NOTE: Use of a diesel (magnetic) tachometer is required. A conventional tachometer as used on gasoline engines will not work. When connecting the diesel tachometer, follow the manufacturer's instructions carefully.
- Make certain that the lights and all electrical accessories are turned off.
- Set the parking brake and place the shift selector in Neutral.
- Connect the tachometer.
- Run the engine until the coolant warms to normal operating temperature.
- Once the engine is completely warmed up, run the engine at 2000–3000 rpm for at least 5 seconds.
- Allow the engine to run at idle for 2 minutes.
- Read the idle speed on the tachometer. If the idle is not within specifications, adjust the idle speed screw. Loosen the locknut, then turn the adjusting screw with a small screwdriver.
NOTE: Do not disturb other screws or linkages.
- When the proper idle speed is achieved, hold the screw in position and tighten the locknut.
- Stop the engine and remove the tachometer.
| Fig. 1:
When adjusting the idle speed on carbureted engines adjust only SAS–1 screw
|
| Fig. 2:
Do not touch the SAS–2 screw
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| Fig. 3:
Diesel engine idle speed adjustment
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