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Do you know if I have a single or dual mass flywheel in my 1988 325ic? Can either one be resurfaced?
A
The M20 engine in your 88 325ic, uses a standard one-piece flywheel. All 325i models thru 91 (and the 92 325ic) use the one-piece flywheel. The dual-mass flywheel is used on 325e models from 5/86 on. The one-piece flywheel can be resurfaced, the dual mass units can not be resurfaced. However, the shop must be aware of the stepped surface and must cut the face in two steps, to keep the proper step height. BMW does not list a specification for the height of the step, but we have measured an average of 0.010″ for the height of the step on a new flywheel.
BMW non-dual mass flywheel - Note stepped friction surface
BMW non-dual mass flywheel stepped friction surface = 0.010"
Yes, the dual mass flywheel cannot be resurfaced. I have a 88 325 (super-eta). As my dual-mass flywheel was shot, it had to be replaced. I actually swapped it with a 325i flywheel (single mass). I also had to replace my clutch with a e30 325i clutch though.
The single mass flywheel I had resurfaced. Almost like turning brake rotors.
Does anyone know the OEM Part # for the single mass Flywheel?
The part number for the M20 325i “non dual mass” flywheel is 11 22 1 706 573. This is applicable to all E30 325i/is/ic/ix models from 12/86 – on.
Click HERE for E30 M20 Non-Dual Mass Flywheel