deliriousga

I'm putting in new swaybars and I can't find the torque for the rear cross member to the body in the FSMs. The crossmember I'm talking about is the one the tranny sits on. I need the torque values for the two bolts that are underneath holding the cross membe to the body and also for the four bolts (two on each side) that are in the wheel well.

Anybody know what they are?

TIA!

deliriousga

Thanks for the help.

Rob Edwards

Could you share what the voices said the torque value was?

davek9

Else you could look here:
http://members.rennlist.com/pirtle/s4torque.htm

Rob Edwards

Neither the WSM nor Pirtle's site list a specific value for the inboard crossmember-to-body bolt, which is an M12 x 45. They only list a value for the four outboard bolts, which are M10's. I decided to use 63 ft lbs, since many other M12 bolts on the car use this value.

davek9

I would think that would be OK too, as the Front Cross member to body 19mm (heads) are 63 ft lbs.

SeanR

42-02 has most of the torque specs.

borland

For the outer bolts:

WSM Vol 4, page 42-02 specifies: "Transverse member to body", M10, ..... Torque: 46 Nm ( 33 ft-lb ).

For the inner M12 bolts....

WSM Vol 3, page 37-123, ".... tighten transmission mounts/cross member bolts with 85 Nm/ 61 ft-lbs. "

Vilhuer

What we need is someone to crack PDF PET protection so that its possible edit text in them and add all TQ's directly into those files. Life would be so much easier in garage.

Rob Edwards

Erkka-

I got a start on making a table of torque values - I'm still collecting values for pre-S4 cars but eventually I'd like to make a spreadsheet of 3 or 4 pages that can be laminated and used in the garage. Or a wall chart, either way. Not there yet, tho:

https://rennlist.com/forums/928-foru...readsheet.html

Vilhuer

PET would be logical choice as it doesn't require much knowledge of english language to understand when all needed is pictures and numbers. There has to be some software which can crack PDF protection.

Hilton

I ran into this today - those inner cross-member to body bolts with no torque value.

The transmission ones are indeed 61ftlb's, and are also M12, however those are grade 8.8 bolts.

The M12 bolts from the cross member to the body are grade 10.9 - and the generic torque value for them (10.9 zinc plated) is 97 ftlbs, as can be see here in the table at the bottom of page 1.

The quote Borland mentions above I don't read as meaning those bolts.. I think "tighten transmission mounts/crossmember bolts with 85 Nm" on page 37-123 means the bolts between the transmission mounts and cross member, not the ones we have no value for.

Rob - did you ever find a correct factory-stated value for these bolts?

borland

Yes, you have a good point Hilton, but I think the referenced torque (61 ft-lbs) is still good enough.

I would advise not using that higher torque rating (97 ft-lbs) in your referenced table. The bolt can likely survive that much torque, but the chassis threads may not. With the bolt fully inserted, you may not have as many threads engaged as a standard grade 10.9 nut, thus you could run the risk of stripping the threads in the body.

Hilton

Yep, exactly my fear Borland. Stripping those threads would be a major PITA - I'd have to drop the transmission again to do anything like a timesert or helicoil.

I just can't help wonder why the factory used 10.9 for those two bolts.. but 61 ftlbs is what I'd decided last night to go with. If they work loose or anyone else has found them loosened due to vibration, I'll step it up 10ftlbs and try again.

TAREK

Hilton,
They won't work loose. I've overtorqued these before and it was a PITA to fix