   Just drive it and hope for the best?
(To the best of my knowledge, there is no change in performance since it
started tapping)

Bradley Flubacher
State College, PA