Mercedes-Benz 201.024, Service Manual

Page: 22 / 304

4
Top off coolant and leave filler opening at
coolant expansion tank open.
5 Remove oil filler cap.
6 Remove air filter (09-400 or
7 Connect cylinder leaktightness tester to a
compressed air system and calibrate tester.
8
Position piston of No. 1 cylinder to ignition
TDC. This is done by turning the crankshaft with
a tool combination consisting of wrench socket
(27 mm, square) and reversible ratchet
handle, at the central bolt (front of crankshaft).
Note
The respective pistons are in the TDC position
when the markings shown in the drawing
opposite on the vibration damper or on the belt
pulley are below the TDC pointer.
9 Open throttle fully.
10 Screw connection hose into the 1 spark
plug bore and attach to the connecting hose of
the tester.
The crankshaft must not turn when performing
this step.
11 Read off pressure loss at tester.
12 Determine by listening whether the pressure
escapes through intake manifold, exhaust, oil
filler opening, spark plug bore of adjacent
cylinder or coolant filler opening.
13 Test all the cylinders in the firing order.
01.0904