Engine RATTLE fixed

[Tv]

I had a bad engine rattle and discoverd what seemd to be a loose flywheel.  Bob suggested I pull down the back end to check whic I did and I found the rivetts that attach the ring gear to the fly wheel were worn and ther was a lot of play between the the two
.
It's all back together now and nice and quiet - if that's possible for one of these bikes.

So if you have a bad engine rattle which is worse at idle (clangity clangity clang) and decreases when the revs go up to say 3K, to be on the safe side, turn the engine OFF, remove the rubber peep cap on the side of the engine where you check your timing, get a screw driver and stick it in to the ring gear cog and wiggle it up and down and make sure there is no play.  You'll know if it's not right beleive me it'll make the same rattling sound as when the motor is running

Hope this never happens to you.  For me it was about a 10 hour job

[Rob Valdez 79 R65]

CONGRATULATIONS!

And thanks for the feedback.


The original thread
http://www.bmwr65.org/cgi-bin/yabb2/YaBB.pl?num=1264818031

[Bob_Roller]

Did you replace the flywheel/clutch carrier, or did you replace the worn fasteners ?

[nhmaf]

That does seem an odd problem - I've heard of the rivets on the clutch friction disk letting go on several bikes, but had never heard of the ones on the flywheel/ring letting go before.   Good job on the diagnosis !!

[Tv]

Hey Bob, I replaced the whole unit rather than trying to get the fasteners replaced.  I suppose it could be done at an engineering place but quite frankly, I'd had enough and the convenience of simply picking up the second hand item outweighed the cost factor.

Now I can hear all the other noises I couldn't before. Thanks for your help

[Semper Gumby]

This was on the light weight flywheel?  (Post 9/80)

[Tv]

From '81 on I believe