RE: Jackshafts & Water Pumps

[Richard Hudson <richard.hudson@domain.elided>]

Hi Daryl

Two things that I think may have caused this problem.

1st the water pump cover could have been refitted without sufficient
clearance between the cover and the bolt on the water pump. This would
cause the pump to bind and subsequently wear out the gears.

2nd could be that you had a brand new water pump fitted.. There are,
apparently, a number kicking around that did not have proper case
hardening on the jackshalf gear. These water pumps, apparently, tended
to last 2-3000miles before failing. 

You hopefully will appreciate that you will need to strip the engine
down and remove all swarf from the oil-ways and inspect for damage to
bores and bearings.. Did a pro build the engine for you? If so you may
be able to "persuade" them to do the job again for nothing. 

If you did the job yourself then I suggest you get the case hardening
checked on the water pump gear, then you may have some comeback on the
guys who supplied you with the water pump.

I am not a victim of this particular problem, but there are a number of
owners especially in the UK who have successfully taken action against
Unipart who, allegedly, supplied the rogue parts..

Maybe someone else in the group can advise on testing the hardening on
the waterpump gear.

Good luck and regards

Richard Hudson
73 Auto White Stag

	-----Original Message-----
	From:	Daryl Gatenby [SMTP:Daryl.Gatenby@domain.elided]
	Sent:	25 September 1998 01:44
	To:	'stag-digest@domain.elided'
	Subject:	Jackshafts & Water Pumps

	Recently I had the less than agreeable experience of watching
the Stag's
	temperature guage climb close to the red sector. Inspection of
the cooling
	system showed that the water pump was not operating. Upon
withdrawing the
	water pump I noticed that the teeth on the drive gear were
somewhat smaller
	in dimension to what they should be. They also sported blue
heatmarks and
	were razor sharp at their tips. It seems to me that they were
subjected to
	inadequate lubrication. Of note also is that the corresponding
drive gear on
	the Jackshaft was in a similar condition. Considering that the
engine was
	re-built only 5000KM ago I find this situation slightly odd. I
have not
	withdrawn the Jackshaft from its normal place of operation as
yet so cannot
	provide ID and OD measurements of the block and J/S
respectively.

	Questions:

	What has most likely led to inadequate lubrication of the said
parts (oil
	pressure is fine)?

	What is required to remedy the problem to a point where the next
new J/S and
	W/P will not suffer the same fate.   

	Your opinions and experiences are most welcome.

	Daryl Gatenby
	Hamilton
	New Zealand
	73 Stag MOD
	daryl.gatenby@domain.elided