CHECKING COMPRESSION OF ALL CYLINDERS
Remove fuse no. 1 (fuel pump) to avoid flooding
by constant ejection of the fuel injectors
while operating the starter.

Unscrew spark plugs.
Measure compression¹).


¹) See Specifications

Vehicles after change point in 1982
CHECKING COMPRESSION OF
ALL CYLINDERS
M 30 B 32:
Pull off relay (1).

Pull off plug (2) and lift out wires.
Pull out hoses (3 and 4).
Loosen hose clamp (5).
Disconnect wire.
Unscrew nuts (6) and remove air cleaner with air flow sensor.

M 30 B 34:
Pull off relay (1).

Pull off plug (2) and lift out wires.
Loosen hose champ (3).
Disconnect wire (4).
Pull off hose (5).
Open clamp (6).
Unscrew nuts (7) and remove air cleaner with air flow sensor.

Unscrew spark plugs.
Check compression*.
Installation:
Tightening torque***.


*See Specifications
***See Specifications of Gr. 12