granprixweiss928

I have a noise I am trying to track down and I suspect oil pump.

I have another engine of same year that I can swap the pump from for a test.

is this OK to do?

Ducman82

should be just fine. re seal while you are at it

Mrmerlin

what was the last thing you fixed?

davek9

Wondering why you think it is the oil pump, that's a lot of work just to do a "test" swap.
Is this on the '81?

granprixweiss928

yes on my 81. 56K miles.

noise is a rpm dependent "whine". not normal. for sure mechanical, not vacuum or something intake related.

not AC/ALT/SMOG/or PS pump. not Fan. just replaced tensioner, roller, and all belts. WP has only 1500 miles (done by PO in 2009) and is a LASO. noise is concentrated on front of engine in the V.

because WP has low mile I suspect less. local 928 friends Speedtoys and Jim Morton suggested maybe Oil pump.

less timing belt tension = less noise (volume), more tension=louder noise.

oh and it was there prior to my TB work. but its less so now.

Mrmerlin

was the oil pump removed when the belt was done?

granprixweiss928

No, and the noise was present prior to my TB replacement.

took out the pump from spare motor tonight. PO used silicone caulk in there!