sub frame mounting?

[jakebass12]

i have a 81 r65 and i was wondering if someone could tell me how all the bolts and washers and nuts all go together right. i figured out how to get it all together but im not sure if there are any missing because someone took this apart before me. so any help would be appreciated.

[Rob Valdez 79 R65]

On the top-front mount, the tapered, hex-head bolt goes in first from the inside.
On the outside you should have a wave washer, then the nut.

On the lower front mounts, it is just a standard bolt and washer from the outside with a wave washer and then the nut on the inside.

Both of those are illustrated here: http://www.realoem.com/bmw/showparts.do?model=0364&mospid=51897&btnr=46_0074&hg=46&fg=05


The top shock mount bolts are M10x45 (mine are fine thread, I believe).
The bolts go on from the outside with a wave washer under both the head of the bolt AND the nut, as illustrated in this image: http://www.realoem.com/bmw/showparts.do?model=0364&mospid=51897&btnr=33_0625&hg=33&fg=25

Tighten everything WELL!

[jakebass12]

thanks allot. i guess i need to get some wave washers im missing a couple.

[montmil]

thanks allot. i guess i need to get some wave washers im missing a couple.

I buy my metric wave washers at both Lowe's and Home Depot. Handy and priced right.

Monte

[Barry]

On the top-front mount, the tapered, hex-head bolt goes in first from the inside.

Well that's interesting. Mine are the other way around which explains why the battery is a tight squeeze past the end of the bolts. Hands up anybody who still has the decorative caps #9 in the diagram.

Tighten everything WELL!  

My inclination exactly as we want that rear sub frame to be rigid which is why it's always been a puzzle to me that the recommended torque for these bolts is only 11 - 12.5 ft lb  Without checking the exact figures that's way lower than typical for a high grade 8mm nut and bolt. The only reasoning I can think of for such a cautious figure is that in this location a sheared bolt is just as dangerous as a loose one actually more so as there would be no warning of failure.

I think I compromised between what the book said and what felt right and gave them 15 ft lb

[Bob_Roller]

Hands up anybody who still has the decorative caps #9 in the diagram.

All of my caps are still there !!!!

Kinda surprising, as just about everything else made  of plastic has long since deteriorated !!!!

[Rob Valdez 79 R65]

Rob Valdez 79 R65 wrote on Today at 15:34:02:
On the top-front mount, the tapered, hex-head bolt goes in first from the inside.


Well that's interesting. Mine are the other way around which explains why the battery is a tight squeeze past the end of the bolts.

Barry, that was one of the many improvements made to the '81-on models.

[Barry]

Barry, that was one of the many improvements made to the '81-on models.  

Something else to add  to the list of differences which gets longer all the time. Also probably means I never had the decorative caps.

[VaSteve]

I have never used this but it looks like a good place to get bolts...

http://www.theboltguy.com/