Remove/install coolant pump

AR20.10-G-1271N

Remove/install coolant pump

07.06.2018

Engine

470.9, 471.9 in model 800.110/112

Modification notes

23.04.2018

Work procedure completely revised

Shown on engine 471.9

1

Belt pulley

2

Electrical connection (only for a regulated coolant pump (4))

3

Electrical connection (only for a regulated coolant pump (4))

4

Coolant pump

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

 Warning

Risk of injury caused by pinching or crushing when working on springs or spring bodies that are under tension

Use only approved tensioning devices; additionally screen off hazardous area if necessary. Check special tools for damage and proper operation (visual inspection). Wear protective gloves.

AS00.00-Z-0001-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-N-5000-01H

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW



Remove

1

Drain off coolant.

AR20.00-G-1142N

2

Release poly-V-belts of rear belt drive and basic belt drive and remove poly-V-belt of basic belt drive from belt pulley (1) of coolant pump (4).

AR13.22-G-3902-05N

3

Remove belt pulley (1) of coolant pump (4).

4

Disconnect electrical connection (2, 3).

Only for regulated coolant pump (4).

5

Remove coolant pump (4) and remove seal.



Install

6

Clean sealing surfaces.

7

Install coolant pump (4) with new seal.

 Bolt, coolant pump to oil/coolant module

*BA20.10-N-1001-01V

8

Connect electrical connectors (2, 3).

Only for regulated coolant pump (4).

9

Install belt pulley (1) with new screws at coolant pump (4).

 Bolt, belt pulley to uncontrolled coolant pump

*BA20.10-N-1003-01V

 Bolt, belt pulley to controlled coolant pump

*BA20.10-N-1004-01V

10

Check condition of poly-V-belt of basic belt drive and poly-V-belt of rear belt drive.



Damage profiles for a poly-V belt

AP13.22-D-1351-01A

If one of the poly-V-belts is damaged,



Replace respective poly-V-belt.

Remove/install basic belt drive poly-V belt

AR13.21-G-2000N

Remove/install fan drive poly-V belt (rear belt)

AR13.21-G-2005N

11

Place poly-V-belt of basic belt drive on belt pulley (1) of coolant pump (4) and tension poly-V-belts of rear belt drive and basic belt drive.

AR13.22-G-3902-05N

Belt drive routing diagram

AR13.20-G-1000-01N

 Observe the routing diagram.

12

Fill in coolant.

AR20.00-G-1142N



Check

13

Start engine and perform engine test run, switch off engine.

 Allow engine to run at a higher rotational speed.
See information from body manufacturer.

14

Check area of coolant pump (4) for leaks.

 Visual inspection.

 Coolant pump, coolant thermostat

Number

Designation

Engine 470.9

Engine 471.9

BA20.10-N-1001-01V

Bolt, coolant pump to oil/coolant module

Nm

30

30

 Coolant pump, coolant thermostat

Number

Designation

Engine 470.9

Engine 471.9

BA20.10-N-1003-01V

Bolt, belt pulley to uncontrolled coolant pump

Nm

25

25

 Coolant pump, coolant thermostat

Number

Designation

Engine 470.9

Engine 471.9

BA20.10-N-1004-01V

Bolt, belt pulley to controlled coolant pump

Nm

18

18