M20 325i head bolt torque procedure question

[mike87]

No need to warm it up

thank you

[digger]

No need to warm it up

[mike87]

Hi all,

I'm about to reinstall my head and I'm seeing conflicting answers on what head bolt torque should be for the 14 M10 torx head bolts.

BMW's torque manual (http://www.e38.org/bmw_torq.pdf) says it should be 30nm, then 90deg + 90deg with no settling time and no warm running time

E30 zone (https://www.e30zone.net/e30wiki/inde...orque_Settings) says 30nm, wait 15mins & tighten additional 90deg then another 90deg with engine at normal working temperature

Anyone know which is right? Is it mandatory that I do the second 90degrees with the engine warmed up, or should I follow BMW's directions?

Thanks,
Mike