Camshaft - Updated Replacement Part

90mercedes02
TO: OUR MERCEDES BENZ PASSENGER CAR DEALERS

DATE: June 1990 (supersedes 05/80, Jan. 1990)


SUBJECT: CHILLED CAST IRON CAMSHAFT ENGINE M103
REF. NO. 05/80a
Note: This S.I. contains additional replacement information (first paragraph, page 2 and Parts Information).

As of March 1989, a camshaft made frcm chilled cast iron and rocker arms with carbide inserts are installed in production.


Effective Serial

Model Engine End Number
Manual Automatic


124.026 103.940 025793 061591
124.030 103.983 - 149943
124.050 103.983 - 149943
124.090 103.983 - 149943
126.024/025 103.981 - 079773
201.029 103.942 013206 024478

Figure 1:

Engine with the chilled cast iron camshaft and rocker arms with carbide inserts are recognizable by the letter "S" stamped onto the exhaust side of the cylinder head (arrow, Figure 1).

In case of repairs only the chilled cast iron camshaft may be installed.

Figure 2:

When installing the chilled cast iron camshaft and rocker arms with carbide inserts into earlier production vehicles, a modified ignition distributor rotor bracket (11) and T30 M 7x26 torx head screw (16) must also be installed. In vehicles produced prior to 4/86, the camshaft gear (19) and its three mounting bolts should also be replaced due to en change in the mounting bolt bore size from 6 to 7 mm (Figure 2).

The camshaft, rocker arms with carbide inserts, and modified ignition distributor rotor bracket with torx head screw must be installed together at the same time.

Also inspect the rocker arm shafts for damage or wear and replace if necessary.

Ensure that the cans are properly and completely lubricated during installation to prevent any "dry running time" after shifting the engine. This precaution applies to any camshaft installation.

Figure 1:

After subsequent installation, mark the worst side of the cylinder head with the letter "S" as shown in figure 1.
Tightening Torques


Ccmponent


Torque


Rocker arm bearug bracket 21 N-m
Ignition distributor rotor bracket 16 N-m
Camshaft gear 16 N-m
Valve cover 9 N-m


Use of a new installation sleeve is required to install the front cover.
Special Tool Information


Tool Name Tool Number Group/Category Price


Sleeve 103 589 01 14 00 01/C 24.78

* Subject to change without notice


Parts Information


Part Name Part Number


Camshaft 103 050 64 01 (Code # 53)
Rocker arm 103 050 10 33
Ignition distributor rotor bracket 103 158 08 40 opt. with 103 158 07 40
Torx head screw 103 990 01 22
Camshaft gear 103 052 06 01
Camshaft gear mounting bolts 103 990 00 22


In Case of Warranty:

Time Allowance

Refer to latest Time Guide microfiche


Damage Codes

05002 08 Camshaft and rocker arm; wear