Auxiliary Cabin Heater: Service and Repair

64 12 ... - Replacing burner insert for independent heater

Warning!
Scalding hazard!
Carry out following tasks after engine and independent heater have cooled down.
Follow instructions for working on cooling system Instructions for Working on Cooling System!

Important!
The burner insert may only be replaced after the 24-month warranty period has elapsed.
The entire independent heater must be replaced during the warranty period.

Necessary preliminary tasks:
- Remove complete independent/auxiliary heater

Release screws (1) and remove bracket (2) from heater.
Tightening torque 64 12 2AZ Additional Heater with Controls.

Release hose clamp (1) on hose for circulating pump and disconnect hose.
Release hose clamp (2) on intake filter hose and disconnect hose.

Installation Note:
Check all water hoses for damage, replace if necessary.

Carefully lift cover (1) off heater.

Disconnect plug connection (1).

Release screws (1).
Tightening torque 64 12 3AZ Additional Heater with Controls.
Replace all screws.
Carefully lift out combustion air blower unit (2).

Release screws (1) and pull out burner insert (3) with grommet (2).
Replace all screws.
Tightening torque 64 12 4AZ Additional Heater with Controls.

Installation Note:
Make sure grommet (2) is in correct installation position.

Installation Note:
- Replace seals (1, 2) and clean sealing surfaces thoroughly.
- If necessary, remove soot deposits.
- To prevent the fuel pipe on the burner element being damaged, coat seal (2) with spirit when fitting housing.

After installation:
- Fill and vent cooling system and check for leaks