1997 MERCEDES-BENZ ML320 engine

GF18.40-P-4111-02A
Oil sensor function

n

P18.40-2046-12

B40
Oil sensor (oil level, temperature and quality)

2
Temperature sensor (PT1000)

A
Capacitive measuring range

C 1
Top condenser

C L
Capacitive air

C
OIL
Capacitive engine oil

C 2
Bottom condenser

h
Fill level

Oil level and oil quality are detected on the basis of the capacitance

of the engine oil (dielectric). The oil temperature is detected by the

temperature sensor. All the signals are processed in the electronics

to form a PWM signal and transferred to the engine control unit.

The measuring principle of the oil sensor is a capacitance

measurement, whereby the capacitance is dependent upon the oil

level. The measuring system consists of two cylinder condensers

which possess a metal pipe as a common external electrode. Both

other electrodes are arranged over each other as an inner pipe.

The dielectric constant of the engine oil is determined by the lower
condenser (C
2
) which is always full of oil (

e
approximately 2.3 to 4.0).
The fill level (h) is then determined by the upper condenser (C

1
)

using the dielectric constant. The capacitance of the upper

condenser (C
1
) is calculated on the basis of a parallel connection
with two condensers which have air and engine oil as a dielectric

material.

The condensers are located in a plastic housing which serves as a

damping cup. The engine oil flows through the feed bore holes into

the housing between the condensers.

The measuring range for the oil level is 80 mm

(normal level

F
40 mm), accuracy of measurement approx.

F
3 mm.

The voltage for the oil sensor (approx. 5 V) is supplied by the engine

control unit.

P07.61-0445-05

Signal assignment oil sensor

1
On/off ratio signals
Okay

A
Oil temperature
20 to 80%

B
Oil level
20 to 80%

C
Oil quality
20 to 80%

2
On/off ratio signals
>80 %

A
Oil temperature
> +160 °C

B
Oil level
>80 mm

C
Oil quality
e
>6

3
On/off ratio signals
<20 %

A
Oil temperature
< - 40 °C

B
Oil level
<0 mm

C
Oil quality
e
< 1

T
pulse duty factor
100 %

Each information block consists of three successive square-wave

signals, This is followed by a short pause.

A measured variable is assigned to each square-wave signal (A, B,

C). The quantisizing in each case is based on the on/off ratio (T) of
approx. 20 to 80 %.

Because oil level and oil quality (capacitance of the engine oil) are

dependent of each other, this information is first compensated for in

the engine control unit, before it is transmitted via CAN databus to

instrument cluster.

The following faults at the oil sensor are detected by the engine

control unit and entered in the fault memory:

- Duty cycle of a signal less than 17 % or more than 83 %

- Dielectric constant of engine oil longer than 100 seconds greater

than 5.8 (e.g. because of a lot of water in the engine oil).

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GF18.40-P-4111A
Oil sensor, location/task/design/function
15.10.96

ENGINE
111.951 /955 /956 /957 /982

ENGINE
112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /9 53 /954 /955
/970 /972 /973 /975

ENGINE
113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969

ENGINE
166.940 /960 /990 /995

P18.40-2104-11

Shown on engine 112, 113 in Model 129, 163, 170, 202, 208, 210,

215, 220
1
Electronics with 3-pin plug connection

B40
Oil sensor (oil level, temperature and quality)

A
Capacitive measuring range at sensor

C
Plug connection

Pin 1: output signal

Pin 2: GND

Pin 3: voltage supply
Oil sensor position
Motor 111.951/ 955

GF18.40-P-4111-01GS

M112113 in Model 129, 163, 170, 202, 208,

210, 215, 220 and model 203, 211with 4MATIC

GF18.40-P-4111-01A

M112, 113 in Model 203, 211 without 4MATIC

and model 209

GF18.40-P-4111-01AA

M166

GF18.40-P-4111-01GC

Oil sensor task
Detecting oil level, oil temperature, oil quality

Oil sensor design
The oil sensor consists of:

D
Electronics with 3-pin connector

D
Capacitive measuring elements

(condensers)

D
Temperature sensor.

