Auxiliary Water Pump: Service and Repair

WM 827219 Removing and installing circulating pump for auxiliary heater

Tools





Technical values






Preliminary work

Remove left front wheel. -> 440519 Removing and installing wheel - section on "removing" Removal and Replacement

Remove front left wheel housing liner. -> 505619 Removing and installing front wheel housing liner - section on "removing" Service and Repair

Removing circulating pump for auxiliary heater





Installation position of circulating pump for auxiliary heater

Information

Before disconnecting the water lines, it is essential to observe the safety instructions in -> 1001AW The most important working regulations and warning information 1001AW the Most Important Working Regulations and Warning Notes - Group 19 - Cooling.

1. Drain coolant. -> 193817 Draining and filling in coolant (includes bleeding)
2. Clamp the two upper hoses -b- using a hose clamp 3094 -d-.





Disconnecting upper and lower hoses

3. Clamp the two lower hoses -c- using a hose clamp 3094 -d-.
4. Disconnect circulating pump plug connection.
4.1. Open the line bracket -arrow A- and remove line -arrow B-.
4.2. Remove plug connection on holder -arrow C-.
4.3. Release plug connection -arrow D- and disconnect it -arrows E-.





Disconnecting plug connection for circulating pump

5. Unscrew fastening nut -1- and remove water tube from threaded bolt -arrow-.





Loosening water tube

6. Remove circulating pump for auxiliary heater.
6.1. Loosen spring band clamps using assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 ( -arrows A- ) and slide them down off the connections -arrows B-.
6.2. Pull water hoses off the circulating pump -arrows C-.
6.3. Unscrew fastening screw -1- and open clamp -2- ( -arrow D- ).
6.4. Remove circulating pump for auxiliary heater -3- ( -arrow E- ).





Removing circulating pump for auxiliary heater

Installing circulating pump for auxiliary heater

1. Install circulating pump for auxiliary heater.
1.1. Place circulating pump for auxiliary heater -3- in installation position -arrow A-.
1.2. Close clamp -2- ( -arrow B- ) and screw down using the fastening screw -1-.

Information

- Before connecting the water hoses, apply suitable rubber lubricant to the flanges.

1.3. Slide water hoses onto the circulating pump -arrows C-.
1.4. Slide spring band clamps onto the connections using the assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 ( -arrows D- ) and align with the markings.
1.5. Slacken spring band clamps -arrows E- and secure the hoses.





Installing circulating pump for auxiliary heater

2. Connect the water tube to the threaded bolt -arrow- and secure with the fastening nut -1-. => Tightening torque: 6 Nm (4.5 ftlb.)





Securing water tube

3. Connect plug connection for circulating pump.
3.1. Push the plug connection -arrow A- together until it engages securely.
3.2. Push plug connection onto holder -arrow B-.
3.3. Insert line into the line bracket -arrow C- and close line bracket -arrow D-.





Connecting plug connection for circulating pump

4. Unscrew the hose clamp 3094 and remove it.

Subsequent work

1. Fill in coolant and bleed cooling system. -> 193817 Draining and filling coolant (includes bleeding)
2. Install front left wheel housing liner. -> 505619 Removing and installing front wheel housing liner - section on "installing" Service and Repair
3. Installing front left wheel. -> 440519 Removing and installing wheel - section on "installing" Removal and Replacement