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I've owned this motor since new, has about 250 hours on it, used in saltwater (FL) seasonally (winter), boat is kept on a lift during season and trailer dry-stored in off season. Motor is flushed with fresh water every use.
At the end of each season (i.e. spring) I have always changed the gearcase lube, and it has always been in excellent appearance - no evidence of leaks. I always use a new Yamaha washer when reinstalling the plugs, and tighten with a wrench on the screwdriver. When I last drained it (March, 2020) there was quite a bit of water in the fluid drained. Possible causes I can think of: (i) a slight irregularity in one of the drainplug washers might have caused a leak; (ii) a relatively low speed soft bottom grounding (skeg and prop contacted sand bottom at about 10 mph but no obvious damage other than paint scraped off); and (iii) it has been a few years since I removed the prop so possibly there is some issue there, although visually looks OK.
What is recommended to address this issue? Pressure test of gearcase?
I need to change the impeller so will perform recommended gearcase leak detection procedures before using the boat again upcoming winter season.
At the end of each season (i.e. spring) I have always changed the gearcase lube, and it has always been in excellent appearance - no evidence of leaks. I always use a new Yamaha washer when reinstalling the plugs, and tighten with a wrench on the screwdriver. When I last drained it (March, 2020) there was quite a bit of water in the fluid drained. Possible causes I can think of: (i) a slight irregularity in one of the drainplug washers might have caused a leak; (ii) a relatively low speed soft bottom grounding (skeg and prop contacted sand bottom at about 10 mph but no obvious damage other than paint scraped off); and (iii) it has been a few years since I removed the prop so possibly there is some issue there, although visually looks OK.
What is recommended to address this issue? Pressure test of gearcase?
I need to change the impeller so will perform recommended gearcase leak detection procedures before using the boat again upcoming winter season.
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