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Old 04-05-2016, 03:45 PM   #1
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Volvo Penta MS3C gear hesitates.

I wanted to post this in case someone else has the same problem I had with my Volvo Penta MS3C reverse gear.

My SB transmission was shifted at high RPM and glazed the clutch cone. How this happened is another story.

Anyway for some time now when shifted into forward my SB transmission would delay for about 10 seconds and then start turning the prop.

I read several online marine forum threads that seemed to indicate that the transmission could be taken apart and the clutch cone de-glazed with valve grinding compound. I watched several You-tube videos for this problem with outdrives and my gear. Volvo outdrives are very similar to my gear.

Last Friday I removed the reverse gear, took it apart and lapped the sliding sleeve cones in the gear cones with valve grinding paste and put the transmission back together and it worked. The delay is gone and the transmission shifts instantly.

The job is formidable because the transmission is heavy. The good thing is most of the parts came apart as assemblies. There were shims everywhere to keep track of.

The takaway here is that if your old mecanical Volvo Penta reverse gear is delaying going ito gear the problem is most likely glazed clutch cones and the repair is not as difficult as most might think.
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Old 04-15-2016, 05:30 AM   #2
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Well done, and thank you for the tip.
I myself has a cone clutch gear from Volvo Penta, mine Works fine after 42 years marine age,5.200 Work hours.
Once I put the forward gear in with too higth rpm. 1500 revs. and I had a hard time to get it in neutral, (do it before docking,else..you,re in trouble.)
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Old 02-01-2019, 12:25 AM   #3
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Quote:
Originally Posted by obthomas View Post
I wanted to post this in case someone else has the same problem I had with my Volvo Penta MS3C reverse gear.

My SB transmission was shifted at high RPM and glazed the clutch cone. How this happened is another story.

Anyway for some time now when shifted into forward my SB transmission would delay for about 10 seconds and then start turning the prop.

I read several online marine forum threads that seemed to indicate that the transmission could be taken apart and the clutch cone de-glazed with valve grinding compound. I watched several You-tube videos for this problem with outdrives and my gear. Volvo outdrives are very similar to my gear.

Last Friday I removed the reverse gear, took it apart and lapped the sliding sleeve cones in the gear cones with valve grinding paste and put the transmission back together and it worked. The delay is gone and the transmission shifts instantly.

The job is formidable because the transmission is heavy. The good thing is most of the parts came apart as assemblies. There were shims everywhere to keep track of.

The takaway here is that if your old mecanical Volvo Penta reverse gear is delaying going ito gear the problem is most likely glazed clutch cones and the repair is not as difficult as most might think.


I have the same model gearbox and I’m experiencing delays in reverse and sometimes forward. Did you remove the transmission from the boat or do it in place? Which part is the clutch cone on the exploded view?

Thanks John Click image for larger version

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