Remove/install coolant pump pump unit

AR20.10-P-1400OLI

Remove/install coolant pump pump unit

05.09.2019

Engine

654 in model 205, 253

1

Pump unit for coolant pump

2

Catalytic converter

4

Bracket

5

Retaining pin

6

Electrical wiring harness

7

Vacuum line

8

Bolts

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

 

Remove/install

1

Drain off coolant.

Engine 654 in model 253

AR20.00-P-1142OLG

Engine 654 in model 205

AR20.00-P-1142OLI

2

Remove poly-V-belt.

AR13.22-P-1202OLI

3.1

Remove catalytic converter (2) and place to one side with connected lines.

Engine 654 in model 205.### 1# , 253.### 1#

AR49.20-P-0100OLI

3.2

Remove exhaust gas aftertreatment unit and place to one side with connected lines.

Engine 654 in model 205.### 2# , 253.### 2#

AR49.20-P-1500OLI

4

Remove exhaust gas recirculation cooler bypass switchover valve (Y85)and place to one side with lines attached.

Engine 654 in model 205
Engine 654 in model 253
except code 460 (Canada version)
except code 494 (US version)

AR14.20-P-7667OLI

5

Remove bracket (4).

 Bolt, bracket for catalytic converter to crankcase

*BA49.10-P-1007-02H

6

Remove retaining pin (5).

 Ball stud for engine cover to crankcase/oil filter housing

*BA01.10-P-1002-01D

7

Remove electrical wiring harness (6) from the pump unit for the coolant pump (1) and from crankcase.

 M61

*BA00.10-P-1002-04A

 Mounting wedge

*110589035900

8

Remove screws (8).

 Screw, bearing housing/belt pulley to water pump

*BA20.10-P-1003-01BA

9

Remove vacuum line (7) from pump unit for coolant pump (1).

10

Remove pump unit for coolant pump (1) and catch escaping coolant with a suitable container.

 Installation: Replace seal.

11

Clean sealing surfaces with a lint-free rag.

12

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

 Engine cover

Number

Designation

Engine 654

BA01.10-P-1002-01D

Ball stud for engine cover to crankcase/oil filter housing

Nm

4

 Coolant pump, coolant thermostat

Number

Designation

Engine 654

BA20.10-P-1003-01BA

Screw, bearing housing/belt pulley to water pump

Nm

8

 Exhaust system

Number

Designation

Model 205 with engine 654

Model 253 with engine 654

BA49.10-P-1007-02H

Bolt, bracket for catalytic converter to crankcase

Nm

20

20