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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  #1  
Old 10-26-2010
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Volvo MSB reverse gear

Hi All.

I am new to this forum but not to boats/Diesels. I have a boat with Volvo MD17C and Variable pitch prop. The shaft is screwed directly into the end of the direction slide mechanism and then the gearbox. No flexible coupling.

I want to change the prop shaft and put in a fixed prop and shaft.

Question:
The gearbox has a stop on the reverse gear direction so it cannot be used. (It would unwind the shaft and all the wrong issues would ensue). Does anyone know these boxes well enough to tell me if it should work in reverse if I remove the stop? I tried once and nothing happened. Could this just be gunk on the clutch? ( I live in hope as the alternatives are out of my budget).

Fingers crossed
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Old 10-26-2010
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did you try rotating the shaft a bit one way or the other when trying to slip it in reverse? My guess is that the sliding cone clutch has worn the portion of the shaft between neutral and forward and that the shaft splines probably have a bit of a "step" to the transition to reverse.
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Old 11-05-2010
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Thanks ERPS.

I got it into gear OK but it didn't rotate the shaft. Could there be gunk on the clutch perhaps?

I will give it another try tomorrow and let you know how it goes,

Thanks again for your reply.
Greg
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Old 11-05-2010
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Hi Again.

I got the gearbox into gear but no rotation. Any ideas? Could there be a gear sproket missing?

I will have to look for a used gearbox and hope it is ok. I have not seen many advertised. I suspect most people assume that it is too old to bother with and throw into the land fill.

Fingers crossed..
Greg.
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Old 11-05-2010
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Total guess here but a 'missing gear' is likely - and the main preventative measure to inadvertant reversal. The stop was probably to give the solid stop on the linkage.
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