Home › Forum › Ask A Member › 1956 Scott Atwater 7.5 hp Bail-a-matic impeller install › Reply To: 1956 Scott Atwater 7.5 hp Bail-a-matic impeller install
It’s been a learning experience about outboard water pumps.
I’ve seen pump liners in worse shape than the one on this
Scott, and work just fine, but then again, the pumps were
a lot closer to the water level, or actually below, where
they should be!
Therefore, I’ve concluded that if you want your Scott Bailer
to pump water, the pump liner better be in good shape!
I also concluded if you’re using Honda impeller
19210-ZW9-013 19210-ZW9-003 18-3100 for Honda 4-Stroke Outboard Motors
You’ll also need to reduce the inside pump cavity diameter by at least
.070 for the impeller to work.
I made a new top plate for the water pump housing out of brass plate.
Took a while with a hacksaw, belt sand, files, and various bits
in the Dremel. Then lapped the plate nice and smooth and level
on the pump side.
The pump will now take suction at normal operating level above the
water, around a foot up, with the drill operating mid range in speed.
Also note that the pump no longer blows water out around the top cover where
the driveshaft goes through.
It could possibly even pump better if my new O-rings for the pump housing
ever show up. Guess I’ll work on Scott bailer #2 while I await the O-rings.
No guess on the longevity of the brass in the pump vs. the original
stainless steel.
Prepare to be boarded!