Heater Control Valve: Service and Repair
WM 827419 Removing and installing directional-control valve
Tools
Technical values
Preliminary work
1. Remove complete heater. => 822019 Removing and installing complete heater - section on "Removing"
2. Remove intake muffler with intake manifold. => 822119 Removing and installing intake muffler - section on "Removing"
Removing directional-control valve
Installation position of directional-control valve
1. Release connector -arrow A- and pull it off the directional-control valve -arrow B-.
Releasing connector and pulling it off directional-control valve
2. Unscrew fastening screw -2- and remove water tube holder -1-.
Removing water tube holder
3. Drill out blind rivet -1- at the water tube.
Drilling out blind rivet at water tube
4. Remove water tube holder.
4.1. Screw off both fastening nuts -1-.
4.2. Unscrew fastening screw -2-.
4.3. Remove water tube holder -3- ( -arrow- ).
Removing water tube holder
5. Loosen water tube at the heater.
5.1. Undo spring band clamp using assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 ( -arrows A- ) and push down off the adapter -arrow B-.
5.2. Pull water tube down off heater -arrow C- and remove it.
Loosening water tube at heater
6. Unscrew fastening screws -1- on the heater.
Unscrewing fastening screws on heater
7. Loosen water tube on directional-control valve at the top.
7.1. Undo spring band clamp using assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 ( -arrows A- ) and push down off the connection -arrow B-.
7.2. Pull water tube off the directional-control valve -arrow C- and swivel it downwards.
Loosening water tube on directional-control valve at the top
8. Remove directional-control valve holder.
8.1. Unscrew both fastening screws -1- on the directional-control valve -2-.
8.2. Screw off both fastening nuts -3- on the directional-control valve holder -4-.
8.3. Remove directional-control valve holder -4- ( -arrow- ).
Removing directional-control valve holder
9. Remove directional-control valve.
9.1. Undo spring band clamps using assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 ( -arrows A- ) and push down off the connections -arrows B-.
9.2. Pull directional-control valve out of the moulded hoses -arrow C- and remove it.
Removing directional-control valve
Installing directional-control valve
1. Install directional-control valve.
Information
- Before connecting the water hoses, apply suitable rubber lubricant to the flanges.
1.1. Push directional-control valve into the moulded hoses -arrow A-.
1.2. Slide spring band clamps onto the connections using the assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 ( -arrows B- ) and align with the markings.
1.3. Slacken spring band clamps -arrows C- and secure the hoses.
Installing directional-control valve
2. Install directional-control valve holder.
2.1. Insert directional-control valve holder -4- ( -arrow- ).
2.2. Secure directional-control valve holder -4- using the two fastening nuts -3-. => Tightening torque: 6 Nm (4.5 ftlb.)
2.3. Screw down directional-control valve -2- using the two fastening screws -1-. => Tightening torque: 3.5 Nm (2.5 ftlb.)
Installing directional-control valve holder
3. Secure water tube on the directional-control valve at the top.
Information
- Before connecting the water hoses, apply suitable rubber lubricant to the flanges.
3.1. Swivel water tube upwards and slide it onto the directional-control valve -arrow A-.
3.2. Slide spring band clamp onto the connection using the assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 ( -arrow B- ) and align with the markings.
3.3. Slacken spring band clamp -arrows C- and secure the hoses.
Securing water tube on directional-control valve at the top
4. Position heater on holder and secure with the fastening screws -1-. => Tightening torque: 8 Nm (6 ftlb.)
Tightening fastening screws on heater
5. Secure water tube at the heater.
Information
- Before connecting the water hoses, apply suitable rubber lubricant to the flanges.
5.1. Place water tube in installation position and slide it onto the heater -arrow A-.
5.2. Slide spring band clamp onto the connection using the assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 ( -arrow B- ) and align with the markings.
5.3. Slacken spring band clamp -arrows C- and secure the hose.
Securing water tube at heater
Information
Make sure the water tube holder is installed at the correct position.
The exhaust pipe runs behind the water tube holder.
6. Install water tube holder.
6.1. Position water tube holder -3- ( -arrow- ).
6.2. Tighten fastening screw -2-. => Tightening torque: 4.5 Nm (3.5 ftlb.)
6.3. Tighten fastening nuts -1-. => Tightening torque: 6 Nm (4.5 ftlb.)
Installing water tube holder
7. Position water tube on holder and secure with a blind rivet -1- (4.8 x 10).
Positioning water tube on holder and securing with a blind rivet
8. Push water tube holder -1- onto the two water tubes and screw down using the fastening screw -2-. => Tightening torque: 3 Nm (2 ftlb.)
Installing water tube holder
9. Plug connector onto the directional-control valve -arrow- until the connector engages securely.
Plugging connector onto directional-control valve
Subsequent work
1. Install intake muffler with intake manifold. => 822119 Removing and installing intake muffler - section on "Installing"
2. Install complete heater. => 822019 Removing and installing complete heater - section on "Installing"