Continuously Leaking Water Pump on 740 GL

Hi all,
Well I put on a new waterpump last year after noticing it was leaking
when I bought
my 1990 740 GL wagon. After a few months I noticed it was leaking
again. Took it
to a Volvo mechanic (in fact, ONLY works on Volvos) and he repaired
it. Looked good
and tight. Drove maybe six months and now I see it is leaking
again!! What gives?
Is their some type of factory design flaw here or what? Thanks for
any help/advive.
jimmy

 

Where is it / was it leaking from?

Same spot each time?

 

Yes, it seems to leak from where the top gasket fits on (you
know, where they tell you to "put a lot of pressure on" when
tightening it up or it will leak ;-) I can see where I might have
not tightened it properly, but I can't believe my mechanic (who
is a guru, and many other folks agree so) can't get it either...
Btw, I moved 5 states away or I would just take it back to
him again and let him give it another shot. Anyone know of
a good Volvo mechanic in Rochester, MN?
thanks,
jimmy

 

Yes, it seems to leak from where the top gasket fits on (you
know, where they tell you to "put a lot of pressure on" when
tightening it up or it will leak ;-) I can see where I might have
not tightened it properly, but I can't believe my mechanic (who
is a guru, and many other folks agree so) can't get it either...
Btw, I moved 5 states away or I would just take it back to
him again and let him give it another shot. Anyone know of
a good Volvo mechanic in Rochester, MN?
thanks,
jimmy





I smear a light coat of silicone calk on the rubber before installing the
pump, never had one leak.

 

Perhaps there is some corrosion on the mating surface for that upper
o-ring? Another possibility is that the o-ring installed wasn't of the
best quality. Was this a Hepu, Volvo or some other top quality water
pump? They are not all equivalent.

John