Oil pressure relief valve - plunger

[EBavely]

This is a multi-part message in MIME format.
--
[ Picked text/plain from multipart/alternative ]
Hello all...

Still in pursuit of the elusive oil pressure problem on the 4ktq (MC motor)=
.  Readings proved to be the same with the mechanical gauge as well as with=
 the other gauges, so I pulled the oil pump on the engine and will replace =
with a known good one.

I've received several emails asking whether I have installed the oil pressu=
re relief valve plunger correctly.  Presently, after what I've seen on seve=
ral engines, the whole valve consists of:

1=2E  A threaded plug or a temp sender (as in the 4kq) and a washer
2=2E  A spring
3=2E  A plunger  (piston) with a machined (stepped end) and an open end

It's been my understanding that the machined end of the plunger (with the s=
tep or "nipple") goes into the spring itself.  In other words, the step fit=
s into the internal diameter of the spring.  This means that the open end w=
ith the beveled edge fits up into the pump body.

Can anyone confirm this orientation?  Et_ka and the Bentley seem to show th=
e assembly put together like this....

Also, has anyone ever seen wear on the plunger? All the plungers appear to =
have the same part number in Et_ka, but has anyone seen a plunger with wear=
 on the outside of it causing it to move more freely in its bore?   It's a =
long shot, but I wanted to see if anyone has seen this...That'd certainly c=
ause a pressure "bleed", wouldn't it?

Mine looks fine, but at this point, "I'm getting down to the nitty grit" (a=
s the Beasties would say).

Thanks in advance.


Elliott Bavely

86 4ktq (anybody seen the bridge? where's that confounded bridge?)
83 CGT
81 Coupe ITB
88 80 Fwd
83 GTI FSP
83 GTI 16V
90 VW Cabriolet