The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Jschara on October 31, 2018, 07:59:58 AM

Title: 79 R65 Clutch screw torque value
Post by: Jschara on October 31, 2018, 07:59:58 AM

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

Title: Re: 79 R65 Clutch screw torque value
Post by: wilcom on October 31, 2018, 08:09:45 AM

Here's a link to Snow Bum's torque page, could be of value.

http://bmwmotorcycletech.info/torquevalues.htm

Title: Re: 79 R65 Clutch screw torque value
Post by: Burt on October 31, 2018, 08:11:01 AM

That's the same figure I have in the Haynes manual. 

Title: Re: 79 R65 Clutch screw torque value
Post by: georgesgiralt on October 31, 2018, 08:56:37 AM

Of which clutch screws are we speaking ?
On the flywheel ?

Title: Re: 79 R65 Clutch screw torque value
Post by: Tony Smith on October 31, 2018, 09:59:09 AM

17 in/lbs would be closer for the 8mm thread.

Title: Re: 79 R65 Clutch screw torque value
Post by: Barry on October 31, 2018, 11:00:43 AM

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. 

Title: Re: 79 R65 Clutch screw torque value
Post by: Jschara on October 31, 2018, 03:54:39 PM

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

Title: Re: 79 R65 Clutch screw torque value
Post by: Bob_Roller on October 31, 2018, 05:39:54 PM

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 .