Author Topic: head bolt specs please (Read 5887 times)

robertm · « **on:** February 03, 2010, 02:53:17 PM »

Pulled the head for the first time last night. Amazingly simple! Took me and a buddy just over an hour.

I was wondering if anyone had head bolt torque specs please? (Please indicate if they are oiled or dry also)

Should have added. This is for factory gasket and bolts.

Thanks.

4banger · « **Reply #1 on:** February 03, 2010, 04:41:24 PM »

22 ft/lbs initialy then 61 ft/lbs final. these are strech type headbolts. they need to be replaced. give em a coat of 30w oil or assembly lube. i use lubriplate.

robertm · « **Reply #2 on:** February 05, 2010, 01:15:57 PM »

That's what I needed thanks! How many hours you wait before final tightening?

1991 E30 M42 · « **Reply #3 on:** February 05, 2010, 03:26:15 PM »

the tightening sequence is:
stage 1: 30Nm(22 ft-lb)
stage 2: 90*
stage 3: 90*

make sure the bolts are oiled, do not use anti-seize though as it will throw off you initial torque setting

1991 E30 M42 · « **Reply #4 on:** February 05, 2010, 03:28:50 PM »

and the sequence looking from the right side of the car (exhaust side of the engine) is

7 - 5 - 1 - 3 - 9
10 - 4 - 2 - 6 - 8

robertm · « **Reply #5 on:** February 06, 2010, 06:34:19 AM »

All looks good. Still haven't heard what the wait time is between tightenings.

Thanks.

BlueBMW · « **Reply #6 on:** February 06, 2010, 07:14:13 AM »

Looks like on the M42, there isnt a wait time...

Choking Hazard · « **Reply #7 on:** February 08, 2010, 04:30:36 PM »

15 minutes between second and third sequnce....