Engine - Screeching Noise On Cold Start Up
SI B 11 04 03Engine
February 2007
Technical Service
This Service Information bulletin supersedes S.I. B11 04 03 dated July 2005.
[NEW] designates changes to this revision
SUBJECT
NEW Noise Complaints From Mechanical Alternator Belt Tensioners
MODEL
E39 5 Series and E36 Z3 with M54 engine through end of production
E60 5 Series and E83 X3 with the M54 engine through current production
E53 X5 through with the M54 engine through 05/04 production
E46 3 Series with the M54 engine through 5/04 production
[NEW] SITUATION
Customer complains of the rattling or screeching noises upon cold start of the engine. The noise will usually dissipate after the engine warms up. Cold weather aggravates the condition. Noise comes from the area of a mechanical alternator belt tensioner.
CORRECTION
ON A CUSTOMER COMPLAINT BASIS ONLY, and only after the original mechanical belt tensioner in the vehicle has failed, replace the mechanical tensioner with the hydraulic style tensioner and install a new Ribbed V-Belt.
PROCEDURE
Perform preliminary alternator drive belt replacement steps as outlined in TIS repair instructions 11 28 010.
Relieve tension on the drive belt by rotating tensioner (1) in a clockwise direction. Remove alternator drive belt (2)
Remove bolt (2) and upper deflection pulley (1) and put aside.
Remove upper and lower mechanical belt tensioner bolts (2) and remove tensioner assembly (1)
Assemble new tensioner components as shown. Install bolt 8 (P/N 07 11 9 913 111) in position shown. Insert bolt 6 (07 11 9 901 785) and 7 ( 07 11 9 912 652) in preparation for installation on engine.
Install the assembly on the engine. Note: Hydraulic tensioner is held in place by 3 bolts. Upper bolt 6 ( 07 11 9 901 785) lower bolt 7 ( 07 11 9 912 652) and left side bolt 9 (07 11 9 913 111)
Install tensioner pulley (4) taking care to position the mudguard (#5) correctly. The dished portion faces to the front. Reinstall upper deflection pulley and install new belt in reverse of removal instructions.
PARTS INFORMATION
NEW WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty, Certified Pre-Owned BMW Limited Warranty, and the BMW Original Owner Protection Program (as applicable).
If there has been a prior replacement of the tensioner 24 months or less prior to the current repair (mechanical or hydraulic), and the vehicle is beyond the 4 year/50,000 mile New Vehicle Limited Warranty, but covered by either the BMW Certified Pre-Owned Limited Warranty or the BMW Original Owner Protection Program, please charge the current repair as a Parts Warranty (Type 2).
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