Thermostat: Service and Repair

Removing and Installing Coolant Regulator




Tools


Removal Of The Coolant Regulator




Removal overview





1. Drain coolant
1. Open lid on the expansion tank. Undo the drain plug on the two necks for coolant and collect the coolant. After draining the coolant, fit new sealing rings on the drain plug -arrow-.
Tightening torque: 10 to 15 Nm (7.5 to 11 ft. lbs.)





2. Remove closure cap
- Remove the closure cap -arrow- on the cylinder head over the oil extraction pump of the cylinder bank 1 to 3. To do this, remove the three hexagon-head bolts and remove the closure cap.





3. Remove coolant hose
- Unclip the coolant hose on the housing of the coolant regulator with a screwdriver and pull the coolant hose up and off.





4. Remove coolant regulator housing
1. Undo the three fastening screws -arrow- of the coolant regulator housing.
2. Remove the coolant regulator housing.

Note: Do not use the seal again.





5. Remove coolant regulator
1. Remove coolant regulator with assembly aid 9627.
2. Insert assembly aid between the sheetmetal edges as shown. Push the assembly aid against the spring force until the retaining bracket is released.
3. Turn coolant regulator by approximately 90° and take coolant regulator out of the housing.


Installation Of The Coolant Regulator




Installation overview





1. Install coolant regulator.
1. Insert coolant regulator in the housing as shown.
2. Push against the spring force using assembly aid 9627 and turn until both sheetmetal edges are touching the housing.





2. Install coolant regulator housing
1. Clean sealing surfaces.
2. Position coolant regulator housing with a new seal.
3. Tighten the three fastening screws -arrow-.
Tightening torque: 10 Nm (7.5 ft. lbs.)





3. Push on coolant hose.
1. Insert retaining clip.
2. Push the coolant hose with a new seal into the coolant regulator housing.
3. Push hose downwards until the retaining clip is heard to engage.
4. Pull the hose slightly to check for secure seating.





4. Install closure cap.
1. Reinstall the closure cap -arrow- beside the oil extraction pump on the cylinder bank 1 to 3.
2. Lightly coat the O-ring with acid-free grease.
3. Press in the closure cap -arrow- evenly by hand.
4. Ensure that the fastening holes overlap.
5. Tighten the three fastening screws.
Tightening torque: 10 Nm (7.5 ft. lbs.)





5. Bleed coolant circuit
Bleed the coolant circuit carefully. To do this, lift the bow on the closure cap.