Water Pump Installation

alancordeiro at att.net alancordeiro at att.net
Sat Oct 17 05:20:08 PDT 2009


In three timing belt changes, two on the 200q, I have just cleaned the 
surface with 1000 grit emory cloth, then lightly greased the outside surface 
of the o-ring where it mates to the engine block to facilitate sliding while 
I rotate the water pump to tension the belt. However, I have not had to 
resolve the "grove" issue either....my blocks have always come out smooth 
after the cleaning.

No leaks from any of my installations so far. There is minimal pressure 
inside the cooling system, and a correctly torqued down water pump with a 
fresh o-ring should have no need for extra sealants. In fact, it may be 
possible that the sealant used by the previous replacement may have 
contributed to your groove effect.


----- Original Message ----- 
From: "Kneale Brownson" <kneale at knitknacks.com>
To: <200q20v at audifans.com>
Sent: Friday, October 16, 2009 7:33 PM
Subject: Water Pump Installation

> I've always thought (and used the approach) that the big O-Ring is the
> only seal required on an I-5 waterpump.  I'm doing the timing belt on my
> 200q20v avant, and when I took off the old pump, there was a bunch of
> black gunk all over the surface surrounding the hole.  After repeated
> scrubbings with brake cleaner and a brass brush, I've got all the black
> gunk off, and I find there are several grooves where the old pump sort
> of corroded to the block, I think.  This is only the second belt
> replacement, according to the records I got with the car, now at about
> 130K miles.  I used some fine sandpaper and a sanding block to clean the
> surface after getting the black crap off.   I can see the grooves still,
> but they're fairly smooth.  I don't think I could get anything like JB
> Weld to stick in them enough that the surface would be smoother after
> additional sanding.
> Anyway, the directions for "mounting" the new pump say to remove all
> traces of old sealant and apply "sealing compound--Curil--between the
> sealing surface and the new pump".  They also supply the O-Ring, of
> course.
> Because of the non-totally-smooth condition of this block, I'm tempted
> to use a sealant.  Never seen Curil before.  Any suggested alternatives
> I'm likely to find in a rural FLAPS?
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