M5 S85 Flywheel bolt torque

[B737Capt]

Does anyone know the proper torque for the dual mass flywheel bolts on an 2008 M5 S85 engine?
Thanks

[ecain63]

You fitting a new clutch yourself or are you finding out for an indy?

As for the figures, your best bet is to phone a dealer and ask them. Not many here have experience fitting a clutch and fly to an E60/1 M5.

[TheEnd]

105Nm is listed for the 2007 M5, which was when the TIS system swapped from native to online.

[stevesingo]

What size, thread pitch and grade bolt (10.9 of 12.9)? This is all you need to know to find the torque through Google.

M12x 1.75
8.8 82 Nm (ft. lbs.)
10.9 115 Nm (ft. lbs.)
12.9 140 Nm (ft. lbs.)
M12x1.5
8.8 87 Nm (ft. lbs.)
10.9 123 Nm (ft. lbs.)
12.9 147 Nm (ft. lbs.)

Steve

Edited by stevesingo on Thursday 1st November 20:24

[ecain63]

105NM is what ive found for the 2007 too. Same as the E39 M5 values strangely!

[B737Capt]

Yes doing it myself and have the centering tool and flywheel locking tool. Got the DM Luk flywheel and Sach dual clutch. Just doing my homework as car still runs well. Didn't take long to get this info. Thanks

[ecain63]

Just make sure the car has its clutch adaptations reset by a dealer afterward else the new clutch will lunch itself! Good show doing it yourself though.

[B737Capt]

Oh I will. While the tranny is on the floor, I'll zero out the pump with a new one. They are under 300 here in the states. Install new PLCD sensor and put in new hyd fluid. Bought the brass piviot point instead of plastic. Bolt it all back up and flat bed to a dealer and have the bleeding, PLCD re calibrated and clutch relearn. Figured while it's hooked up to the computer, do all of that. Just got a supplier here in the states to get clutch and FW delivered for 1499 US. Found the centering tool on ebay. As they say here in NASCAR country, "It don't get no easier than that".

Edited by B737Capt on Thursday 1st November 23:08

[B737Capt]

While we are at it, I am having trouble finding the torque value for the (9) M6 x 50 bolts that mount the clutch to fly wheel. The SMG clutch uses M6 x 50. The non SMG clutch uses (6) M8 x 18 bolts and realoem says they are 10.9 grade. No grade given for the SMG 6x50 bolt. Anyone know the correct torque value for the M6x50? Thanks

[TheEnd]

I've got 10+2Nm listed, tighten in a crossing diagonal pattern 1/2 a turn at a time.

[ecain63]

B737Capt said:

While we are at it, I am having trouble finding the torque value for the (9) M6 x 50 bolts that mount the clutch to fly wheel. The SMG clutch uses M6 x 50. The non SMG clutch uses (6) M8 x 18 bolts and realoem says they are 10.9 grade. No grade given for the SMG 6x50 bolt. Anyone know the correct torque value for the M6x50? Thanks

Doesnt the torque value of these ones depend on new or original/used bolts? Read somewhere about the difference but cannot remember where.

[B737Capt]

Thats guys for the replies. What I have found so far on the internet was a TIS section on the S85 SMG clutch and it showed the 9 bolt holes. There were several refrences to bolt torque but did not list the M6 bolt size. One area did say "ZNS bolts E60 S85 jointing torque 15NM, torque angle 25 degrees". What's the angle degree about? Turn an additional 25 degrees after the 15 NM? I bought 9 new bolts so they won't be used bolts. I've noticed the degree angle mentioned a lot in different BMW torque specs. Would you use blue loctite?

BTW I'm having my new guide bushing treated. It will be cryo'ed, then an REM process which is another harding process and then finally tungsten disulfided added to act like a permanent dry lubricant. This is done on race car engine parts so I will be interested to see if the guide bushing will hold up to this. Can't be worse.

Edited by B737Capt on Wednesday 7th November 20:20