B. MW and M/RSF-Injection Pump With Mechanical Governor
Adjustment of Idle Speed and Idle Speed AdjusterB. Engine 615, 616, 617 MW and M/RSF-injection pump with mechanical governor
Test And Adjusting Data:
Conventional Tool:
Note: Do not adjust engine when it 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 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 (1), 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 re quired and set idle speed to specified speed by means of idle speed adjusting screw (4).
Use box wrench to avoid damage to adjusting screw (4).
9 Attach connecting rod free of tension. Adjust regulating linkage, if required.
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, if required.
11 Accelerate with accelerator pedal, while simultaneously turning idle speed adjuster counterclockwise. Speed should now amount to 1000-1100/min. Adjust with adjusting screw (arrow in fig. item 12), if required.
Run engine for some time at this speed. If 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. 1/2 turn idle travel should be available until idle speed increases. Set idle speed by means of adjusting screw (arrow), if required.