Charging System - Possible Insufficient Charge

90bmw06

GROUP 12 Engine - Electrical
Bulletin Number 12 08 89 (1959) Page 1 of 2
Woodcliff Lake, NJ January 1990 Service Engineering
This Service Information bulletin supersedes S.I. 12 11 88 (1760). It lists revised procedures.

Please remove and discard S.I. 12 11 88 (1760) from your S.I. binder.

SUBJECT: Overall Charging Condition

MODEL: E32 (Vehicles produced 1/87 - 9/88)

Situation: Under certain driving conditions (city; stop and go), particularly during the winter months, it is possible that the battery may not receive a sufficient charge. As a result, the engine may not restart when turned OFF.

Vehicles produced 10/88 and later have been equipped with smaller diameter alternator pulleys to increase alternator output at low engine RPMS.

All previously produced vehicles (without smaller pulley) should have the smaller pulley installed to prevent customer dissatisfaction.

Vehicles
Affected: Model Chassis No. Range

735i 163 0008 163 0916

735iA 164 0023 164 4973
320 0002 321 3047

735iL 331 5003 331 8573

750iL 276 5001 276 9322

Corrective
Action: Alternator Pulley Installation 735i/735iL - replace the existing alternator pulley (77 mm) with a smaller pulley (70 mm) P/N 12 31 1 722 983 (torque pulley nut to 36 ft.lb.)

750 iL - replace the existing alternator pulley (54 mm) with a smaller pulley (46 mm) P/N 12 31 1 720 368 and new fan wheel P/N 12 31 1 725 734 (torque pulley nut to 36 ft.lb.)
Note: To gain access to the alternator pulley, remove the engine cooling fan and fan shroud.

Service Action Label
Instructions: This Service Action has been assigned code number 26. After the prescribed work has been performed, obtain a label (SD 89-003) and

a) Emboss your BMW dealer warranty number in the middle of the label.

b) Punch out code number 26 printed on the label.




c) Bend label to crease an edge and remove the backing paper. Then affix it to the "B" pillar (on driver's front door) as shown.

If the car affected already has a label from a previous Service Action/Recall Campaign, affix this new label next to the old one. Do not affix one label on top of another one because a number from an underlying label could appear in the punched out hole of the new label.

Warranty
Status: Covered under the terms of the BMW New Car Limited Warranty of 3 Years/36,000 Miles. Reimbursement will be provided through Campaign Entry.

Defect code: 00 12 01 06 00

Work package # 1 - 735i/735iL Replacing alternator pulley

Labor allowance: 2 FRU

Part Number Description Quantity

12 31 1 722 983 Pulley 1

Work package # 2 - 750iL Replacing pulley and fan wheel

Labor allowance: 3 FRU

Part Number Description Quantity

12 31 1 720 368 Pulley 1
12 31 1 725 734 Fan wheel 1