Mercedes-Benz ML320. Service manual — part 441

Fig. 29: Identifying Firing Order (Engines 137,275,285)

INSPECT CYLINDERS FOR LEAKS - AR01.00-P-1300HV

ENGINE 112,137,285

ENGINE 112.945 in MODEL 463.209 /232 /233 /244 /245 /250

ENGINE 113.962 in MODEL 463.206 /240 /241 /247 /248 /249 /254

ENGINE 113.982 in MODEL 463.243/246

ENGINE 113 (except 113.995) in MODEL 129, 163, 202, 203, 208, 209, 210, 211, 215, 220, 230

2001 Mercedes-Benz ML320

1998-2005 ENGINE Complete engine - 163 Chassis

me

Fig. 30: Identifying Components For Inspecting Cylinders For Leaks

Shown on Engine 112

Remove, Install

1

Risk of accident from
vehicle starting off by
itself when engine
running. Risk of injury
suffered in the form of
bruises or burns to the
hands when reaching in
while the engine cranks
or runs
Bring engine to operating
temperature (approx. 80 °
C)

Secure vehicle to prevent it
from moving off by itself.
Wear closed and close-
fitting work clothes.
Do not grasp hot or rotating
parts.

Check the cylinder for

leaks only when the engine
is at normal operating
temperature.

AS00.00-Z-0005-01A

Risk of injury to skin
and eyes suffering
scalding from contact
with hot coolant spray.
Risk of poisoning from
swallowing coolant.

Do not open cooling system
unless coolant temperature
is below 90 °C. Open cap
slowly and release the
pressure. Do not pour
coolant into beverage
bottles.
Wear protective gloves,
protective clothing and eye
protection.

AS20.00-Z-0001-01A

2

Open cap (2) of
expansion reservoir

In Model 463 with Engine
112, 113, a cap (2) with a
detent is built-in

Turn cap carefully up to the
first pre-detent, relieve the
pressure and then unscrew
the cap (2).

A 1-stage cap is fitted to

Model 163 with Engine
112, 113.

Turn the 1-stage and 2-

stage cap half a revolution
counterclockwise, relieve
the pressure, then unscrew
the 1-stage or 2-stage cover.

3

Remove a spark plug
(19) from each cylinder

Model 202, 208, 209, 210
with Engine 112, 113.

AP15.10-P-1580A

2001 Mercedes-Benz ML320

1998-2005 ENGINE Complete engine - 163 Chassis

me

Model 203, 170 with
Engine 112.

Model 163 with Engine
112, 113.

AP15.10-P-1580GH

Model 215, 220 with
Engine 137.

AP15.10-P-1580L

Model 230.474/475, 211,
220 with Engine 112, 113

AP15.10-P-1580AB

Model 240 with Engine
285.

AP15.10-P-1580H

Model 463 with Engine
112,113

AP15.10-P-1580GA

4

Position piston of
cylinder to be tested to
ignition TDC

Crank the engine at the

center bolt of the crankshaft
in the direction of rotation
of engine.

5

Connect cylinder leak
tester (04)

Calibrate cylinder

leakage tester (04) and
screw the connection hose
into the spark plug bore

Cylinder leak tester

*WH58.30-Z-1015-05A

6

Remove the oil filler cap
(3)

Inspection

7

Apply compressed air to
the cylinder, read off
pressure loss on the
cylinder leakage tester
(04) and determine the
cause if there is an
increased pressure loss

Cylinder leaktightness
permissible loss total
indication

*BE01.00-P-1001-02Z

Cylinder leaktightness
permissible losses at valves
and cylinder head gasket

*BE01.00-P-1002-02Z

Cylinder leaktightness
permissible losses at pistons
and piston rings

*BE01.00-P-1003-02Z

If the crankshaft rotates: ?

Engine 112, 113, 137.
Install retaining lock for
crankshaft

AR03.30-P-5000B

Engine 285.
Lock crankshaft with
counterholder.

Retainer

Fig. 31

8

Conduct the test of the
other cylinders in the
firing order of the engine

AR01.00-P-1300-03HA

9

Install in the reverse

2001 Mercedes-Benz ML320

1998-2005 ENGINE Complete engine - 163 Chassis

me

Cylinder leakage

Fig. 31: Identifying Counterholder (112 589 00 40 00)

Commercially available tools

DISCONNECTING AND CONNECTING ENGINE WIRING HARNESS - AR01.00-P-2410V

ENGINE 112.942 in MODEL 163.154

ENGINE 112.970 in MODEL 163.157

ENGINE 113.942 in MODEL 163.172

ENGINE 113.981 in MODEL 163.174

ENGINE 113.965 in MODEL 163.175

Shown on Model 163.154

order

Number

Designation

All Engines

BE01.00-P-1001-02Z

Cylinder leakage
permissible loss total
indication

% < or = 25

BE01.00-P-1002-02Z

Cylinder leakage
permissible losses at valves
and cylinder head gasket

% < or = 10

BE01.00-P-1003-02Z

Cylinder leakage
permissible losses at
pistons and piston rings

% < or = 20

Number

Designation

WH58.30-Z-1015-05A

Cylinder leakage testing unit

2001 Mercedes-Benz ML320

1998-2005 ENGINE Complete engine - 163 Chassis

me