[Vwdiesel] Cracked Block? (fwd)

[Val Christian]

Nate,

No sign of cracking there.  I'm not sure that those bolts go into the coolant
passages.  They look absolutely like they're brand new.  No cracking whatsoever
under and around the pump.  I checked it carefully while the pump housing was
off.  Besides, that area remains dry, even though fluid leaks elsewhere.

Thanks for the idea, though.

Val


>
> 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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