19, Cooling

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Fig 1: Coolant Pump Components Location With Torque Specification

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Coolant pump

1	Coolant pump
2	Seal; fitted in pump
3	Screw, M6 x 25 => For details of tightening sequence, see below > Tightening torque 12 Nm (9 ftlb.)
A	Direction of travel

Fig 2: Coolant Pump Screws Tightening Sequence

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Tightening sequence for coolant pump

Fig 3: Coolant Guide Components Location With Torque Specification

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Coolant guide

1	Coolant pipe for heater
2	Screw, M6 > Tightening torque 12 Nm (9 ftlb.)
3	Sealing ring
4	Screw plug M16 x 1.5 > Tightening torque 30 Nm (22 ftlb.)
5	Screw, M6 > Tightening torque 12 Nm (9 ftlb.)
6	Coolant guide tube (collection pipe)
7	Metal seal
8	Stoppers

Fig 4: Thermostat Housing And Coolant Regulator Components Location With Torque Specification

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Thermostat housing and coolant regulator

1	Thermostat housing
2	Screw, M6 x 25 > Tightening torque 12 Nm (9 ftlb.)
3	Screw, M6 x 25; screwed to fuel high-pressure distributor pipe => see relevant service information
4	Seal for thermostat housing; replace
5	Thermostat insert; including electric heating element

Fig 5: Thermostat Housing Screws Tightening Sequence

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Tightening sequence for thermostat housing

Fig 6: Coolant Return On Turbo Engine Components Location With Torque Specification

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Coolant return on turbo engine

1	Connection piece on generator
2	Screw for connection piece > Tightening torque 10 Nm (7.5 ftlb.)
3	Screw, M6 x 20 > Tightening torque 10 Nm (7.5 ftlb.)
4	Coolant return line
5	Coolant return hose assembly
6	Holder
7	Screw, M6 Aluminium screw; always use new aluminium screws > Initial tightening 4 Nm (3 ftlb.) and > Final tightening 90°
8	Clip

Fig 7: Coolant Return On Naturally Aspirated Engine Components Location With Torque Specification

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Coolant return on naturally aspirated engine

1	Connection piece on generator
2	Screw for connection piece > Tightening torque 10 Nm (7.5 ftlb.)
3	Screw, M6 x 20 > Tightening torque 10 Nm (7.5 ftlb.)
4	Coolant return line
5	Coolant return hose assembly
6	Holder
7	Screw, M6 Aluminium screw ; always use new aluminium screws > Initial tightening 4 Nm (3 ftlb.) and > Final tightening 90°
8	Clip

Fig 8: Coolant Supply On Turbo Engine Components Location With Torque Specification

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Coolant supply on turbo engine

1	Screw, M6; coolant line to collection pipe > Tightening torque 10 Nm (7.5 ftlb.)
2	Coolant pipe
3	Screw for connection piece > Tightening torque 10 Nm (7.5 ftlb.)
4	Connection piece on generator
5	Coolant supply hose for oil/coolant heat exchanger
6	Coolant supply hose to generator

Fig 9: Coolant Supply On Naturally Aspirated Engine Components Location With Torque Specification

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Coolant supply on naturally aspirated engine

1	Screw, M6; coolant line to collection pipe > Tightening torque 10 Nm (7.5 ftlb.)
2	Coolant pipe
3	Screw for connection piece > Tightening torque 10 Nm (7.5 ftlb.)
4	Connection piece on generator
5	Coolant supply hose for oil/coolant heat exchanger
6	Coolant supply hose to generator

Fig 10: Ventilation Components Location With Torque Specification

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Ventilation

1	Vent line
2	Screw, M6 x 16 > Tightening torque 10 Nm (7.5 ftlb.)

Fig 11: Temperature Sensor Components Location With Torque Specification

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Temperature sensor

1	Temperature sensor in engine compartment
2	Grommet
3	Temperature sensor > Tightening torque 30 Nm (22 ftlb.)

Location	Description	Type	Basic value	Tolerance
Screw securing water tube to cylinder head	M6 screw	Tightening torque	10 Nm (7.5 ftlb.)

Location	Description	Type	Basic value	Tolerance
Coolant reservoir	Screw/Item 3	Tightening torque	9 Nm (6.5 ftlb.)

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Component overview of coolant reservoir

Fastening screw securing electric fan for engine to radiator frame

Tightening torque

10 Nm (7.5 ftlb.)