1991 E32 750iL Engine Swap

[thombus]

Hello all, I'm new to the forum. Looking to replace head gaskets on the E32s M70 engine. Head gasket replacement parts for the M70 are scarce. Are other known engines that are compatible with the E32 750iL?

Please and thank you!

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Forgot to subscribe myself to the thread

[shogun]

there are plenty of head gaskets available, only E32 750 and E31 850 have the M70 engine
https://www.bimmerforums.com/forum/s...M70+headgasket
https://www.bimmerforums.com/forum/s...M70+headgasket
https://www.bimmerforums.com/forum/s...M70+headgasket
Autohausaz dot com has for $29.99 each
11121729893 VictorReinz Cylinder Head Gasket; Right (Cylinders 1-6); 1.64mm
11121729897 VictorReinz Cylinder Head Gasket; Left (Cylinders 7-12); 1.64mm
for assembling and torques use the Bentley repair manual for the E32 or the workshop manual from the E31 which is online here and shows also the M70 engine http://www.mwrench.com/

Please add to your profile: 1991 E32 750iL

[thombus]

Thank you for the in-depth answer, Shogun.

Cheers

[Sansouci]

Are the head bolts single use?

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[shogun]

https://www.bimmerforums.com/forum/s...oil-head-bolts
https://www.bimmerforums.com/forum/s...o-yield-or-NOT
you can double check in the repair manual, but I would use new ones.
Mahle website says:
Most modern engines use Torque-to-Yield cylinder head bolts. Engine manufacturers specify this design to obtain a more accurate clamping force on the surface of the gasket. These bolts use a “Torque turn” method of tightening. Typically, the bolts are torqued to a specification, then are turned an additional specified number of degrees. This stretches the bolt to its yield point for optimal application of clamp load. DO NOT attempt to reuse a Torque-to-Yield bolt. Used Torque-to-Yield bolts are permanently stretched and will not apply the proper load to the gasket to maintain a long term seal.

BMW 5.0 1988-1992, Rod Torque 7,22 FT/LBS, + 60° , Main Torque 36 FT/LBS + 70°, Cylinder Head Bolt Torque 22#, WAIT 15 MIN, + 120° see page 7 https://www.mahle-aftermarket.com/me...ls/torque3.pdf