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Volvo penta md2b

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dean72
New member
Username: dean72

Post Number: 2
Registered: 07-2014
Posted on Monday, July 14, 2014 - 12:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

hi can anyone tell me if i can use an aquadrive with my md2b with the ms box or does it need the thrust of the prop to keep it in gear like rb box
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adsum
Advanced Member
Username: adsum

Post Number: 40
Registered: 01-2008
Posted on Wednesday, July 16, 2014 - 03:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

We have a custom made antivibration coupling on the propeller shaft of a MD2B with RB box. This coupling is made of two flanges and conical antivibration mounts (rubber). It is attached because the engine ran out of gear due to the thrust of the propeller. It works great for more than 30 years.
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dean72
New member
Username: dean72

Post Number: 3
Registered: 07-2014
Posted on Wednesday, July 16, 2014 - 04:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

do you have a picture of that when you say it ran out of gear what exactly do you mean
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adsum
Advanced Member
Username: adsum

Post Number: 41
Registered: 01-2008
Posted on Wednesday, July 16, 2014 - 05:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

While sailing ahead with the gearbox in forward the gearbox sometimes spontaneously shifted into neutral. According to my late father in law the thrust of the propeller caused that fenomena. What I have understood is that it had something to do with a recoil force in the gearbox. Thatís why he placed a self made flexible propeller shaft coupling. It absorbs the driveline vibrations but is still rigid enough to transmit the (damped) propeller thrust to the RB-reverse gearbox that needs the thrust for good functioning. The undesirable shifting was over after this improvement. I made some pictures tonight.
flexcoup1flexcoup2flexcoup3
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dean72
Member
Username: dean72

Post Number: 4
Registered: 07-2014
Posted on Thursday, July 17, 2014 - 05:30 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks for posting, very interesting.

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