What Johnson manual says to lube up the rubber impeller with
oil based lubricant? What about the johnson impeller kits?
The only lube the put in there is for the top of the lower
unit to connect to the engine. If you think manufacturers
over engineer products just for the hell of it, you are
mistaken. Technically you probably dont even need
to lube it up in the first place. When submerged in the
water the impeller is underwater. When connected to muffs,
water is being forced in. Sort of explains why OMC or Bomb.
doesnt include it in the kits.

In any case, certain types of rubber dont do well when exposed
to oil. I am not saying its going to fall apart immediately, BUT
lets say I change mine now. Ok so I put it together and put it on
the boat. I can't start my boat for the next 2 months (winter) So all
that time the oil can just sit and soften up the rubber.
What happens over time?? Nothing much... just premature failure.

I guess that is good for the shops. Blown powerheads make LOTS of
money.

Just because you and possibly other shops do it doesnt make it right.
In addition to this, I can't say what Merc, Honda, or any other brands
suggest what to use.

I DO know that there are different types of rubber used for different
applications. Just because its rubber doesnt mean that safe to use
with petrolium.

There has been lots of discussion about what to use in previous posts.
Check it out.

Tom


none wrote:
Sheep ****e. This is SOP in most shops and in many service manuals I
have
read this is SOP. I have NEVER seen an impeller fail from petroleum
based
oil products. That's just silly. I've done this for many years and
with
every kind of engine, make, model you can imagine and what you
describe has
never been a problem.



"Sexytom976" wrote in message
oups.com...
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.