flushing long shaft outboard tilted

Jul 20, 2011
176
1974 Macgregor 22 SoCal - dry storage
have a Macgregor 22 with a tohatsu 6hp sailpro that has a flushing port. boat is in a slip. With the motor bracket in the up position the impeller water intake is below water, so when I flush the motor, I have to tilt it, any problem with this? It does run while tilted, just seems unconventional and not sure if the engine oil gets picked up. I like to run the carb empty while flushing, so not sure if this can be achieved if tilted.

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jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
23,659
CAL 35 Cruiser #21 moored EVERETT WA
My neighbor had a small Honda, which he would attach a hose to the shaft where the water intake was. He turned on the water, and it flushed the water lines with fresh water. He would run the fuel out of the carburetor at the same time till the engine died. I am guessing that if you had a way of running fresh water into the shaft, it could sit in the water while the engine ran (no tilt). Then you could apply the tilt and turn off the hose.

Something like this.
seneca-marine-outboard-motor-flush-kit-flusher-muffs-fresh-water-hose-attachment-for-yamaha-mercury-mercruiser-evinrude-honda-suzuki-johnson-smp-obflsh-01
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Likes: Richard19068
Jun 11, 2004
1,829
Oday 31 Redondo Beach
Oct 10, 2009
1,061
Catalina 27 3657 Lake Monroe
I think muffs are difficult to use with such a small outboard. I'd opt for the flush kit. I had a Tohatsu 4hp for a decade and never flushed it, but that was freshwater. I did run it in a 55 gallon drum, which eventually I was advised by my family to get rid of because they said it looked like something a serial killer would keep in their backyard.
 
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Likes: jssailem
Jun 2, 2004
3,595
Hunter 23.5 Fort Walton Yacht Club, Florida
I think muffs are difficult to use with such a small outboard. I'd opt for the flush kit. I had a Tohatsu 4hp for a decade and never flushed it, but that was freshwater. I did run it in a 55 gallon drum, which eventually I was advised by my family to get rid of because they said it looked like something a serial killer would keep in their backyard.
That is exactly why you should have kept it.
 
Jun 14, 2010
2,398
Robertson & Caine 2017 Leopard 40 CT
Check your engine manual. I suspect it will say that you should NOT run the engine using the flush port. It lets some water trickle down to the impeller but it’s not drawing water from the bottom, therefore not enough water is running through the impeller to prime it and fully lubricate it. My local Yamaha dealer told me he replaces a lot of impellers due to people not reading. It flushes the engine from above.
Best thing to do is bag the lower unit with a black plastic trash bag and a bungee cord and run your flush without running the engine. Leave the bag in place between uses to prevent fouling if it sits in the water. Edit: It’s OK if water remains in the bag. The bag stops fouling and the lower unit would be wet anyway. The bag should be black.
 
Last edited:
Mar 20, 2015
3,284
C&C 30 Mk1 Winnipeg
I did run it in a 55 gallon drum, which eventually I was advised by my family to get rid of because they said it looked like something a serial killer would keep in their backyard.
One of the modern big wheeled recycling/garbage carts works well. I used it for our tohatsu sailpro ultra long shaft and now for our dinghy outboard.

Best part ? Supplied by the city, and no extra storage space required
 

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Likes: LLoyd B
Jun 2, 2004
3,595
Hunter 23.5 Fort Walton Yacht Club, Florida
The five-gallon bucket is my go-to for these situations

A better option if you have access to someone who is a swimming pool maintainer Chlorine tabs and other chemical also come in a larger / taller bucket. the taller one is nice because you can fill it up high enough to run the motor but it will still have enough free board that it floats.