Slow clutch engagement on E46, E39, and E53
A little-known detail about the 1996-1999 M3/MZ3 3.2l (including Euro cars)
is that they too have this part. Similar to the affliction of the E46 and
E39, except this valve only seems to affect cars with aftermarket lightweight
flywheels. Due to the quick-revving nature of these setups, the
slow-down of the check valve causes momentary excessive clutch slippage. A
particular example is a "power shift" where the revs hang for a moment
before fully engaging. M3s with the 3.0l engine do not have this part, nor
do any other E36.
The good news is this valve can be removed from the system with no
additional parts required. The check valve is threaded into the clutch slave
cylinder with an end that matches the end on the metal hydraulic line so all
that needs to be done is remove the valve assembly and reinstall the line to the slave cylinder. Bleed
any air out of the hydraulics and you are done.
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