Tim, When it "caught" was it more of a thunk or just slowly came up to speed?
I have not had a Yanmar aux in a boat for over 10 years but this sound more like an oil pressure or clutch belt issue than a propeller problem. Martin Calypso 1971 C&C 43 Seattle ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Tim Goodyear Sent: Wednesday, August 22, 2012 12:49 PM To: [email protected] Subject: Stus-List Transmission or Prop Issue? The last time out I noticed some strange behaviour when motoring. Basically, I got very little drive from the prop until I increased revs pretty substantially (around 2000rpm) and then it 'caught' and I got normal speed from the revs, and am able to throttle up or down appropriately. If I brought the throttle to idle (in gear) at speed, I would have to do the same thing to get it to 'catch' again. I didn't have time to do more diagnosis at the end of the trip, but will do so when I head to the boat this evening pre-race. Reverse worked fine backing out of the slip. I'm thinking either its a transmission problem, or the propellor (2-blade flex-o-fold) isn't opening when it should. I'm going to check the shaft speed in-gear at the dock, which should tell me which. If it turns out to be propellor, then I'll live with it until the end of the season; if it's the transmission, does anyone have ideas about where to go next? Gear oil was changed at the beginning of this season, so that shouldn't be the issue, but I'll check levels etc. The engine is a Yanmar 3GMF. Thanks, Tim Mojito C&C 35-3
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