Oil sensor function

GF18.40-P-4111-02A

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GF18.40-P-4111-01A
Oil sensor position

n

P18.40-0247-06

Location of oil sensor, engine 112, 113 in

model 129, 163, 170, 202, 208, 210, 215, 220

Model 203 with 4MATIC
Model 211 with 4MATIC

B40
Oil sensor (oil level, temperature

and quality)

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BB00.40-P-0229-03AMultigrade engine oils (Sheet 229.3)

For use in vehicles/engines refer to
#

Sheet 229.3
Sheet 223.2

BB00.40-P-0223-02A

For specified viscosity grades refer to
#

Sheet 224.1 (passenger-car engines)

BB00.40-P-0224-01A

Sheet 224.2 (commercial-vehicle

engines)

BB00.40-P-0224-02A

Product name
0W-300W-405W-305W-405W-50
Company, town, country

76 Pure Synthetic Motor Oil
X
ConocoPhillips, Costa Mesa, CA, USA

Addinol Extra light MV 038
X
Addinol Lube Oil GmbH, Leuna, Germany

Addinol Super light MV 0546
X
Addinol Lube Oil GmbH, Leuna, Germany

Addinol Super power MV 0537
X
Addinol Lube Oil GmbH, Leuna, Germany

Agip Eurosport
X
ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Extra HTS
X
ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Sint 2000 Evolution
XX
ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Sint Turbodiesel Evolution
X
ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Synthetic PC
X
ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Tecsint SL
X
ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Tecsint SX
X
ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Alpine topsynth
X
Mitan Mineralöl GmbH, Ankum, Germany

Antar Excellia LDX 5W40
X
Total Lubrifiants, Paris, France

AP Supreme Premium 9999 Synthetic
X
AP Oil International Ltd, Singapore, Singapore

Aral HighTronic
X
Aral Aktiengesellschaft, Hamburg, Germany

Aral SuperSynth
X
Aral Aktiengesellschaft, Hamburg, Germany

Aral SuperTronic
X
Aral Aktiengesellschaft, Hamburg, Germany

Aral SuperTronic G
X
Aral Aktiengesellschaft, Hamburg, Germany

Autol Carrera
X
Agip Schmiertechnik GmbH, Würzburg, Germany

Aviasynth
X
Avia Mineralöl-AG, Munich, Germany

Azmol Leader
X
Aot Azmol, Berdyansk, Ukraine

Blasol PSP 5W40
X
Blaser Swisslube AG, Hasle-Rüegsau, Switzerland

BP Euro Plus
X
BP p.I.c., London, England

BP Visco 5000
X
BP p.I.c., London, England

BP Visco 5000 Turbo Diesel
X
BP p.I.c., London, England

BP Visco 7000 GM
X
BP p.I.c., London, England

BP Visco 7000 Long Life
X
BP p.I.c., London, England

BP Visco 7000 Special
X
BP p.I.c., London, England

BP Visco 7000 Sport
X
BP p.I.c., London, England

Carl Motorenöl Power
X
Coparts Autoteile GmbH, Essen, Germany

Castrol Formula RS Motorsport 0W-40
X
Castrol Ltd., Swindon, England

Castrol Formula RS Road and Track
X
Castrol Ltd., Swindon, England

Castrol Formula SLX
X
Castrol Ltd., Swindon, England

Castrol Formula SLX LongTec
X
Castrol Ltd., Swindon, England

Castrol Formula SLX Turbo Diesel
X
Castrol Ltd., Swindon, England

Castrol GTX 7 Dynatec
X
Castrol Ltd., Swindon, England

Castrol Performance
X
Castrol Ltd., Swindon, England

Castrol Syntec 0W-30
X
Castrol Ltd., Swindon, England

Castrol Syntec 5W-40
X
Castrol Ltd., Swindon, England

Castrol TXT E.D.I. tec
X
Castrol Ltd., Swindon, England

Castrol TXT Softec
X
Castrol Ltd., Swindon, England

Castrol TXT Softec Plus
X
Castrol Ltd., Swindon, England

Cepsa Star Mega Synthetic
X
Cepsa Lubricantes, S.A., Madrid, Spain

Cepsa Star Mega Synthetic 0W-30
X
Cepsa Lubricantes, S.A., Madrid, Spain

CONCEP-TECH VS
X
Swd Lubricants GmbH & CO. KG, Duisburg, Germany

Consol Ultima
X
Vial Oil Ltd., Moscow, Russia

Cosmo Lio Royal
X
Cosmo Oil Lubricants Co., Ltd, Tokyo, Japan

CPC 9000 MB Motor Oil
X
Chinese Petroleum Corporation, Chia-Yi, Taiwan

DEA Ultec SYN-T
X
Shell & DEA Oil GmbH, Hamburg, Germany

Duckhams Q 5W40 Fully Synthetic
X
BP p.I.c., London, England

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GF54.30-P-4104A
Outside temperature display, location/function
8.7.99

