Sachs SMF Flywheel Bolt Torque Spec

[coolvdub]

Yes, I searched. Maybe I just suck at it. Since there were no torque specs in the box and I am upgrading from the DMF set up. Can anybody give me the proper torque specs for the sachs SMF kit. Purchased from a trusted vendor, but the box was missing parts and it has been a fiasco. Please help me out if you can. Trying to put the motor and tranny back in the car. Car has been down since november of last year and I really need to get it back up and running.

I'm thinking the correct torque is the 44 foot pounds plus 1/4 turn. But want to make sure it is right.

 

[Seatman]

Just use the Mk3 settings, same thing

"Flywheel bolt torque: stage 1: 22 ft-lbs. stage 2: 44 ft-lbs. final stage: additional 1/4 turn (90o turn)
pressure plate bolt torque: hand tight, then tighten diagonally or in a pattern, in stages, to a final torque of 15 ft-lbs. Tightening the bolts in stages like 2 turns each bolt in a star pattern diagonally across the pressure plate keeps it flat while tightening."

I took that from here

http://www.myturbodiesel.com/wiki/clutch-and-flywheel-removal-rear-main-oil-seal-replacement-mk3/


Personally I used the ooooft! method, never lets me down

 

[coolvdub]

Thanks Seatman. Just the information I was looking for. Really appreciate the help.

 

[Seatman]

No worries, nice kit, fitted the same one last year and have no regrets

 

[ranagon]

Old thread ... but a good reference.

44 ft. lbs plus 1/4 turn makes my 1/2 inch torque wrench click at about 95 ft. #.

That seems high .... 90% proof torque on a M10x1.0 DIN 12.9 bolt is 82 n-M or about 60 ft. #.

See ...

Bolt torque calculator

Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model

www.online-iso-calculator.com

I guess you're just supposed to take the bolts almost to yield.

Does anyone else have an observed correlation between the '1/4 turn' method and actual applied torque for flywheel bolts?

 

[yahmon]

Just use the Mk3 settings, same thing

"Flywheel bolt torque: stage 1: 22 ft-lbs. stage 2: 44 ft-lbs. final stage: additional 1/4 turn (90o turn)
pressure plate bolt torque: hand tight, then tighten diagonally or in a pattern, in stages, to a final torque of 15 ft-lbs. Tightening the bolts in stages like 2 turns each bolt in a star pattern diagonally across the pressure plate keeps it flat while tightening."

I took that from here

http://www.myturbodiesel.com/wiki/clutch-and-flywheel-removal-rear-main-oil-seal-replacement-mk3/


Personally I used the ooooft! method, never lets me down

my sachs clutch came with 12.9 grade m8 capscrew for pressure plate, according to normal torque tables they can go 42.6 NM or about 31ft/lbs.
I put mine in with locktite at 25ft/lbs. To much or to little??

 

[BobnOH]

The book spec is likely for torque to yield fasteners. Very possible kits are sold with different ISO class fasteners. You can look up general torque specs by ISO, thread size and pitch etc.

 

[norbert77]

Old thread ... but a good reference.

44 ft. lbs plus 1/4 turn makes my 1/2 inch torque wrench click at about 95 ft. #.

That seems high .... 90% proof torque on a M10x1.0 DIN 12.9 bolt is 82 n-M or about 60 ft. #.

See ...

Bolt torque calculator

Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model

www.online-iso-calculator.com

I guess you're just supposed to take the bolts almost to yield.

Does anyone else have an observed correlation between the '1/4 turn' method and actual applied torque for flywheel bolts?

Old thread rehash, just did min and checked, seem to be 91-92 ft pounds