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Topic: ‘59 Scott-Atwater 7.5
Hello, I’ve recently purchased a 59 Scott Atwater 7.5. Didn’t take very long to get it running although I noticed right away it was not cooling… I ordered 1 19210-zw9-013 Honda Six fin impeller and replaced only the lower cooling impeller as well as the 3 O Rings for the pump housing and still nothing. Do I need to replace the bailer impeller as well? I seen somewhere someone had mentioned the bailer impeller kind of acts as a seal for the lower cooling impeller? Am I missing something here ?? Cooper pickup tube is clear and seated correctly into lower pump housing also. Also it came with about a 3 inch binder service manual although the 4 or 5 pages on the water pump have been torn out ! Any help or tips would be greatly appreciated.
Here’s some notes from others, I had saved in my files———
—————–
I would like to know where to get impellers also for a 7.5hp bailamatic.
I have used a honda impeller part number 19210-ZW9-013 I had to shim the
housing with 1/16 inch stainless and also shim the impeller to the shaft.
I am getting ready to fix a Firestone that was made by Scott I believe and
it would be nice to purchase the impellers if someone knows where to get them?
I only shimmed the top impeller using a honda impeller on the engine I re-did
since the lower one runs the bailamatic I didn’t re-do it. You can see it
run here. I did send an email to flying scott but didn’t get a response.
Thanks for the help.Joe
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Re: Scott 10 hp where is water pump
Postby Mumbles » Tue Jul 05, 2016 9:34 pmcannuck wrote:
Is it necessary to replace both .Not unless you want to use the bailer option.
I think some guys have tried it by removing the one
impeller but for this ’56 7.5, I made up an aluminum
hockey puck to fill the bailer impeller cavity and plugged
all of the unnecessary holes. Now it runs cool and pumps
like a fire truck.
=================
I ran across this inexpensive, readily available Honda impeller
that is supposed to fit the Scott Atwater Bail-A-Matic 7.5hp.
Just passing along the info. Curious to find out if it works:Honda 4-stroke 8hp 9.9hp BF8D BF9.9D
19210-ZW9-013
Number of Blades: 6
Plastic Hub
Height: 14.77mm
External Impeller Overall Diameter: 45.04mm
Internal Shaft Insert Diameter: 13.35mm
==============
Ron Hawkins used Honda 19210-zw0003 impeller
Ron Hawkins I just removed the original liner
and the modified the inlet and outlet holes on
the 9.9 Honda liner and epoxied it into the S/A housing.
===============
Ron Prochaska
Author
Tony C Zamp only problem I’ve had so far on the 5th dry
start the factory drive pin is too small. It slipped.
I used a 6/32 stainless bolt and enlarged the slot on the
impeller. Had 3 more dry starts no issues I’m torturing
this to see how well it will handle the housing being up
so high. So far this is better than old nos impellers I’ve
tried in the past. I have not wet them before starting once.
I’m sure if you wet before starting you will have no problems
ever. As if now I’m ready to put it on my boat
=================
Jason Pickerell
I don’t understand how that impeller works by itself, but it
seems to, and many people have said that they did the swap.
When I mocked it up in the housing on my engine, the height
was great, but when I lined up the center bore of the impeller
with the center of the hole through the housing, the blade tips
didn’t quite touch the vacuum side of the housing. Maybe it’s
working good enough as a slosh pump on that side IDK.
I wound up epoxying the liner from the Honda inside the Scott
Atwater housing and die grinding holes in it. Once assembled,
and run, the tell tale stream was like a water jet!
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Ron Prochaska been there done that honda thing.. Works great
if you can add .064 to the ID of the housing and polish the
bottom..you remove the incert then turn a aluminum ring to
id .064 od to fit the housing… Bingo the small honda will do
it but it took me one whole winter to convert the damn thing
way back when
==================Prepare to be boarded!
According to my notes, I ended up using Honda impellers in the two 7.5 hp bail-a-matics
I worked on. I blanked the bailer pump, and just used one impeller in each motor.
I tried other impellers as well that some people said worked, but not for me.
The part number I show was…….. 19210-ZW9-013Some people epoxied a Honda liner into the Scott pump housing, but I was not
able to find where anyone sold “just” the liner, so I added brass sheet
on the walls of the original liner to reduce it’s diameter, so the Honda impeller would pump
nicely.My notes……
Installed a .035 brass liner inside of the
current water pump liner to use the Honda impeller,
and made a new brass cover plate on pump.
Pump cavity ID was originally 1.685, depth .600
Pump cavity ID with brass insert is 1.632,
.053 smaller than original.
Honda impeller specs – OD 1.785 x .585Prepare to be boarded!
Update…water pump mod works great. Again, the part number is as follows.
Honda BF8D part #19210-ZW9-013
Wayne
Upper Canada Chapteruccaomci.com
So after some experimenting with impellers I have found what I think is an affordable solution that should be available for awhile. The impeller fits perfectly with the exception of the ID. The Oliver driveshaft is only 9/16”, which makes it the same as the KE7 not the KG7 as I originally reported. The hub material is hard plastic and is easy to file or machine to the correct diameter. I will likely switch the impeller key to an OMC style instead of the original pin style.
Honda BF8D part #19210-ZW9-013
For those of you interested in the details of this saga, I first attempted to find another useable impeller from the parts bin. I found that the Martin 100 impeller fits the driveshaft and housing perfectly, but would need some modification to the driveshaft as the key is different. This was never really a viable future solution since I can’t go to the Martin dealer down the street whenever I need another. The same can be said for the Mercury KE4/KE7/Mk7 impeller. The Scott-Atwater 7.5-10 hp impeller fit except for the ID. Knowing that the Honda impeller is a suitable replacement for the SA I chose to pursue it. It is not a perfect solution, but at $32 CAD it is more affordable than the specialty store options that run $50-70 USD plus shipping.
Wayne
Upper Canada Chapteruccaomci.com