MODEL
129

MODEL
140 as of 1.6.96

MODEL
170

MODEL
163, 202 with CODE (240a) Outside temperature display

MODEL
202 as of 1.8.96

MODEL
168

MODEL
208 up to 31.7.99,

210 as of 1.6.96 up to 30.6.99

To display the temperature, the
outside temperature indicator

A1p4
requires:

D
the outside temperature

D
the speed signal

D
the engine running time

and
D
the coolant temperature (model 129, and model 140 as of
1.6.96, model 170, model 202 as of 08/96 and model 163,

model 168, model 210)

The outside temperature is determined by the outside temperature

indicator temperature sensor B14. The temperature sensor is

installed at the front left of the vehicle under the bumper and

connected to the instrument cluster A1 via the 21 or 25-pin

connector, coding part A terminal 1 and 2.

The speed signal, engine running time and engine temperature are

determined internally by the instrument cluster A1.

Since the outside temperature display depends on the speed, engine

running time and coolant temperature, high temperatures (influenced

by the heat generated by the engine, for example) are not displayed

when the vehicle is stationary or moving slowly.
Function, model 202 until 08/95

When the ignition is switched on and off and at speeds below approx.

20 km/h, the last temperature measured is stored and displayed.

If the measured outside temperature drops below the stored value,

the current measured temperature is displayed.

If the outside temperature rises above the stored value, the current

measured outside temperature is displayed only after the following

delays:

D
When the engine is not running, the current outside

temperature is only displayed after 6 times the engine running

time. For example, if the preceding running time was 5 minutes,

the current temperature is not displayed until after 30 minutes.
The maximum delay, however, is 1 hour.

Up to 09.94

D
At vehicle speeds between 20-60 km/h, outside temperatures

are displayed after a delay of approx. 5 min.

D
At vehicle speeds over 60 km/h, outside temperatures are

displayed after a delay of approx. 2 minutes.

As of 09.94

D
At vehicle speeds between 20-45 km/h, outside temperatures

are displayed after a delay of approx. 3 min.

D
At vehicle speeds over 45 km/h, outside temperatures are

displayed after a delay of approx. 1.5 min.

Function

Model 129, model 140 as of 1.6.96, model 170, model 202 as of

08/96, model 163, model 168, model 208 and model 210

D
When the ignition is turned on or off

and with an engine temperature < 60°C

the current temperature is always stored and displayed.

D
When the ignition is turned off

and with an engine temperature < 60°C

the temperature last measured is stored and displayed.

D
When the ignition is turned on

and when an engine temperature < 60(C

The stored temperature is displayed.
If the measured outside temperature drops below the stored value,

the current measured temperature is displayed.

If the outside temperature rises above the stored value, the current

measured outside temperature is displayed only after the following

delays:

D
When the engine is not running, the current outside

temperature is only displayed after 6 times the engine running

time. For example, if the preceding running time was 5 minutes,

the current temperature is not displayed until after 30 minutes.
The maximum delay, however, is 1 hour.

D
At vehicle speeds between 20-45 km/h, outside temperatures

are displayed after a delay of approx. 3 minutes.

D
At vehicle speeds above 45 km/h, outside temperatures are

displayed after a delay of approx. 1.5 minutes.

