Mercedes-Benz ML320. Manual — part 422

Fig. 82: Identifying Valve Springs And / Or Valve Stem Seal Components - Shown On Engine 112 (1 Of
2)

Shown on engine 112

Shown on engine 112

2004 Mercedes-Benz ML350

1998-2005 ENGINE Engine timing - 163 Chassis

me

Fig. 83: Identifying Valve Springs And / Or Valve Stem Seal Components - Shown On Engine 112 (2 Of
2)

Remove/install

1

Remove engine cover or
air filter

Remove engine trim
panel or air filter by
pulling it vertically up
and off the cylinder head
covers.

2

Remove viscous fan (1)

Right-hand thread!

AR20.40-P-5660C

3

Fan shroud (2)

On model 163

unscrew bolts at bottom
of fan shroud.

Models 163.

AR20.40-P-5000GH

Model 463.

AR20.40-P-6800V

4

Remove poly-V-belt (3)

Installation: Lock

tensioning device with a
drift or pin (diameter 5
mm).

AR13.22-P-1202B

5

Remove cylinder head
covers (6)

Air filter located at
vehicle side.

AR01.20-P-5014B

Air filter located on
engine side.

AR01.20-P-5014BV

6

Remove spark plugs (8)

Only one spark plug at

each cylinder.

Models 163.

AP15.10-P-1580GH

Models 129, 202, 208,
210.

AP15.10-P-1580A

Model 463.

AP15.10-P-1580GA

7

Remove intake manifold
(7)

The intake manifold

system must not be
disassembled.

Remove intake

manifold together with
fuel rail.

Models 129, 163, 202,
208, 210.

AR09.20-P-1310A

Model 463.

AR09.20-P-1310AG

8

Position crankshaft to 40°
after ignition TDC of
cylinder 1

Engine must not be

cranked back!

AR05.10-P-6858V

9

Remove chain tensioner
(5)

AR05.10-P-7800C

10

Remove camshaft

AR15.10-P-2000A

2004 Mercedes-Benz ML350

1998-2005 ENGINE Engine timing - 163 Chassis

me

position sensor (11)

11

Remove camshaft
sprockets (10)

Lock right and left

camshaft with locating
plates.

Locating plate

Fig. 11

Locating plate

Fig. 12

Open-end wrench

Fig. 22

Insertion tool

Fig. 66

Torque wrench

001589722100

*BA05.20-P-1001-01B

After installation: ?

Inspect timing of engine. AR05.10-P-6858V
? If necessary after
checking:

Set basic position of
camshafts.

AR05.20-P-6020AU

12

Remove camshaft bearing
bridges (9)

Engines 112, 113 except
code (479) Cylinder
shutoff.

AR05.20-P-7103AU

Engine 113 with code
(479) cylinder shutoff.

AR05.20-P-7103AV

13

Position piston of cylinder
to be processed to TDC

Crank engine at

crankshaft for this
purpose and hold up
timing chain (so that it
does not jam).

Installation: Before

installing the camshaft
sprockets, again turn
back the crankshaft in the
starting position to 40 °
as per ignition TDC at
the first cylinder.

14

Install retaining lock (13)
for crankshaft

After setting TDC of

cylinder to be processed,
in order to prevent
crankshaft turning
further.

AR03.30-P-5000B

15

Connect up cylinder leak
tester (12)

Turn connection

hose of cylinder leak
tester into the relevant
spark plug hole.

*WH58.30-Z-1015-05A

16

Pressurize compression
chamber

With a pressure of about
5 bar.

2004 Mercedes-Benz ML350

1998-2005 ENGINE Engine timing - 163 Chassis

me

Camshaft

17

Screw retaining fork and
detent with hinged
bearing into cylinder head

Valve assembly tools

case

Fig. 89

18

Attach detent depressor
with lever handle and
thrust piece into detent
with hinged bearing, align

Position thrust piece

vertically at valve spring
retainer and align parallel
to detent with hinged
bearing.

Valve assembly tools

case

Fig. 89

19

Remove upper valve
spring plate (16) and
valve spring (17)

Do not allow valves to

touch the piston crowns
otherwise they will be
bent.

Compress valve

spring and remove valve
collets with tweezers or
magnetic finger. The
valve springs of the inlet
and exhaust valves are
identical.

Magnetic finger

Fig. 90

Tweezers

*WH58.30-Z-1040-02A

20

Replace valve stem seals
(18)

Inspect surface of

valve stems for
roughness and formation
of burrs (visual
inspection or with a nail).
Replace valves with a
rough stem surface or
formation of burrs: ?

AR05.30-P-3500-02A

Remove valves.

AR05.30-P-3511AV

21

Remove lower valve
spring plate (19)

Checking

22

Inspect top and bottom
valve spring retainers (16,
19)

Inspect valve spring

retainer for formation of
burrs, replace if
necessary.

23

Install in the reverse order

Number

Designation

Engine
112

Engines
113.940/941/

2004 Mercedes-Benz ML350

1998-2005 ENGINE Engine timing - 163 Chassis

me