5kTQ Valve Tap

[Michael Spiers <mikes@specnet.com>]

OK, so I went home last night and went to put on my new shock mounts.  Got the
one on OK, but the @#$% allen hole stripped out on the other one, so I had to
drive the thing over to a friends to go at it with his air compressor.  BTW, a
22mm box end wrench & 6mm allen key-socket mount was all I needed, the hell
with that $60 socket!  (The way I torqued it, by the way, was to use a torque
wrench on the allen socket, and let the torque wrench push agianst the hood
support.  I pulled on the open end wrench until the torque wrench clicked.  Is
this an accurate way to measure torque?)  Anyway, the Quattro hasn't been run
since last Thursday, when I started it for the first time after changing the
timing belt and heard a really loud tapping noise, what I deduced to be a
lifter I squished installing the new timing belt.  I bought a stethescope
thingy and was going to try to figure out which lifter was bad last night
before I drove it over to the air compressor.  Started it up, went up front -
stethescope in hand, NO TRACE of a valve tap.  None.  What happened here?!?  I
drove it over to his house, argued with the shock nut for a half an hour,
finally I won and the thing came off.  Installed the new mount, drove it home
(a total round trip distance of three hundred yards) and let it idle in the
driveway until operating temperatures.  The valve tap was there, but you had to
listen REAL close.  Anyway, I stuck my new stethescope all over the head and
valve cover trying to figure out where the knock was coming from, but the only
thing I could really trace was a dragging sound which came from the hydraulic
pump.  Where EXACTLY should I be putting the stethescope tip to determine the
source of the valve knock?  Do I need to partially dissassemble the engine?
 Everything short of the grill and front bumper were on the car, so the engine
was completely as it normally would be.  TIA on how to use my new toy!  BTW,
I've done ZERO since I heard the valve tap originally to try and alleviate this
noise.  I changed the oil w/Valvoline DuraBlend, but the noise was still there
after I did it last week.  Is it possible the semi-synthetic just soaked into
the lifter while it was sitting and fixed things up?  I'm very curious about my
self-fixing engine!

-Mike
87 5000CS TQ