Alternator Fan & Pulley - Installation

REF. NO. MBNA 13/2a, 15/15a

To: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: March 1988 (supersedes 13/2,15/5)

SUBJECT:
ALTERNATOR FAN AND PULLEY INSTALLATION
ALL ENGINES WITH SINGLE BELT DRIVE

Note:
Please discard your copy of S.I. MBNA 13/2, 15/5 (Nov. 1987). The production date has changed and the tightening procedure and torque have been revised.





With the introduction of the poly-V-belt, a woodruff key is no longer used to attach the fan and pulley to the alternator shaft (e.g. alternator, part no. 007 154 54 02). These alternators can be identified by a shorter shaft, on which the keyway is not totally visible (Figure 1).

As of May 1987 production (manufacturer's code 745), the pulley and nut are made of an improved material to lessen the chance of the nut coming loose; and the tightening procedure was changed.

In case of customer complaints on earlier production vehicles regarding the pulley/nut carting loose, replace the alternator, pulley and nut. Lubricate the threads and face of the nut with oil and tighten to 70 5 Nm

To tighten the shaft nut, use a 1/2" drive torque wrench with an 8mm Allen key to fit into the alternator shaft. Use a 22mm offset box wrench to hold the pulley nut in place.

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