Mercedes-Benz ML320. Manual — part 439

Compression pressure

least 8 revolutions.

10

Carry out test procedure
at the remaining cylinders
in the same way

11

Compare measurements
obtained with the
specified pressures

*BE01.00-P-1001-01D
*BE01.00-P-1002-01D
*BE01.00-P-1003-01D

If necessary, if the
pressure is below the
minimum compression
pressure or if permissible
difference between
individual cylinders is
exceeded:?

Inspect cylinders for
leaks

AR01.00-P-1300HV

12

Install in the reverse
order

Number

Designation

Engines 112.910/
911/912/920/921/923/940/941/
942/943/960, 113.940/942/
943/961/963 low compression

Engines 112.910/
911/920/921/
922/923/940/
941/942/943/
944/945/946/947,
113.940/941/942/
943/960/961/962/
963/965/968/969
normal
compression

Engine
113.944
Standard
compression

BE01.00-
P-1001-
01D

Compression
installation
tolerance or
new value

bar

10...12

12 to 14

11 to 13

BE01.00-
P-1002-
01D

Compression
pressure wear
limit or limit
value

bar

8.0

9.0

10.0

BE01.00-
P-1003-
01D

Compression
pressure
permissible
difference
between
individual
cylinders

bar

1.5

1.5

1.5

2001 Mercedes-Benz ML320

1998-2005 ENGINE Complete engine - 163 Chassis

me

Compression pressure

Fig. 19: Identifying Compression Recorder (001 589 76 21 00)

TESTING COMPRESSION PRESSURE - AR01.00-P-1200V

ENGINE 112

Air filter motor page arranged

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

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

Number

Designation

Engines 113.980/
981/982/984 Standard
compression

Engine
113.992/995

Engine
113.992/995
990/991/993

BE01.00-P-
1001-01D

Compression installation
tolerance or new value

bar 11 to 13

11 to 13

9 to 12

BE01.00-P-
1002-01D

Compression pressure wear
limit or limit value

bar 10.0

8.0

8.0

BE01.00-P-
1003-01D

Compression pressure
permissible difference
between individual cylinders

bar 1.5

1.5

1.5

2001 Mercedes-Benz ML320

1998-2005 ENGINE Complete engine - 163 Chassis

me

Fig. 20: Identifying Compression Recorder Assembly

Remove/install

Risk of accident caused
by vehicle starting off by
itself when engine is
running. Risk of injury
caused by contusions and
burns during starting
procedure or when
working near the running
engine

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

AS00.00-Z-0005-01A

1

Bring engine to
operating temperature
(approx. 80°C)

Test compression pressure only

when engine is at normal
operating temperature.

2

Remove air filter
housing

All except model 203.065/265,
170.466: ?

Detach the air filter housing

from the rubber retainers at the
cylinder head covers vertically
upward.

Models 211, 220, 230.475:

Unclip engine front end cover.

Installation: Rub the retaining

rubbers on the cylinder head

2001 Mercedes-Benz ML320

1998-2005 ENGINE Complete engine - 163 Chassis

me

covers and sealing ring of the hot
film air mass sensor in the air
filter housing with lubricant.
Models 230.474, 203.065/265,
170.466

AR09.10-P-1150SVK

Lubricant

*BR00.45-Z-1002-
06A

3

Remove spark plugs

Remove only one spark plug

per cylinder: ?

Models
463.209 /232 /233 /244 /245 /250
with engine 112.945.

AP15.10-P-1580GA

Models
463.206 /240 /241 /247 /248 /
249 /254 with Engine 113.962.

Models 463.243 /246 with Engine
113.982

Models 211, 220, 230.474/475

AP15.10-P-1580AB

Models 210, 208, 203, 202, 170,
129

AP15.10-P-1580A

4.1

Remove key from
electronic ignition switch
(EIS)

Models 211,230.474/475

Vehicles with code (889)

Keyless Go: Press the start/stop
button repeatedly until the ignition
is switched off.

5

Crank engine with
starter.

Do not crank engine at steering

lock but use contact switch of the
compression recorder.

In order to remove the

combustion residue from the
cylinders, crank the engine for
about 5 seconds with the starter.

All except model 203

AR01.10-P-0110V

Model 203

AR01.10-P-0110PV

Checking

6

Insert compression tester
into spark plug bore

Compression recorder

Fig. 21

7

Open throttle valve

Except models 211, 230.474/475

8

Crank engine with
starter.

Do not crank engine at steering

lock but use contact switch of the
compression recorder.

All except model 203

AR01.10-P-0110V

Model 203

AR01.10-P-0110PV

2001 Mercedes-Benz ML320

1998-2005 ENGINE Complete engine - 163 Chassis

me