GM water pump

[Don.F.Broadus at ucm.com]

I have read that it is easy to crack the ceramic seal in these pump if the
fill isn't correct. If you have air pockets or start the vehicle before you
add water the seal could crack due to heat and cause your leaking problem.

	-----Original Message-----
	From:	Martin Powlette [SMTP:marquise at candw.lc]
	Sent:	Monday, October 05, 1998 1:17 PM
	To:	diy_efi at efi332.eng.ohio-state.edu; toyota-mods at cyberauto.com
	Subject:	GM water pump

	NON GROUP CONTENT
	I posted a message on a water pump problem I had been having with a
	small block V8 engine.  The engine had gone through about 3 pumps in
one
	9 months and now with my own experience 2 pumps in three weeks the
last
	started leaking in 2 days.  The last 2 pumps were genuine AC Delco.
The
	pump leaks through the hole in the bottom.  There was a bit of
	eccentricity after the first pump that I corrected with a new hub
and
	fan clutch, the fan seems balanced. I was really dissapointed in the
	feed back from you guys the last time so you V8 guys please chip in.
	The one observation I made is that the intake manifold was once
removed
	could a badly installed intake gasket be the problem??. The gasket
	according to Haynes Manual has a block on the rear coolant passages,
	what if it was removed or placed to the front passage instead???
	We can't always get Toyotas to work on every day. Please help.

	Martin