Engine Bolts Torque Specs [Archive] - M42club.com - Home of the BMW E30/E36 318i/iS

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badboypolar
03-09-2007, 05:20 PM
I know this may be highly debated, however I will post it anyway. You can aruge till you are blue in the face, but these values are working just fine for me.

Head Bolts:
E12 Socket
Coat threads in straight 30 weight oil or assembly lube (i.e. Redline)
22 ft/lbs initial
61 ft/lbs final
Stretch type, replace if you ever remove the head

Main Bolts:
17mm; 6 point
Coat threads in straight 30 weight oil or assembly lube (i.e. Redline)
20 ft/lbs initial
56 ft/lbs final

Rod Bolts:
10mm; 12 point
Coat threads in straight 30 weight oil or assembly lube (i.e. Redline)
30 ft/lbs final

Flywheel Bolts:
19mm; 6 point
85 ft/lbs final
new bolts have thread locker on it, if reusing bolts apply Loc-Tite Blue to threads, be sure to clean the threads very well.

I replaced my clutch OE allen bolts with 6 point bolts for accessability reasons
Clutch Bolts
Replacement bolts I used:
thread is 8mm x 1.25
12mm; 6 point
25 ft/lbs final

For those who use stock bolts
Stock Bolts:
6mm allen
25 ft/lbs

Motor Mounts & Drive Shaft Nuts:
thread is 8mm x 1.25
13mm; 6 point; locking nut
30 ft/lbs final
Be sure you use the locking nut type, otherwise you could loose your driveshaft.

Axel Bolts:
8mm allen
25 ft/lbs