BMW K bikes (Bricks)

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1Back to top Go down    Engine noise on cold (again) on Tue Oct 18, 2016 2:38 pm

nino


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Having same problem of excessive noise when engine was cold, today I tried to do something with alternator which together with clutch was usual suspect. I always thought that three hard metal to metal point of alternator to engine block resonate too much. I have new bearings in alternator but it didnt help.

Just for test I removed alternator and put three rubber nitrile washers resistant to heat (100 C) and push it back. After bolt tightening I started the cold engine.
Noise partialy dissapeared. Ok I heard the cluth but only with released lever. With engaged lever engine was quiet even on low cold rpms.

Did anyone tried this method? What is experience with rubber washer durability? I used 2 mm thick washer inside diameter 8 mm. When tighten probably squeeze to 1 mm between block and three contacts.
Best regards

    

2Back to top Go down    Re: Engine noise on cold (again) on Tue Oct 18, 2016 3:03 pm

charlie99

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good work nino


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

3Back to top Go down    Re: Engine noise on cold (again) on Tue Oct 18, 2016 10:49 pm

blaKey

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Yeah, good work!

Any chance of a photo?


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Neil
K100RS 1986 RED!
K100RT 1987 (now nekkid with red bits)

Remember Rule No. 6
    

4Back to top Go down    Re: Engine noise on cold (again) on Wed Oct 19, 2016 7:12 am

nino


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Its very simple. Three nitrile rubber washer between alternator and engine block on connecting points. Inside diameter of washer 8 mm.


http://i97.servimg.com/u/f97/17/38/82/76/washer10.jpg

    

5Back to top Go down    Re: Engine noise on cold (again) on Wed Oct 19, 2016 7:21 am

blaKey

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Thanks!


__________________________________________________
Neil
K100RS 1986 RED!
K100RT 1987 (now nekkid with red bits)

Remember Rule No. 6
    

6Back to top Go down    Re: Engine noise on cold (again) on Wed Oct 19, 2016 7:09 pm

Crazy Frog

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Thanks Nino. This is a good tip.


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

7Back to top Go down    Re: Engine noise on cold (again) on Thu Oct 20, 2016 2:23 am

nino


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What I can say after yesterday driving around office - caffe - office - lunch - office, mostly on semi cold engine? Old K with 180 000 was noticeable quieter. Few engine runs 4 - 5 - 6 rpm were were somehow more pleasant without usual buzzing.
If anyone try this simple mode, share experience, please.
Best regards

    

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