Camshaft Timing Adjuster - Revised Mounting Bolts

91mercedes04

REF. NO. MBNA 05/6a


TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: September 1991


SUBJECT: ENGINES 104.980/981 MOUNTING BOLTS FOR CAMSHAFT TIMING ADJUSTER


Note: This Service Information includes revised Parts Information.

Figure 1:

Figure 2:

As of 5/91 and the effective serial numbers below, the mounting bolts (item 15a, Figures 1 and 2) for the camshaft timing adjuster have been modified. Torx screw T30 is now used (item 15c [M7 x 13.5], Figures 1 and 2) instead of the previous hex. head screw (M7 x 11.6).


Effective Serial Number

Engine Transmission Engine End Number

104.980 Automatic 023614
104.981 Manual 001035
104.981 Automatic 010154


When performing repairs requiring the removal of the camshaft timing adjuster, use only the Torx screws (see table on page 2 for parts application).

Tightening Torque: 22 N-m


Parts Information

Part Name Part Number Camshaft timing adjuster Intake camshaft flange
Mounting holes "d" Dimension "e"

(15a) Hex. head screw 104 990 03 22 With countersink 6.8 mm (1)
(M7 x 11.6)

(15b) Torx screw 104 990 05 04 Without countersink 6.8 mm (2)
T30 (M7 x 12.4)

(15c) Torx screw 120 990 01 04 Without countersink 7.8 mm (3)
T30 (M7 x 13.5)

1) Dimension "e" 6.8 mm on all camshaft versions of engine 104.98 up to 5/91.
2) Dimension "e" 7.8 mm on engine 104.98 as of 5/91.
3) Engine 104.990 from beginning of production.

Figure 2:

Note:
1. Hex. head screw (15a, Figure 2) is not to be reinstalled during repairs.
2. Torx screw T30 (15b, Figure 2) to be used as replacement of Hex. head screw (15a, Figure 2).
3. If originally equipped with Torx screw T30 (15c, Figure 2), must be replaced with same.