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2010 Honda BF90 rusty flywheel

M

MGCGF

New member
I had the starter on my Honda BF90 replaced because the bendix would spin but not engage. The boat sat for 4 months over the winter. The new starter was used one time and I had the same problem. I called the repair shop and they said I only had a 90 day warranty. I pulled the starter off. The flywheel and new starter bendix have lots of rust. It seems to me that water is getting in there somehow. I can find limited information on this issue. Any thoughts of what to look for next?
 
There are several ways water can get into the flywheel cavity.

The motor could have gone under water.

If the motor is rigged so that it is too low, water pressure could drive water through the shift shaft seal, while under way.

If in salt water, one or more of the core plugs in the bottom of the block could have rusted and is leaking water into the cavity.

If the boat is kept in the water with the motor tilted all the way down, it is possible that waves could force water under the engine cowling and the water eventually finds its way down into the flywheel cavity. You usually see evidence of mud or debris under the hood.

Of course, a lower casing seal, power head gasket, or seals associated with the water tube could have gone bad, allowing water to come up the vertical shaft.

You can try to take a bore scope into the starter opening to see if you can see anything obvious.

If you see no external evidence, then the only way to check for sure is to pull the powerhead and visually inspect.

As I am sure you know by now...the flywheel cavity should have no water or oil in it.

Good luck on your search.

Mike
 
Mike,

Thank you for your information. I had someone look at it and it looks like the shaft seal is the issue. Thanks again for the info.
 
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