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Normal Topic 79 R65 Clutch screw torque value (Read 89 times)
Jschara
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79 R65 Clutch screw torque value
10/31/18 at 07:59:58
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Can any one tell me what the clutch screws on my 1979 R65 should be torqued to?  Clymer BMW 500-1000- 1970-1982 says 17 ft. lb. I know thats not right because I just snapped one.  Time to reorder some more screws!

Thanks in advance,
Jim
  
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wilcom
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Re: 79 R65 Clutch screw torque value
Reply #1 - 10/31/18 at 08:09:45
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Here's a link to Snow Bum's torque page, could be of value.

http://bmwmotorcycletech.info/torquevalues.htm
  

Joe Wilkerson
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Burt
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Re: 79 R65 Clutch screw torque value
Reply #2 - 10/31/18 at 08:11:01
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That's the same figure I have in the Haynes manual.
  

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georgesgiralt
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Re: 79 R65 Clutch screw torque value
Reply #3 - 10/31/18 at 08:56:37
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Of which clutch screws are we speaking ?
On the flywheel ?
  
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Re: 79 R65 Clutch screw torque value
Reply #4 - 10/31/18 at 09:59:09
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17 in/lbs would be closer for the 8mm thread.
  

1978 R100RS| 1984 R65 | 1984 XT350 | 1992 KLE500 | 2002 R1150GSA
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Barry
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Re: 79 R65 Clutch screw torque value
Reply #5 - 10/31/18 at 11:00:43
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Clymers and no doubt Haynes copied the 17 ftlbs from the original BMW workshop manual but it's wrong and probably intended for the 8 mm screws used on other airheads. 

For your 6 mm screws you only need 7-8 ftlbs.

There are a few mistakes in the BMW manuals which get taken up by the likes of Clymers and Haynes so you can't necessarily trust any of them.  If a recommended torque value seems high always cross check against a standard table for the size and spec of fastener in question. Ironically the very first pages in the BMW manual include standard torque tables although with immense stupidity that can only be the result of men in white coats they give the torque values in units of Mkp which is equivalent to 9.8 Nm or 7.2 ftlbs. 
  

Barry Cheshire, England 79 R45
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Jschara
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Re: 79 R65 Clutch screw torque value
Reply #6 - 10/31/18 at 15:54:39
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Thanks to all for the quick reply.

Sorry georgesgiralt I should have been more precise.  The six screws that hold the clutch pack to the fly wheel.

Jim
  
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Bob_Roller
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Re: 79 R65 Clutch screw torque value
Reply #7 - 10/31/18 at 17:39:54
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I have a factory shop manual, it was charts for standard torque values for bolts and nuts .
For 6 mm bolt diameter, there a various torque values for different property classes of bolts .
The lowest value is 4 ft/lbs, the highest is 11 ft/lbs .
I'd say Barry has correct values for torque .
  

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