Mercedes-Benz ML320. Manual — part 130

AR83.25-P-1405GH

Remove/install cover at air intake

3.3.97

MODEL

163.113 /128 /136 /154 /157 /172 /174 /175

P83.25-2012-06

1

Windshield wiper arms

2

Rubber seal

3

Cover

4

Nuts

5

Metal clips

6

Water deflector panel

Remove/install

Danger!

Injury hazard by trapping or crushing, in
extreme cases with loss of limbs when
reaching into windshield wiper mechanism

Always remove ignition key when working on
windshield wiper mechanism.

AS82.30-Z-0001-01A

1

Remove wiper arms (1)

AR82.30-P-6100GH

2

Detach rubber seal (2) from firewall

3

Remove metal clips (5)

4

Unscrew nuts (4) at firewall

Remove foam insert.

5

Seal off washer fluid hose at check valve

6

Remove cover (3) together with water
deflector panel (6)

If damaged, detach water deflector panel

(6) from cover (3).

Installation: Lubricate upper edge of

cover and windshield at bottom with soapy
water.

7

Install in the reverse order

Copyright DaimlerChrysler AG 09.05.2006 CD-Ausgabe G/10/04 . This WIS print-out will not be recorded by Modification services.

Page 1

1998-2005 ENGINE

Air Intake, Turbo Charging - 163 Chassis

BASIC KNOWLEDGE

AIR INTAKE, FUNCTION - GF09.00-P-3000A

ENGINE 112 (except 112.960 /961) without supercharger

Fig. 1: Identifying Air Intake Components - Without Supercharger

INTAKE MANIFOLD, LOCATION - GF09.20-P-3102-01A

Shown on ENGINE 113

Purpose

Reducing intake noises

Design/function

A Helmholtz resonator (branching filter) with a volume of about 0.6 liters, is installed
to reduce the intake noises. This is active in the engine speed range from approx. 3500
- 4500 rpm. As a side effect the air flow in this engine speed range is improved at the
hot film mass air flow sensor and the measurement of the air mass is thus more
accurate.

2001 Mercedes-Benz ML320

1998-2005 ENGINE Air Intake, Turbo Charging - 163 Chassis

2001 Mercedes-Benz ML320

1998-2005 ENGINE Air Intake, Turbo Charging - 163 Chassis

me

me

Fig. 2: Identifying Variable Intake Manifold - Shown On Engine 113

INTAKE MANIFOLD, FUNCTION - GF09.20-P-3102-02A

Engine 112, 113

Section through variable intake manifold in cylinder plane

Fig. 3: Identifying Intake Manifold Function - Section Through Variable Intake Manifold In Cylinder
Plane

When the engine is started and at low engine speeds the variable flaps are open. The intake air flows along the
shortest path and thus reaches the cylinder with low friction losses from the distributor volume.

At an engine load of more than 50% from approx. 1750 rpm up to approx. 3900 rpm the variable flaps are

2001 Mercedes-Benz ML320

1998-2005 ENGINE Air Intake, Turbo Charging - 163 Chassis

me

closed. The intake air must flow through the whole intake pipe. Its length is selected in such a way that the
pressure waves, produced by the inducting pistons, arrive at the right moment at the open intake valves for the
next induction stroke. The result is improved cylinder charge and thus an increase in torque.

At higher engine speeds (e.g. from 3900 rpm) the actuation to the variable intake manifold switchover valve is
interrupted - the variable flaps open as a result of the spring force. Through the shortened route the pressure
waves arrive in time even at higher rotational speeds before the closing of the intake valves to the combustion
chamber.

INTAKE MANIFOLD, DESIGN - GF09.20-P-3102-03A

Shown on ENGINE 112

Fig. 4: Identifying Intake Manifold Components - Shown On Engine 112

The intake manifold is assembled out of several magnesium pressure castings. When fitted together, they
produce the individual intake manifolds and the air collecting volume. The parts are sealed off to each other by
plastic. The intake manifold cannot be disassembled.

The individual intake manifolds each approx. 800 mm long, are arranged in a spiral shape around the air
collecting volume. A single intake manifold is assigned to each cylinder.

Each single intake manifold has a further opening to the air collecting volume in the middle. These can be
opened or closed by means of variable flaps which pivot through approx. 60°.

The variable flaps are attached to steel shafts. One shaft is installed for each bank of cylinders. The

2001 Mercedes-Benz ML320

1998-2005 ENGINE Air Intake, Turbo Charging - 163 Chassis

me