M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Engine + Driveline => Topic started by: robertm on February 03, 2010, 02:53:17 PM

Title: head bolt specs please
Post by: 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.

Title: head bolt specs please
Post by: 4banger 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.

Title: head bolt specs please
Post by: robertm on February 05, 2010, 01:15:57 PM

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

Title: head bolt specs please
Post by: 1991 E30 M42 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

Title: head bolt specs please
Post by: 1991 E30 M42 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

Title: head bolt specs please
Post by: robertm on February 06, 2010, 06:34:19 AM

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

Thanks.

Title: head bolt specs please
Post by: BlueBMW on February 06, 2010, 07:14:13 AM

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

(http://i905.photobucket.com/albums/ac253/bmcdanold/Car%20stuff/CylHeadTorque.jpg)

Title: head bolt specs please
Post by: Choking Hazard on February 08, 2010, 04:30:36 PM

15 minutes between second and third sequnce....