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Old 25-07-2019, 23:31   #1
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Join Date: Sep 2010
Location: Currently cruising the Philippines, just got back from PNG & Solomons
Boat: Wauquiez 45' (now 48') catamaran
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Yanmar SD31 dog-clutch slipping?

Over the last several months, I've noticed a significant clunk from my port Yanmar SD31 saildrive when I back down to set the anchor. No problem in forward, just reverse.

I suspect that I've rounded off the ears on the reverse (upper) side of the dog-clutch. Has anyone else experienced this?

According to my manual, replacing the reverse side is much easier than the forward side, as I only have to remove the shifter (on the side of the SD) & the top of the SD, & then drift the gear (& bearing) out with a stick through the shift hole.

Has anyone else done this? Are there gotchas I should look out for?

The (horizontal) input shaft from the engine ends in a crown-gear. The top of the (vertical) driveshaft has 2 crown-gears (fwd & reverse) that are mated to the input-shaft gear & are always spinning (in opposite directions) when the engine is on. The dog-clutch is splined to the (vertical) driveshaft, & engages either the top (reverse) or bottom (fwd) crown-gears, thereby connecting the engine to the driveshaft.

The dog-clutch itself is relatively cheap ($95 at Toad Marine) but the 2 crown-gears (which show in my parts manual as: "upper gear assembly" even though they're just gears) list at over $1,100 EACH!

If the dog-clutch is slipping, should I also replace that reversing crown-gear?

Has anyone bought one of these "upper gear assemblies"? Is it more than just a gear?

Finally, what should I do to make sure this doesn't happen again? The shifter *seems* to be shifting all the way over.

TIA
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