One more thing to add here....

do not EVER, EVER use 2 cycle or any other petrolium
based oil on a water pump impeller. This will
destroy the rubber in no time.

The principle to "pre-lub" the impeller is right
on the money though.

When I replace the water pump impellers I use
a water based lubricant. (KY Jelly)
(made by wife go to the store to pick that one
up!!! LOL)

Tom

none wrote:
wrote in message
...
I have a 1979 115hp Evinrude outboard. We're
trying to change the impeller. We removed a
bolt which held the top of a shaft in a bracket
in the top part of the motor, then removed 5
bolts from the lower end and tried to drop it down,
but it is stuck somehow. Can anyone offer any
advice on this, and/or know of a place online
where there's a diagram or explanation of how
to change an impeller?

Thank you for any help!
David

Get a service manual for the engine. There is an entire procedure to
follow,
including the proper torque specifications for mounting the new or
old water
pump. Too much pressure will either break the housing or cause
premature
wear and/or failure of the pump. And as Don stated, there are many
more
items to consider, including using 2-stroke oil or similar when
installing
the impeller in the housing.

Your service manual should also show you the signs of wear in the
impeller
and other related fixtures including the housing.