1986 TUNE-UP
Mercedes-Benz 6-Cylinder
IDENTIFICATION
ENGINE IDENTIFICATION

First six digits of engine identification number, located on a tag at left rear side of engine crankcase, identify engine.

ENGINE CODE
Application Code
300 E 103.983
TESTING
ENGINE COMPRESSION

Check compression pressure with engine at normal operating temperature, throttle valve fully open and all spark plugs removed. Crank engine at least 8 revolutions per cylinder.

COMPRESSION RATIO
Application Specification
300 E 9.2:1
SPARK PLUGS

SPARK PLUG TYPE
Application Bosch Champion
300 E H7DC S12YC

SPARK PLUG SPECIFICATIONS
Application Gap: In. (mm) Torque: Ft. Lbs. (N.m)
300 E .032 (.80) 15 (20)
HIGH TENSION WIRE RESISTANCE

Carefully remove high tension wires from spark plugs and distributor cap. Using an ohmmeter, check resistance of wires while gently twisting wire. Resistance should be 25,000-30,000 ohms. If resistance is incorrect or fluctuates from infinity to any value, replace wire(s).
ADJUSTMENTS
VALVE CLEARANCE

The valve clearance is compensated for by a hydraulic mechanism located within the rocker arm. No adjustment is required as the rocker arms are continuously in contact with the cam lobes.
VALVE ARRANGEMENT

* Right Side - All Exhaust.
* Left Side - All Intake.