On Tue, 23 Dec 2008 17:14:17 +0100, "Edgar"
wrote:


"C. S." wrote in message
...
BUT. It only solves a minor part of the problem. My experience is that
the
two big problems are getting the old impeller out and the new one in,
preferably with the wings in the right direction. The Speedseal page
mentions an impeller removal tool but does not show a picture. Does
anybody know what it looks like, how it works and is it useful also in
really tight spots?

Caitzu

Screwdriver has always worked for me. Used carefully you do not damage the
impeller


Damaging the impeller with a screwdriver is not the issue, damaging
the machined mating surface under the cover plate is the real problem
when you try to pry it out.

I've had much better luck with two pairs of needle nose pliers,
grabbing vanes on opposite sides and giving it a straight pull out. A
little shot of PB Blaster on the shaft hub can help if it is really
stuck.

There is a trick to getting the new impeller back in. Wrap a nylon
wire tie around the new impeller, compressing the rubber vanes around
the hub as you tighten it up. That should allow you to get it
started, and then you snip the wire tie with cutters and push the
impeller in all the way. It does not matter if the vanes are pointing
the wrong way - they will flip over on the first turn. A light shot
of silicone spray will ease the process.

It is much better for the engine to replace impellers on a regular
schedule of preventive maintenance rather than waiting for them to
wear out. In addition to preventing a potential overheat, impellers
shed vanes when they wear out, and the loose vanes get stuck elsewhere
in the cooling system.