Volvo Penta Sterndrive 'Jumps' When Selecting Reverse

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The most common reason that Volvo Penta drives 'jump' when selecting reverse is often because the reverse lock pawls and mechanism are not free to move on the steering tube,-

This is how the mechanism works: when in reverse the mechanism hooks over the locking pin by the springs, but when forward is selected the pawls are pushed up out of the way to allow the leg to kick up if it hits anything, but the mechanism must always remain in a fore- and aft position in relation to the transom shield so that it can pick up and engage the pin when needed.

T alll times the drive must be free to revolve around the mechanism, but over time due to the alloy on the aluminium oxidisation, marine growth forming and seals breaking, down the mechanism starts to 'stick' on the steering tube and trys to turn with the drive rather than staying in position.

The correct way to fix this is to remove the drive and the upper and lower gear housings then press out the steering tube from the intermediate housing, strip and clean the mechanism, and re-assemble using new spacers, bearings and seals, also ensuring that all the faces on the housing are cleaned, treated, repainted with Volvo Penata Paint  and greased with Marine Grease

 

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