Rear axle - oil change

AP35.00-P-3501A

Rear axle - oil change

18.02.2020

Model

117, 156, 176, 246

with code M005 (Vehicles with 4MATIC/all-wheel drive)

Shown on model 117.302

1

Differential

2

Filling screw

3

Drain screw

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

 Caution

Risk of injury to skin and eyes due to handling of transmission oil. Health risk caused by swallowing transmission oil

Wear protective gloves, protective clothing and safety glasses.
Do not pour transmission oil into beverage bottles.

AS00.40-Z-0001-01A

Preparatory activity

1

Lift vehicle with lifting platform.



AR00.60-P-1006A


Vehicle must be horizontal.
Otherwise the differential (1) will not be filled correctly and an incorrect oil filling capacity can lead to fluid loss and damage.

 The automatic selector lever must be in position "N". The parking brake must not be applied.



Clean

2

Clean area surrounding drain screw (3) and filling screw (2).



Remove

3

Unscrew filling screw (2) and remove seal.

4

Unscrew drain screw (3) and remove seal.

Drain off

5

Drain oil from differential(1).

6

Turn both rear wheels five revolutions simultaneously in direction of travel.


The front wheels must remain stationary.
Otherwise not all of the oil will be drained from the differential (1).

 The automatic selector lever must be in position "N". The parking brake must not be applied.



Clean

7

Clean drain screw (3) and threaded hole in differential (1).

Loctite 7063 (400 ml) cleaning spray

*BR00.45-Z-1046-04A



Install

8

Screw drain screw (3) with new seal into differential (1).


Replace seal of drain screw (3).
Otherwise fluid loss and damage may occur.


Pay attention to the correct tightening torque.
Damage can otherwise occur.

 Filling screw/drain screw to differential

*BA35.31-P-1003-02J

Pour in

9

Pour oil into differential (1) up to lower edge of filler hole.

 Filling capacity

*BF35.31-P-1001-01A

 Hand pump

*210589007100



Clean

10

Clean filling screw (2) as well as filler hole in differential (1).

Loctite 7063 (400 ml) cleaning spray

*BR00.45-Z-1046-04A



Install

11

Screw filling screw (2) with new seal into differential (1).


Replace seal of filling screw (2).
Otherwise fluid loss and damage may occur.


Pay attention to the correct tightening torque.
Damage can otherwise occur.

 Filling screw/drain screw to differential

*BA35.31-P-1003-02J

12

Lower vehicle with vehicle lift.



AR00.60-P-1006A

Reset service data and perform function test

13

Connect diagnostic system.



AD00.00-P-2000-04A

14

Reset rear axle oil service data.

 Resetting of the service data is called up in the diagnostic system as follows:
Select "all-wheel drive transfer case" control unit (N45) 
Select menu item "Adaptations" 
Select menu item "Teach-in processes" 
Select menu item "Control unit" 
Select menu item "Reset oil service data".

15

Use diagnostic system to perform function test of component "All-wheel drive solenoid valve (Y68/3)" when driving.


A curve must be driven.
Otherwise the brief jolt may not be felt and the function test of component "All-wheel drive solenoid valve (Y68/3)" cannot be correctly performed.


When performing actuation, a brief jolt must be felt in the vehicle; this ensures that the entire differential (1) is correctly filled with oil.
Damage can otherwise occur.


If after even 10 actuations a brief jolt is not perceptible.
Perform operation steps 16 to 22, and then start again at operation step 13.

16

Disconnect diagnostic system.



Remove

17

Lift vehicle with lifting platform.



AR00.60-P-1006A


Vehicle must be horizontal.
Otherwise the differential (1) will not be filled correctly and an incorrect oil filling capacity can lead to fluid loss and damage.

18

Unscrew filling screw (2) and remove seal.



Check

19

Check whether oil in differential (1) is at lower edge of filling hole.

 Filling capacity

*BF35.31-P-1001-01A

 Hand pump

*210589007100

If oil is not at lower edge of filling hole,



Pour oil into differential (1) up to lower edge of filler hole.



Clean

20

Clean filling screw (2) as well as filler hole in differential (1).

Loctite 7063 (400 ml) cleaning spray

*BR00.45-Z-1046-04A



Install

21

Screw in filling screw (2) with new seal.


Replace seal of filling screw (2).
Otherwise fluid loss and damage may occur.


Pay attention to the correct tightening torque.
Damage can otherwise occur.

 Filling screw/drain screw to differential

*BA35.31-P-1003-02J

Finishing activity

22

Lower vehicle with vehicle lift.



AR00.60-P-1006A

 Rear axle differential housing

Number

Designation

Model 117

Model 156

BA35.31-P-1003-02J

Filling screw/drain screw to differential

Nm

15

15

 Rear axle differential housing

Number

Designation

Model 176

Model 246

BA35.31-P-1003-02J

Filling screw/drain screw to differential

Nm

15

15

 Rear axle differential

Number

Designation

MODEL 117, 4MATIC

MODEL 156, 4MATIC

BF35.31-P-1001-01A

Filling capacity

Rear axle differential

Liter

0,740

0,740

Sheet

BB00.40-P-0235-62A

BB00.40-P-0235-62A

Sheet

-

-

 Rear axle differential

Number

Designation

MODEL 176, 4MATIC

MODEL 246, 4MATIC

BF35.31-P-1001-01A

Filling capacity

Rear axle differential

Liter

0,740

0,740

Sheet

BB00.40-P-0235-62A

BB00.40-P-0235-62A

Sheet

-

-

Repair materials

Number

Designation

Order number

BR00.45-Z-1046-04A

Loctite 7063 (400 ml) cleaning spray

A 001 986 71 71 09