In the course of time, erosion occurs at the points creating a pit and build-up (material transfer). This does not normally affect operation. If the points are badly eroded, new ones must be installed.
Possible defects in the system can be determined by checking the points visually.
|1 - Pit and build-up with clean contact surfaces||Normal erosion|
|2 - Gray contact surfaces||Breaker point gap too small and pressure too low|
|3 - Breaker points blue||Ignition coil or condenser defective|
|4 - Burnt contact surfaces||Dirty (grease)|
The breaker points should not come into contact with grease or oil (on the feeler gauge for example), otherwise premature wear will result.
Take fan off carefully! Do not apply load of more than 500 grams (18 ounces) to motor shaft! See Chapter 1.6.
From August 1st, 1969 (Chassis # 410 2000 001) combustion air blower motors from Bosch and AEG are installed. The complete motors can be interchanged. Repairs and adjustments on the AEG motors should be carried out in principle as for Bosch motors, the only difference being the removal and installation of the fuel pump breaker contacts. Contrary to the Bosch motor on which the complete contact breaker plate is replaced, the contacts are replaced individually on the AEG motor.
Contact for fuel pump
Contact for ignition