Thermostat: Service and Repair

WM 195819 Removing and installing coolant regulator








Preliminary work

Preliminary work

Warning
Risk of injury from hot engine and hot engine fluids.
Danger of burns, scalding, damage to skin, injury to the eyes.

- Do not carry out work on the engine while it is hot.

Warning
Coolant is hazardous to health.
Risk of skin irritation.

- Wear protective gloves and goggles.

- In the event of contact with the skin or eyes, wash immediately with plenty of water.

1. Place a clean container under the vehicle.
2. Drain coolant.
3. Remove coolant hoses to coolant pump and thermostat; to do this, first open a spring band clamp for each hose.

Removing coolant regulator

Remove coolant regulator

Warning
Coolant is hazardous to health.
Risk of skin irritation.

- Wear protective gloves and goggles.

- In the event of contact with the skin or eyes, wash immediately with plenty of water.

1. Remove two M6 fastening screws -1- for coolant line on crankcase. Unscrew three M6 screws on coolant regulator housing -arrow-.





Undoing thermostat housing

2. Push coolant line upward and unscrew the top fastening screw -arrow-.





Thermostat housing - top left screw

3. Remove housing, take out thermostat. Collect the emerging coolant.

Thermostat insert tool





Thermostat insert tool

4. Using the assembly aid P 9627, push the springs down and twist the sheet metal tabs out of the holding slots, remove insert.





Removing/fitting thermostat insert

Installing coolant regulator

Installing coolant regulator

1. Clean the sealing faces of the housing and crankcase.
2. Insert thermostat insert into guide using the assembly aid P 9627.





Removing/fitting thermostat insert

3. Position housing cover with new seal and thermostat on crankcase and position with four M6 fastening screws.
4. Tighten the screws. - Tightening torque: 10 Nm (7.5 ftlb.)

Information
To facilitate assembly of coolant pipes and hoses, smear with Kluber Syntheso Glep or alternatively Kluberplus S06-100 assembly gel.

5. Fit coolant hoses.
6. Secure coolant line on crankcase. Tighten two M6 screws. - Tightening torque: 10 Nm (7.5 ftlb.)

Subsequent work

Subsequent work

Warning
Coolant is hazardous to health.
Risk of skin irritation.

- Wear protective gloves and goggles.

- In the event of contact with the skin or eyes, wash immediately with plenty of water.

1. Fill coolant and bleed system.
2. Perform a test drive, adjusting the coolant level in the container if necessary (note minimum/maximum marking).