Scott, can’t be certain about your
year model, but some of the older models water pump housing required that you
install a small thin gasket/washer around one of the long bolts that the water
pump gasket did not surround.
Apparently if you did not install this
washer, the pressure on the housing from tightening the nut on that bolt would
cause the housing to warp slightly and result in leaks.
Unfortunately I can’t remember
exactly which bolt it was – except it was one of the studs that stayed in
the block when you remove the pump and the standard water pump gasket did not
go around – presumably if you are not using a gasket (I use silicon sealant)
it shouldn’t matter.
That’s all I can think of for you to
check.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Scott
Sent: Thursday, November 12, 2009
9:52 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Leaky Water
Pump Bolt
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I started filling the engine with coolant and as
soon as the level reached bolt #3 it started to weep. Pulling the pump
off the housing gave no indication of why the leakage. Per the haynes
manual the bolts were tightened in the specified sequence and to 20 ft lbs.
I did tighten to 25ft lbs, but it still continued to leak. Any
guidance on how much torque the threads on aluminum pump housing can take?
The drip rate is felt considerable as there was no pressure(
http://www.youtube.com/watch?v=2ImqWkP8sDw ) other than 1/4" of standing
fluid.
Any thoughts?
I am getting a new gasket and will try again of course.
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