Author Topic: Vibration in reverse gear  (Read 2494 times)

Cabtrack

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Vibration in reverse gear
« on: October 04 2020, 22:33 »
I have a vibration in reverse gear. In neutral forward and reverse increasing revs, no vibration. No vibration in forward gear. Any thoughts. Time motor is a Volvo MD2020 and a 130s sail drive with 3 blade folding prop.

PEA-JAY

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Re: Vibration in reverse gear
« Reply #1 on: October 05 2020, 06:47 »
Did this just happen suddenly?
Have you just done some work on the sail drive and this vibration started?
Have you hit something or caught a rope?

Yngmar

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Re: Vibration in reverse gear
« Reply #2 on: October 05 2020, 11:24 »
The most likely culprit is the folding propeller. Hop in the water and check for fouling growth and stuck debris.
(formerly) Sailing Songbird  ⛵️ Bavaria 40 Ocean (2001)

Cabtrack

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Re: Vibration in reverse gear
« Reply #3 on: October 06 2020, 10:09 »
Hi Pea-Jay I recently changed out the rubber diaphragms on the sail drive.

PEA-JAY

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Re: Vibration in reverse gear
« Reply #4 on: October 06 2020, 11:01 »
If this problem happened soon after the diaphragm job make sure you reassembled the bearing housing in the drive unit using 8 x 25 bolts VP ref 946541 and not slightly longer ones

If you inadvertently used longer ones they will bottom in the threaded holes and you will think that they are fully tightened. On engaging reverse the bearing housing will move away from the lower unit and you'll have play on the shaft.

Have you found any oil contamination from sea water ingress?
 

Cabtrack

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Re: Vibration in reverse gear
« Reply #5 on: October 06 2020, 11:11 »
I used all the bolts that came out, no new ones and the oil is perfect.

elias

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Re: Vibration in reverse gear
« Reply #6 on: October 06 2020, 14:25 »
Had same issue

Check post
Vibration while reversing - Volvo saidrive 120 - engine penta 55

Cabtrack

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Re: Vibration in reverse gear
« Reply #7 on: October 06 2020, 21:01 »
Hi Elias
          Thanks for the information and will just monitor the situation. You haven’t had any issues since?