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Old 31-05-2012, 18:42   #16
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Re: Yanmar Down on Revs

I had a similar problem recently, full revs out of gear but 2900 in gear. We have a 4JH2E, so 50 horse and no turbo but something so simple to check. We hadn't been out much thru the winter months and had some growth on the prop----cleaned it up and now get 3700RPM in gear. It was quite amazing. Jim
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Old 01-06-2012, 15:13   #17
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Re: Yanmar Down on Revs

Similar problem with our new boat; revs fine out of gear but a bit slow forward. Turns out we bought a boat with hardly any oil in the Borg Warner.
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Old 02-06-2012, 15:01   #18
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Re: Yanmar Down on Revs

We had the same problem with our 4JH turbo last summer. However, we got black smoke at higher rpms. Turbo was totally clogged up. Removed, disassembled and cleaned (at the suggestion of folks on a VW forum with the same turbo, I used EZ Off oven cleaner - the nasty stuff, not the friendly stuff). We now try and clean the turbo regularly with turbo wash. Smelling it, I'd swear it's the same stuff as Fantastik cleaner - but I wouldn't use it instead.

I'd suspect a dirty turbo.
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Old 02-06-2012, 15:12   #19
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Re: Yanmar Down on Revs

Mine did that after I put a Biocide in the tank and sailed to Hawaii. It apparently killed all the little devils but the agitation of the sail plugged up the filter. Had to R&R the Racor 500 and clean it out with a toothbrush and Q tips. Fuel in the bowl had the consistancy of pudding.
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Old 02-06-2012, 16:14   #20
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Re: Yanmar Down on Revs

Quote:
Originally Posted by roverhi View Post
Mine did that after I put a Biocide in the tank and sailed to Hawaii. It apparently killed all the little devils but the agitation of the sail plugged up the filter. Had to R&R the Racor 500 and clean it out with a toothbrush and Q tips. Fuel in the bowl had the consistancy of pudding.
I have dual Racors with clear bowls -- look fine. But just in case I'll switch to the other one -- thanks for the tip.
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Old 03-06-2012, 05:38   #21
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Re: Yanmar Down on Revs

Are you sure it isn't a linkage problem? Have you tried to move the throttle arm at the engine to the full stop and see what happens?
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