BMW K bikes (Bricks)

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1Back to top Go down    Noise after engine swap on Sun Nov 19, 2017 4:42 pm

bigdavergs

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Hi all. Did an engine swap on my k100 ('84). Put in a similar age engine which seemed ok. Put in new 'monkey nuts', new cam chain. After starting up, there is an ocassional loud clang from the alternator side of the engine. It sounds like something is hitting the engine case. Any thoughts? Also, the throttle bodies are now slow to return after opening the throttle and the cam chain sounds quite rattly. Many thanks, Dave.

    

2Back to top Go down    Re: Noise after engine swap on Sun Nov 19, 2017 5:59 pm

92KK 84WW Olaf

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Very easy to remove the right hand engine cover to geta look at timing chain.

Happy the alternator monkey nuts are ok?


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 82,200 miles
    

3Back to top Go down    Re: Noise after engine swap on Sun Nov 19, 2017 6:32 pm

Dai

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Yup - sounds like you managed to get the alternator mounted 30 degrees out i.e. the drive flanges did not go down the middle of the monkey nuts. There's a cast mark on the flange cup to help you line up with the centre of the monkey nuts - it can be a real bugger to push the drive flanges into new nuts, so I usually smear the nuts with silicon grease.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

4Back to top Go down    Re: Noise after engine swap on Mon Nov 20, 2017 3:04 am

charlie99

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cam chain rattling sounds like the teeth on the chain tensioner mechanism have become rounded (deep inside the tensioner ) letting the tensioner backlash down to minimal tension of the bow spring runner across the length of the cam chain guide which seems quite common on older engines

don't know the solution other than changing the tensioner but willing to experiment , have an issue in re case hardening after modification though no heat tools suitable here in my awning workshop ...giggles '


good luck with the solves


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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
    

5Back to top Go down    Re: Noise after engine swap on Mon Nov 20, 2017 3:49 am

bigdavergs

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Thanks chaps for the input. Dai, I did think that maybe I hadn't done something right with the alt'. I'm about to go into the garage and check it out. Thanks once again, Dave.

    

6Back to top Go down    Re: Noise after engine swap on Mon Nov 20, 2017 5:10 am

92KK 84WW Olaf

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I bought a timing chain kit for the K100RT but I also got the tensioner with it. I thought it was advised to change it with the chain on older Ks. Mine has 89,000 miles.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 82,200 miles
    

7Back to top Go down    Re: Noise after engine swap on Mon Nov 20, 2017 7:27 am

bigdavergs

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Hi Olaf, I didn't get the tensioner, probably should have. Dai, I checked the alternator nuts, all was fine, but it's still making a lot of noise. When I swapped the motor over, I also put in a new alt bearing. When I first put the motor back in the frame, then put the alternator in, it wouldn't go all the way onto the drive dog. Closer inspection showed that the bolt i used to hold the drive dog on was too big and was stopping the alternator from sliding home fully. I took it out and replaced it with a correct size bolt from a spare engine. Could something have gone amiss on the inside of the bell-housing when I did this? Cheers again, Dave.

    

8Back to top Go down    Re: Noise after engine swap on Mon Nov 20, 2017 7:59 am

Dai

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Only if you pulled the alternator up hard with the wrong bolt in. If you realised there was something up before you got to that stage then you might be okay. Best thing to do is... pull the alternator and have a look inside with a torch.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

9Back to top Go down    Re: Noise after engine swap on Mon Nov 20, 2017 8:12 am

bigdavergs

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Thanks for the reply Dai. When you say pull the alt and look with a torch, do you mean pull off the drive dog and peer into the bell housing through the hole? I'm a trifle reluctant to take the motor out again, pull the clutch and bell housing, although if that's the only option...
Thanks again, Dave.

    

10Back to top Go down    Re: Noise after engine swap on Mon Nov 20, 2017 6:36 pm

Dai

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Having checked this:

http://www.realoem.com/bmw/enUS/showparts?id=0511-USA-04-1984-K589-BMW-K_100_83_0501,0511_&diagId=11_4686

- I'm beginning to agree more with the others that if you didn't pull the alternator up hard with the wrong bolt, then the cam chain may be the problem. If the metallic slap occurs on a sudden throttle-off it's a good pointer that the cam chain is the problem. As Charlie says, pulling the righthand crankcase off to get access to the bottom drive gear of the chain is an easy job...

http://www.realoem.com/bmw/enUS/showparts?id=0511-USA-04-1984-K589-BMW-K_100_83_0501,0511_&diagId=11_1774

(item 7) but if it's never been off before I'd be inclined to get new sealing rubbers and a gasket. The only time I didn't do that LFB pissed all over the floor on startup. If the chain lifts free of the gear then most likely it's fooked, but I'd rather someone who has had that problem chimes in here and specifies just what is acceptable.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

11Back to top Go down    Re: Noise after engine swap on Tue Nov 21, 2017 7:50 am

bigdavergs

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Thanks Dai once again, cheers, Dave.

    

12Back to top Go down    Re: Noise after engine swap on Tue Nov 21, 2017 8:30 am

92KK 84WW Olaf

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You can fire up the engine with the alternator off.......try that and see what you get.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 82,200 miles
    

13Back to top Go down    Re: Noise after engine swap on Tue Nov 21, 2017 2:31 pm

Motorbike Mike

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@Dai wrote:Yup - sounds like you managed to get the alternator mounted 30 degrees out i.e. the drive flanges did not go down the middle of the monkey nuts. There's a cast mark on the flange cup to help you line up with the centre of the monkey nuts - it can be a real bugger to push the drive flanges into new nuts, so I usually smear the nuts with silicon grease.
I'll second that Dai but even with grease the rubber dampers still try to close together when you (try to) push the alternator into position.

    

14Back to top Go down    Re: Noise after engine swap on Wed Nov 22, 2017 5:08 am

bigdavergs

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Thanks Olaf and Mike, I'll give that a try also. Cheers, Dave.

    

15Back to top Go down    Re: Noise after engine swap on Wed Nov 22, 2017 8:06 am

Dai

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@Motorbike Mike wrote:
I'll second that Dai but even with grease the rubber dampers still try to close together when you (try to) push the alternator into position.
I don't even bother to try to push them in after fighting new nuts twice (different bikes). On the third one I made sure everything was lined up, put in a couple of bolts that were way too long (top and right) and drew the alternator in that way. Keeping downward hand pressure on the alternator substituted for the 'missing' third bolt because I was too lazy to fiddle one in. You know when the alternator is in because the bolts suddenly start winding in really easily; at that point a good shove will seat it and you can put the correct length bolts in. It takes less time to do than it does to describe.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

16Back to top Go down    Re: Noise after engine swap on Wed Nov 22, 2017 8:26 am

Motorbike Mike

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@Dai wrote:
@Motorbike Mike wrote:
I'll second that Dai but even with grease the rubber dampers still try to close together when you (try to) push the alternator into position.
I don't even bother to try to push them in after fighting new nuts twice (different bikes). On the third one I made sure everything was lined up, put in a couple of bolts that were way too long (top and right) and drew the alternator in that way. Keeping downward hand pressure on the alternator substituted for the 'missing' third bolt because I was too lazy to fiddle one in. You know when the alternator is in because the bolts suddenly start winding in really easily; at that point a good shove will seat it and you can put the correct length bolts in. It takes less time to do than it does to describe.
I'll try that if there is a next time.
I must admit that I didn't think of using the bolts to help the alternator back in.
I'm a gentle man with loving hands you see. Laughing

    

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