Auxiliary Cabin Heater Check Valve: Service and Repair

Removing And Installing Check Valve

Tools







Preliminary work
1. Remove complete heater.
2. Remove intake muffler.

Removing check valve







1. Release spring band clamps -1 and 2- using circlip pliers for spring band clamps, Cayenne hose connections NR.72-1-a--Pfeile A- and slide them off the flanges -Arrow B-.







2. Pull hose off the line -Arrow C-.
3. Pull off the check valve -b- and moulded hose from the hose -Arrow D-.
4. Release spring band clamp using circlip pliers for spring band clamps, Cayenne hose connections NR.72-1-Pfeile A- and slide it off the flange -Arrow B-.







5. Pull the check valve out of the moulded hose -Arrow C-.

Installing check valve

NOTE: Before installation, apply a suitable rubber lubricant to all hose connections.

1. Connect the check valve in the direction of flow -c- to the hose -Arrow A-.







2. Align flow direction on check valve -c- with marking on hose -d- by rotating the valve -Pfeile B-.
3. Using circlip pliers for spring band clamps, Cayenne hose connections NR.72-1 slide the spring band clamp onto the flange -Arrow C-.
4. Relieve spring band clamp -Pfeile D- and secure the hose.
5. Insert check valve into the hose -Arrow A-.







6. Push the moulded hose onto the line -Arrow B-.
7. Align check valve with the moulded hose by rotating it -Pfeile C- to the markings -d and e-.
8. Slide the spring band clamps -1 and 2- with the circlip pliers for spring band clamps, Cayenne hose connections NR.72-1-a- onto the flange -Arrow D- and align with the marking on the hose.
9. Relieve the spring band clamps -1 and 2--Pfeile E- and secure the hose.

Subsequent work
1. Install intake muffler.
2. Install complete heater.