[Vwdiesel] Cracked Block? (fwd)

[Nate Wall]

The A/C beacket shares the same holes and bolts as the pump housing. I wonder if
its possible it was overtightened and caused the block to crack. I hope this is
not the case, though.

--nate

Val Christian wrote:

> Gary,
>
> I replaced the pump and housing, and was careful to clean off the crankcase
> at the pumphousing seal point (with a razor).  Then I was careful in seating
> the o-ring on the pump housing to block interface.
>
> It wasn't mentioned in my first posting, but this situation was preceeded
> by a thermostat failure.  The plate on the thermostat, which stops
> recirculation of the cylinder head water through the block, therefore
> forcing circulation through the radiator, failed.  Or rather the riveted
> shaft holding it on failed.  After 2 years of use.  Stadt brand thermostat.
> I was concerned that something may have caused the housing to crack.
> Instead, what I think happened was that the waterpump was drawing against
> a flow obscured by the plate nearly blocking the port to the impeller area.
> Therefore, I elected to get a pump with housing, and go through the
> additional disassembly.
>
> The temperature gauge never made it to the top of the scale, but there
> was loss of coolant the next day when I examined things in daylight.
>
> Val
>
> Forwarded message:
> > From: "Gary, Orlando" <gbangs at cfl.rr.com>
> >
> > Val,
> > Did you replace just the pump or the whole water pump assy?
> >
> > I ask because there is no water jacket between the pump itself and the
> > crank. The water actually flows up through part of the housing to a
> > point on the block just above the intermediate shaft. It seals there
> > with an o-ring.
> >
> > Perhaps this seal is leaking or the housing has a crack.
> >
> > -Gary, Orlando
> >
> >
> > On Sat, 2002-12-21 at 11:49, Val Christian wrote:
> > > I have a 91 Jetta 1.6, with a coolant leak in the vicinity of the water
> > > pump and the crankshaft.  I replaced the waterpump based upon the
> > > mileage it had been in there (175k miles), but found that the old
> > > pump appeared to be just fine.  With everything back together,
> > > coolant poured into the engine, comes out near the area between the
> > > waterpump and the crankshaft.
> > >
> > > There is no oil to coolant nor coolant to oil contamination, nor is
> > > there any sign of burning coolant.  The head gasket seems just fine,
> > > although I can't completely inspect the perimeter near the timing belt
> > > area.
> > >
> > > At the time I replaced the water pump, I elected to also replace the
> > > timing belt.  I looked for water leaks, and found none.  However, in
> > > retrospect, there was warpage of the lower timing belt cover.  Perhaps
> > > where the leak may be.
> > >
> > > Has anyone seen a block crack such as this?  Any insight or ideas to
> > > share?
> > >
> > >
> > > Thanks.
> > >
> >
>
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