BMW K bikes (Bricks)


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1Back to top Go down    Engine and transmission Empty Engine and transmission Tue Jan 28, 2014 6:13 am

Pat O'D

Pat O'D
Silver member
Silver member
Checked the valve clearance on my K100LT today found that all exhaust valves were 0.25 so they do not require adjustment.
Now the Inlet valve clearance is another matter, all measured at 0.10 that is outside the required 0.15 - 0.20 for inlet valves. As I am not confident enough to attempt replacing the shim's, and on a tight budget. what kind if damage is likely, if I leave things the way the are.

Your advice please

Regards

Pat


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1991 K100LT Red (VIN 0191558) 138000 Miles 

 Engine and transmission Ir-log10
    

2Back to top Go down    Engine and transmission Empty Re: Engine and transmission Tue Jan 28, 2014 8:55 am

rosskko

rosskko
VIP
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Pat, from what I saw of shim changing, if you have enough mechanical knowledge to measure the gap you have enough to replace the shims.

Shim tool compresses the spring, old shim falls out, new shim drops in, remove tool, ride bike.

Didn't answer your question, but someone else will chime in soon enough.


__________________________________________________
1986 K100RT VIN 0093801K100RT with summer fairing for a northern visitor

Basic/2 6308802K100CJ  05/1988

K1100RS 0194321
    

3Back to top Go down    Engine and transmission Empty Engine and transmission Tue Jan 28, 2014 9:12 am

Pat O'D

Pat O'D
Silver member
Silver member
Hi rossko, 

Thanks for the response, I will get the tools and see how it goes from there 

Pat


__________________________________________________
1991 K100LT Red (VIN 0191558) 138000 Miles 

 Engine and transmission Ir-log10
    

4Back to top Go down    Engine and transmission Empty Re: Engine and transmission Tue Jan 28, 2014 9:20 am

92KK 84WW Olaf

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Life time member
Life time member
Pat

If all measure 0.10 you will need thinner shims. But to do that you need to know the thickness of the shims you already have in the bike. You can only find that by taking them out and looking at the thickness stamped on all of them.

Happy to talk on that but have never done a K. You need a tool to get the shims out but its a case of just being methodical. I am curious though that they all measure the same 0.10 while the exhausts were all in spec. Before you go further double check the feeler gauge.

If you know Jim Ellis. He may have one.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 49,200 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

5Back to top Go down    Engine and transmission Empty Re: Engine and transmission Tue Jan 28, 2014 10:24 am

rawdonball

rawdonball
Gold member
Gold member
I would agree that with them all being the same, that it is more likely that they were set up like that rather than the gaps having closed up due to wear on valve seat / valve head surfaces.

My understanding is that the tappet clearances are there to ensure that the combined thicknesses of the oil films that form between lubricated surfaces when running, do not prevent the valves from closing fully. Hence if you are using a modern multigrade oil that is never going to be as viscous as the oil for which the bike was designed (when running at the colder end of the range), I would guess your current clearances may be fine. Still, I would bow to people with more practical experience than this "new comer"

Interesting point - many people will say that the tappet clearances are to ensure that valves still close with the differential expansion which takes place across the operating temperature range. All the literature I have ever seen that quotes different clearance settings for hot and cold, has had the figures for "hot" larger than the figures for 'cold'. This would imply that the need for a clearance setting has nothing to do with differential expansion.

To be continued I hope - just got a call to head out to the coal seam gas field for some well head inspections.


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'88 K100RT, '86 K75C, '05 Yamaha TTR250
    

6Back to top Go down    Engine and transmission Empty Re: Engine and transmission Tue Jan 28, 2014 10:25 am

Rick G

Rick G
admin
admin
Running them one size to tight wont do much even in the long term but if you do that as I do then you need to keep a good eye on them and in most cases it is best from an ease of maintenance point to keep them at the specified clearance


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

7Back to top Go down    Engine and transmission Empty Re: Engine and transmission Tue Jan 28, 2014 5:02 pm

MikeP

MikeP
Life time member
Life time member
Pat O'D wrote:Hi rossko, 

Thanks for the response, I will get the tools and see how it goes from there 

Pat
Pat,

I have the BMW tools here doing nothing but looking pretty in a drawer. You are welcome to borrow them if you wish. Send me a PM with your details and I'll post them over, you can post them back once you're done with them.


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1992 K1
1993 K1100R (used to be an LT)
    

8Back to top Go down    Engine and transmission Empty Re: Engine and transmission Tue Jan 28, 2014 5:11 pm

rosskko

rosskko
VIP
VIP
There you go Pat.
Looks like you just organised a VALVE PARTY at your place.


__________________________________________________
1986 K100RT VIN 0093801K100RT with summer fairing for a northern visitor

Basic/2 6308802K100CJ  05/1988

K1100RS 0194321
    

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