Remove/install fan unit

AR20.40-P-5050RFW

Remove/install fan unit

28.11.2018

Engine

780 in model 253.992/993

1

Fuel cell cover

1a

Intake air duct

1b

Expansion rivet

1c

Expansion rivet

1d

Cold air intake

1e

Electrical connector

2a

Bolts

2e

Insert fastener

2b

Screw

2f

Bolts

2c

Bolts

2g

Front module carrier

2d

Screw

3

Coolant lines

4

Fan unit

4

Fan unit

5

Coolant hose

6

Coolant hose

7

Coolant hose

8

Grid

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

 Warning

Risk of injury. Moving parts can pinch, crush or, in extreme cases even sever extremities.

No parts of the body or limbs should be within the operating area of mechanical components when moving components.

AS00.00-Z-0009-01A

 Danger

Risk of explosion caused by escaping hydrogen or overheating of the fuel tanks when working on the hydrogen system. Risk of frostbite to body parts caused by escaping gas and by touching component parts carrying gas when emptying fuel tanks. Risk of asphyxiation caused by inhalation of air diluted by hydrogen. Risk of burn injuries by coming into contact with an invisible pale blue hydrogen flame.

AS00.00-Z-0030-01B

Topical note

Notes on fuel cell system

AH00.00-P-0022-01RFW

Topical note

Notes on fuel cell coolant

AH06.50-P-0001-01RFW

 

Remove/install

1

Ensure that the requirements for driving into the workshop are fulfilled.

Topical note

Requirements for driving into the workshop

AH00.00-P-0021-01RFW

2

Print out "Tank system event log, fuel cell form," fill it out, and attach it to the vehicle where it is clearly visible.



OF00.00-P-3000-21RFW

3

Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).

4

Remove fuel cell cover (1).

5

Remove intake air duct (1a).

6

Remove expansion rivets (1b, 1c) and remove cold air intake (1d).

 Installation: Ensure that the brackets (arrows) are positioned correctly on the front module carrier (2g).

 Clip remover

*452589016300

7

Remove screws (2a, 2b, 2c, 2d).

 M61

*BA00.10-P-1002-04A

 Bolt, strut to cross member

*BA62.30-P-1003-01H

 Bolt, lock striker to cross member/front-module carrier

*BA62.30-P-1008-01H

8

Release insert fasteners (2e) and remove.

9

Remove screws (2f).

 M61

*BA00.10-P-1002-04A

10

Remove front module carrier (2g).

11

Drain coolant from cooler until the coolant level in the cooler is below the connection for the coolant hose (5).

AR20.00-P-1142RFW

12

Release coolant lines (3) at fan unit (4).

 The coolant lines (3) are attached to the fan unit (4) with two retaining clamps.

13

Disconnect electrical connector (1e).

14

Remove coolant hoses (5, 6, 7).

AR20.20-P-7441-01RQ

15

Remove low-temperature circuit valve from fan unit (4).

AR20.00-P-1048RFW

16

Release grids (8) and remove fan unit (4) in upward direction.

17

Install in the reverse order.

 Metric screws/bolts and nuts as per MBN 10 105, 10 143

Number

Designation

8.8

10.9

BA00.10-P-1002-04A

M61

Nm

9

13

 Cross member and front reinforcement

Number

Designation

Model 253

BA62.30-P-1003-01H

Bolt, strut to cross member

M8

Nm

20

 Cross member and front reinforcement

Number

Designation

Model 253

BA62.30-P-1008-01H

Bolt, lock striker to cross member/front-module carrier

Nm

10