torque specs for 87 300E flex disc
 

I could swear that there was a thread here somewhere that gave the torque specs for the six bolts connecting the front flex disc. Now a can't find it. Could someone please post them here. I am planning on replacing the front flex disc in my car today.

Thanks.

p.s. ft/lbs would be cool...

nobody knows? I've got the new one on and everything back in place, just need to torque it up...

Should be 60Nm (There are two versions though, a version with smaller bolts the same size as the ones on the rear flex disc would need 45Nm).
Good luck, Bruno

My copy of the WIS shows M10 bolts - 40nm, M12 bolts - 60nm. May want to verify with dealer Service Manager.
Tim

all my new bolts were the same size and length. They all had a 17mm socket head. 3 had heads stamped 10.9, and 3 were stamped 8.8. I'm asssuming this is the grade of hardness. The old bolts connecting the tranny to the disc were allen head. The old ones connecting disc to driveshaft were regular socket, and luckily stamped 10.9, otherwise I would not have known were to put the new ones.

So considering they are all the same size, should they all be torqued to 60 nM?

or should I torque the lower grade bolts to 40 nM?

Sure they are all of the same length? I remember there were longer and shorter ones - it is however two months since I did this job.

yes, new ones were all the same length. I was actually a bit surprised b/c the new bolts connecting the tranny to disc cut it real close as far as going all the way through the nut, but they are not torqued yet, so...

what is M10 and M12? Thread size?

M10 and M12 are the bolt size (width), not thread. You are correct in guessing the 10.9 and 8.8 are hardness; 10.9 is comparable to Grade 8, 8.8 is comparable to Grade 5.

I believe (but not positive) that a 17mm hex head corresponds to M12.

If possible, you could go to a nearby hardware store to check out their metric bolt sizer.

In case you were wondering
 

Thread size is referred to as "pitch"; it actually refers to the space (in mm) between each thread.

Sorry - one more thing
 

1 N-m = 0.7376 ft.-lbs.

Therefore,
M10: 40 N-m = 29.5 ft-lbs.
M12: 60 N-m = 44.26 ft-lbs.