Remove/install coolant feed tube to exhaust gas recirculation cooler

AR20.20-G-7452H

Remove/install coolant feed tube to exhaust gas recirculation cooler

08.08.2018

Engine

471.9, 473.9 in model 800.310/320

Modification notes

31.08.2017

Document revised completely.

1

Exhaust gas recirculation cooler

6

Screw

11

Connection piece

2

Coolant feed pipe

7

Screw

B621

Exhaust gas recirculation (AGR) differential pressure sensor

3

Bracket

8

Electrical line

A

Old as-built configuration

4

Connection piece

9

Oil/coolant module

5

Exhaust gas recirculation line

10

Bracket

2

Coolant feed pipe

9

Oil/coolant module

11

Connection piece

12

Coolant connection

B

New as-built configuration

 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

 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

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-N-5000-01H

 

Remove/install

1

Switch off ignition

2

Drain off coolant

AR20.00-G-1142H

3

Expose electrical line (8) and disconnect electrical connection on EGR (AGR) differential pressure sensor (B621)

4

Remove bracket (3) at exhaust gas recirculation cooler (1)

 Bolt, coolant line bracket to exhaust gas recirculation cooler

*BA14.20-N-1019-01I

5

Remove bolts (6)

 Screw/bolt, exhaust gas recirculation line to cylinder head bracket

*BA14.20-N-1014-01I

6

Loosen screw/bolt (7)

 Screw/bolt, exhaust gas recirculation line to cylinder head bracket

*BA14.20-N-1014-01I

7

Push away exhaust gas recirculation line (5) from bracket (10)


Do not damage hose pieces at EGR line (5).
Damaged component parts must otherwise be replaced.

8

Remove coolant connection (12) at oil/coolant module (9)

Only in new as-built configuration (B).

 Installation: Replace seal on coolant connection (12).

 Coolant fitting on oil/coolant module

*BA20.00-N-1008-02D

9.1

Pull coolant feed pipe (2) out of exhaust gas recirculation cooler (1) and oil/coolant module (9) and remove

In case of old as-built configuration (A)

 Installation: Replace connection pieces (4, 11).

9.2

Remove coolant feed pipe (2) from exhaust gas recirculation cooler (1) and together with coolant connection (12)

In case of new as-built configuration (B)

 Installation: Replace connection piece (4).

10

Clean sealing surfaces

11

Install in the reverse order

12

Start engine and perform an engine test run

 Allow engine to run at a higher rotational speed.

13

Switch off engine and check area of coolant feed pipe (2) for leaks

 Visual inspection.

 Exhaust gas recirculation

Number

Designation

Engine 471.9

Engine 473.9

BA14.20-N-1014-01I

Screw/bolt, exhaust gas recirculation line to cylinder head bracket

M8

Nm

30

30

M10

Nm

60

60

 Exhaust gas recirculation

Number

Designation

Engine 471.9

Engine 473.9

BA14.20-N-1019-01I

Bolt, coolant line bracket to exhaust gas recirculation cooler

Nm

30

30

 Engine cooling, general

Number

Designation

Engine 471.9

Engine 473.9

BA20.00-N-1008-02D

Coolant fitting on oil/coolant module

Nm

50

50