Six-cylinder engine
The automatic intake air preheater is located on the inlet side of the air filter housing. He is faced with the task of maintaining a favorable temperature of the air sucked in by the engine.
The reason for this is that in cold weather the air/fuel mixture is more saturated if the intake air is preheated. The same amount of warm air occupies a larger volume than cold air. Since the engine can only take in a certain amount of air, when the preheating is on, slightly less air enters - the mixture becomes richer, fuel consumption increases. For trouble-free operation of the engine, this is only necessary at low temperatures.
Functioning
The intake air pre-heating damper is controlled by a thermostat, which fully opens the warm air supply at -20°C. As the temperature rises, the damper slowly closes until it closes completely at +5°C.
Violations at work
If the pre-heating of the air does not function satisfactorily, this can lead to operational problems.
During the cold season:
- Erratic idling after starting a cold engine during the warm-up phase.
- Poor shifting, engine prone to stalling.
During the warm season:
- Reduced power, maximum speed not reached.
- Increased fuel consumption.
Checking air preheating
Six-cylinder engine
1. Remove the filter insert.
2. Look into the hose nozzle, if necessary, take a flashlight.
3. Depending on the ambient temperature, the air damper should close the cold or warm air supply.
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