Message-ID: <200308050721340570.0008C596@smtp.ttc-cmc.net>
In-Reply-To: <list-2511662@logan.com>
References: <list-2511662@logan.com>
Date: Tue, 05 Aug 2003 07:21:34 -0600
From: "Stone Tool" <owly@ttc-cmc.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Oshkosh Grumps
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Perry:
	The water pump bearings are a surface to surface seal with a spring loaded=
 neoprene piece that turns against a ceramic wear surface.  Leakage in=
 these seals is not uncommon, and does not necessarily indicate any real=
 problem.   A bit of build up of engine sludge or a bit of grit will make=
 them seep slightly.  This does not indicate a problem with the bearing,=
 and often does not even indicate a real problem with the seal.    I have=
 seen the telltale drop of coolant on virtually new pumps.   It is not a=
 warning of impending failure..... if your pump is not old, don't worry too=
 much about it.

							H.W.


*********** REPLY SEPARATOR  ***********

On 8/4/03 at 9:07 PM Perry Mick wrote:

>Tracy Crook wrote:
>
> >Saw the first sign of waterpump failure on the engine.  Noticed a drop=
 of
> >coolant hanging from the pump pulley every morning when I took the 
>cowl off
> >to begin another day of talking airplanes & engines.  No noticable play
>in
> >the pump bearings and I noticed no drop in coolant pressure on the way 
>home
> >but a new pump is definitely in order.  This was the original pump I got
> >with the 1988 13B engine I bought back in 1992.
> >
> >
> >Tracy Crook
> >
> >
>The water pumps went out in my '86 plane and my '86 car two years ago,
>so it is about right that your '88 water pump should be failing now.
>They last exactly 15 years :)
>
>-- 
>Perry Mick
>http://www.ductedfan.com
>
>
>
>
>
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