E30 M42 90A Alternator - BOSCH: 0 986 036 770 (BMW PN: 12 31 1 466 338) Core Unit Option:I will send my unit in for refurbishment Fits all E30 M3 with

Fits all E30 M3 with S14b23 / S14b25 engines

Squealing or whining when powered due to worn or seizing bearings

and depending on the ABS ECU's control state they will either be responsible for returning brake fluid to the master cylinder during a pressure reduction event ( operator experiences pedal pulsation ) or during a pressure increase event after wheel lockup is concluded ( and the operator is still applying firm pedal pressure )

Humps on the upper manifold casting

E30 M42 90A Alternator - BOSCH: 0 986 036 770 (BMW PN: 12 31 1 466 338) Core Unit Option:I will send my unit in for refurbishment Fits all E30 M3 withFits all E30 & early E36 318i & 318iS with M42 engines. 90A variant shown with period correct two tone zinc plating. Fan and pulleys in bright clear zinc, remaining hardware in yellow zinc. Glassfiber plastic wire routing cup is exceedingly hard to come by, NLA new from BMW, and hard to find in good shape original due to fragile nature. It is not included by default, but will be installed if included with your core! Bosch also refers to this unit as a