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BMW sterndrive

Has anyone in the group had experience with a rattling BMW MKII sterndrive unit or an early Volvo which is similar. Mine rattles loudly after a run on the plane when you come down to idle speed. It wont rattle in neutral till you get the revs up to about 1800 then the rattle comes back.

It has no decernable rattle under load, just idle after a planing run. The unis and gimbal bearing have already been replaced. When I dont use the boat a few days and start up it is quiet at first, but always comes back.

Anyone?

Thanks Cam

Grant
Feb 20
Most marinized engines use a regular flywheel. A flexplate is typically used with an automatic trnsmission and in that case the torque converter acts as the flywheel weight. James
Feb 21
A flex plate can do that. Might be worth checking.

Dan

Danlw
Feb 19
I was thinking the same thing, But I wonder if the engine actually has a flex plate (like an automatic trans) or if the ring gear or is pressed on the flywheel (like a manual shift)? Tim
Feb 19
   

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