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AR03.10-P-7311-01V
Measure end clearance of piston rings

Modification notes
12.6.02

Value in line 1001 for Engine 113.967 modified from

0.012...0.060 to 0.033...0.07 and from 0010...0.030 to

0.01...0.04
Value in BE03.10-P-1001-05B for Engine

113.967 modified

*BE03.10-P-1001-05B

Test values for piston rings

Number

Designation
Engine 112.910/

911/912
Engine 112.920/

921/922/923/940/
941/942/943/944/
945/946/947/948/

960,

113.940/941/942/

943
Engine 113.944/

980/981/982/984

BE03.10-P-1001-05B
Vertical clearance of

piston ring
Groove 1
mm
0,012...0,0600,012...0,0600,012...0,060

Groove 2
mm
0,010...0,0300,010...0,0300,010...0,030

Test values for piston rings

Number

Designation
Engine 113.960/

961/962/963/965/

968
Engine

113.967

BE03.10-P-1001-05B
Vertical clearance of

piston ring
Groove 1
mm
0,012...0,0600,033...0,070

Groove 2
mm
0,010...0,030
0,01...0,04

Commercially available tools
(see Workshop Equipment Manual)

Number

Designation
Make (e.g.)
Order number

WH58.30-Z-1008-12A
Feeler gage
Stiefelmayer

D-73734 Esslingen
59

P03.10-2034-01

1
Use the
feeler gage to measure end clearance of compression rings between

compression ring and mounting groove in the piston; replace compression rings or piston, if

necessary.

The end clearance of the oil scraper ring cannot be checked because of its three-part

design. If the compression rings are replaced, the oil scraper ring must also be replaced.

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AR03.10-P-7311-02V
Measure gap clearance of piston rings

Test values for piston rings
Number

Designation
Engine 112.910/

911/912
Engine 112.920/

921/922/923/940/
941/942/943/944/
945/946/947/948/

960,

113.940/941/942/

943
Engine 113.944/

980/981/982/984

BE03.10-P-1002-05B
Piston ring gap clearance
Groove 1
mm
0,200...0,3500,200...0,3500,200...0,350

Groove 2
mm
0,200...0,4000,200...0,4000,200...0,400

Test values for piston rings

Number

Designation
Engine 113.960/

961/ 962/ 963/

965/ 968/
Engine

113.967

BE03.10-P-1002-05B
Piston ring gap clearance
Groove 1
mm
0,200...0,3500,200...0,350

groove 2
mm
0,200...0,4000,200...0,400

Commercially available tools
(see Workshop Equipment Manual)

Number

Designation
Make (e.g.)
Order number

WH58.30-Z-1008-12A
Feeler gage
Stiefelmayer

D-73734 Esslingen
59

P03.10-2035-01

1
Clean cylinder contact surface.

2
Insert the two compression rings one after the other into the unworn area of the cylinder

wall and measure end clearance with

feeler gauge; replace piston rings, if necessary.

The gap clearance of the oil scraper ring cannot be checked because of its three-part

design. If the compression rings are replaced, the oil scraper ring must also be replaced.

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AR03.10-P-7311BV
Remove/install piston rings
2.7.97

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

ENGINE
112 /945, 113.962 /982

P03.10-2022-06

1
Compression ring (plain compression

ring)

2
Compression ring ( taper-faced hook

scraper ring)

3
Oil scraper ring

4
Piston

5
Piston crown

Fig. item, etc.

Work instructions

4
Remove/install pistons

AR03.10-P-7021AV

1, 2, 3
Piston rings
transmission


Pliers

*000589513700


Removal:

Oil scraper ring
with the pliers.

The oil scraper ring (3)
must be removed and

installed by hand.


Installation:
Compression rings
-
Measure width of compression rings (1, 2).

*BE03.10-P-1003-05B

-
Pay attention to installation position of

compression rings (1, 2). The inscription


"Top" or the manufacturer's designation
must
point toward the piston crown (5).

1, 2
Measure the side clearance of the

compression rings

AR03.10-P-7311-01V

1, 2
Measure end gap of the compression rings

AR03.10-P-7311-02V

Test values for piston rings

Number

Designation
Engine 112.910/

911/912
Engine 112.913
Engine 112.920/

921/922/923/940/
941/942/943/944/
945/946/947/948/

960,

113.940/941/942/

943

BE03.10-P-1003-05B
Dimension
Plain compression ring
mm
83.2 X 1.5 X 3.189.9 X 1.5 X 3.189.9 X 1.5 X 3.1

Taper-faced hook

scraper ring
mm
83.2 X 3.5 X 3.5
89.9 X 1.75 X 3.5
89.9 X 3.5 X 3.5

Test values for piston rings

Number

Designation
Engine 112.949

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Page 1