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OM 617 – Adjustment of idle speed and idle speed adjuster

A. Engine 61 5, 616 M-injection pump with pneumatic governor

National version @1976

Identification: Information plate in national language on cross member in front of radiator.
Adjust engines according to data of respective emission control information plate.
Color code: black

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 t o 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.
I f the idle speed cannot be adjusted, check vacuum line, sealing rings for tickler shaft, governor housing, governor diaphragm for leaks (07.1-125).

9. Attach connecting rod (3) free of tension. Adjust regulating linkage, i f required (30-300).
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. 112 turn idle travel should be available until idle speed increases. Adjust idle travel with adjusting screw (arrow) if required.

B. Engine 61 5, 616, 617 MW and MIRSF-injection pump with mechanical governor

Note
Do not adjust engine when i t i s 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 into 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 and check distance between adjusting ring and shaped spring or nipple and clip on shaped spring and adjust, if required. Nominal dimension = approx. 1.0 mm.

Attention!
Check whether shaped spring (arrow) has been correctly installed.

6. Check whether Bowden wire for Tempomat/cruise control rests free of tension against regulating lever (arrow). For this purpose, push shutoff lever up to stop. Adjust Bowden wire with adjusting nut ( I ), if required.
Release shutoff lever (idle speed position). In this position, Bowden wire is slack.

Engine 617 in model 115.1

Engine 616, 617 in model 123.1

7. Disconnect connecting rod (2) on guide lever (1).
8. Check idle speed, loosen counternut (3) if required and set idle speed to specified speed by means of idle speed adjusting screw (4).

Engine 6 1 7 . 9 1 0 with MW-injection pump
1. Guide lever
2. Connecting rod
3. Counternut
4. Idle speed adjusting screw

Engine 616, 6 1 7 with MW-injection pump

Use box wrench to avoid damage to adjusting screw (4).

Engine 61 5, 616, 61 7 with MIRSF-injection pump

9. Attach connecting rod free of tension. Adjust regulating linkage, if required (30-300).
10. Place selector lever into driving position (automatic transmission), switch on air conditioner, turn
power steering to full lock, engine should run smoothly. Readjust speed, i f required.
11. Accelerate with accelerator pedal, while simultaneously turning idle speed adjuster counterclock wise. Speed should now amount to 1000-1 100/min.
Adjust with adjusting screw (arrow in fig. item 12), if required.

Run engine for some time at this speed. I f speed increases automatically, slightly reduce speed at adjusting screw.
Attention!
When the speed is set higher, the idle speed control range is left. As a result, the engine speed can increase up to max speed (unloaded).

12. Adjust idle speed adjuster by turning knob counterclockwise, approx. 112 turn idle travel should
be available until idle speed increases. Set idle speed by means of adjusting screw (arrow), if required.

 

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