A. M-Injection Pump With Pneumatic Governor
Adjustment of Idle Speed and Idle Speed AdjusterA. Engine 615,616 M-injection pump with pneumatic governor
Standard version up to 1975
National version (USA) 1976
Test and adjusting data
Idle Speed 700-800/min
Special Tools:
Conventional Tool:
Note: Do not adjust idle speed when engine is too hot, e.g. immediately following a fast ride or after measuring output on output dynamometer
Adjustment
1 Switch off air conditioner or automatic climate control. Move selector lever in position "P".
2 Connect revolution counter. Use adaptor when connecting mechanical revolution counter.
3 Run engine to 75-85 °C oil temperature.
4 Check regulating linkage for easy operation and wear.
5 Turn idle speed adjuster completely to the right.
6 Check distance between adjusting ring and guide lever and adjust, if required. Nominal dimension approx. 0.1 mm.
7 Disconnect connecting rod (3). Check throttle valve and check valve flap for easy operation.
8 Check idle speed and adjust to specified speed by means of idle speed adjusting screw (4), if required. If the idle speed cannot be adjusted, check vacuum line, sealing rings for tickler shaft, governor housing, governor diaphragm for leaks. Checking Pneumatic Governor of Injection Pump For Leaks
9 Attach connecting rod (3) free of tension. Adjust regulating linkage, if required.
10 Set selector lever to driving position (automatic transmission), engage air conditioner, turn power steering to full lock, engine should run smoothly. Readjust speed, if required.
11 Set idle speed adjuster by turning knob counter-clockwise, approx. 1/2 turn idle travel should be available until idle speed increases. Adjust idle travel with adjusting screw (arrow) if required.