what is the right way to tighten e30 320i cylinder head.

[madbuck]

hi i need some info,,,, bmw e30 320i cylinder head , re-fitting, head first torqe to 30 nm , leave for 15 mins then 90 deg, then run engine bleed then , re move rocker cover then torqe 90 deg again is this right,, ???????? cheers,,,,,,,,,,,,,,,

[Grrrmachine]

http://www.e30zone.net/e30zonewiki/inde ... Head_Bolts

[AlpineCab]

just did this a couple of weeks ago using the torx bolts and the advice from BMW torque specs pdf (can be found on web is)

torque 30 Nm
torque angle 90 °
torque angle 90 °
No settling time.
No warm-running time.

[Brianmoooore]

just did this a couple of weeks ago using the torx bolts and the advice from BMW torque specs pdf (can be found on web is)

torque 30 Nm
torque angle 90 °
torque angle 90 °
No settling time.
No warm-running time.

I agree with this, not what it says in the wiki. After the 30Nm angle torque, I always mark a line on the bolt heads at the 12 o'clock position with a permanent marker, so that when they have all been torqued through the remaining 180 degrees you can check visually that all the marks are at 6 o'clock, and be certain you haven't missed one.
Under M20, hex headed bolts, the wiki should read "remove, place in bin, and buy torx headed stretch bolts."

[Grrrmachine]

I'll make your subtle amendments, Brian

[daimlerman]

Be better,assuming the hex headed bolts are still in use,to ammend the wiki to read;
'Remove hex headed bolts one at a time and replace with new torx headed stretch bolts.Place old bolts in bin.'

This way,the head does not need to be removed,saving the gasket,need to skim,cambelt etc.