Diesel engine 12V 4000 G73, 16V 4000 G73. Manual - part 29

7.15.2 Engine coolant – Change

Special tools, Material, Spare parts

Designation / Use

Part No.

Qty.

Engine coolant

Changing engine coolant

1.

Drain engine coolant (→ Page 118).

2.

Fill with engine coolant (→ Page 120).

7.15.3 Engine coolant – Draining

Preconditions

☑ Engine is stopped and starting disabled.

Special tools, Material, Spare parts

Designation / Use

Part No.

Qty.

Sealing rings

(→ Spare Parts Catalog)

WARNING

Coolant is hot and under pressure.

Risk of injury and scalding!

• Let the engine cool down.

• Wear protective clothing, gloves, and goggles / safety mask.

Preparatory steps

1.

Provide an appropriate container to drain the coolant into.

2.

Switch off preheating unit (if fitted).

Draining engine coolant

1.

Turn breather valve of filler neck on coolant

expansion tank counterclockwise to first

stop and allow pressure to escape.

2.

Continue to turn breather valve counter‐

clockwise and remove.

3.

Draw off precipitated corrosion inhibitor oil

from the expansion tank through filler neck.

4.

Open drain valves and drain plugs and

drain coolant at the following points:

• Preheating unit (if fitted)

• Thermostat housing (arrow)

• Twin elbow (arrow)

• Elbow of engine coolant pump

• Crankcase, left and right side.

TIM-ID: 0000014577 - 001

5.

Drain pint on driving end, left and right side.

Final steps

1.

Close all drain valves and install drain plugs with new sealing rings.

2.

Set breather valve onto filler neck and close it.

7.15.4 Engine coolant – Filling

Preconditions

☑ Engine is stopped and starting disabled.
☑ MTU Fluids and Lubricants Specifications (A001061/..) are available.

Special tools, Material, Spare parts

Designation / Use

Part No.

Qty.

Coolant

WARNING

Coolant is hot and under pressure.

Risk of injury and scalding!

• Let the engine cool down.

• Wear protective clothing, gloves, and goggles / safety mask.

CAUTION

Cold coolant in hot engine can cause thermal stress.

Formation of cracks in components!

• Fill / top up coolant only into cold engine.

Preparatory steps

1.

Turn breather valve of coolant expansion

tank counterclockwise until the first stop

and allow pressure to escape.

2.

Continue to turn breather valve counter‐

clockwise and remove.

TIM-ID: 0000014555 - 003