7.4. A control system of temperature of the soaked-up air
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Implementation of the diagnostic procedures described below will require the manual vacuum pump with the vacuum gage. |
System of supply of hot air
Principle of action
Efficiency of combustion of air-fuel mix will be defined by constancy of temperature of the air which is soaked up in the carburetor via the air cleaner, regardless of temperature in a motive compartment. For performance of the given condition the air path between assemblies of a pyleotdelitel and the air cleaner switched on the control unit by temperature of the soaked-up air.
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At the cold engine and when temperature of the soaked-up air is lower some set a bimetallic spring closes the thermostatic valve in the air cleaner (see an illustration below - models of 4.2 l). At the same time depression of the inlet pipeline moves on the vacuum motor which closes the air admission gate. At the closed gate hot air comes to the air cleaner through a separate entrance which opens now on a flexible metal tube. Heating of air is carried out in the heater located on a final collector (on an accompanying illustration components of a control system of temperature of the soaked-up air of models of 4.2 l are shown). |
In process of increase of temperature in the air cleaner the bimetallic spring of the thermostatic valve gradually opens access of atmospheric air due to decrease in depth of the depression given on the vacuum motor. The sprung gate of supply of hot air is at the same time closed.
Functioning check
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- Remove an air inlet sleeve from assembly of the air cleaner.
- Make sure that at the idle engine the inlet gate holds position of access of cold air. Manually move the gate, checking freedom of its movement.
- At single turns of the cold engine the gate has to be closed, providing access of hot air. Disconnect a vacuum hose of the vacuum motor, - the gate has to open quickly, providing access of cold air. Stop up a vacuum hose with a finger and make sure that depression reaches the vacuum motor.
- Serviceability of functioning of the thermostatic valve can be checked by its artificial cooling with compressed air and artificial heating with the hair dryer for hair.
- Operability of the vacuum motor is checked by connection to it the manual vacuum pump with the vacuum gage. The inlet gate has to begin to open with a depth of depression of 72 mm of mercury. on models of 4.2 l and 50 ± 15 mm of mercury. on models of 3.0 l. Full opening of the gate has to happen at depression of 146 mm of mercury. on models of 4.2 l and 100 ± 25 mm of mercury. on models of 3.0 l. In case of need make replacement of the motor.
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Stabilizer (valve compensator) of turns of the heated-up engine
The valve represents the thermosensitive valve providing supply of additional air in the inlet pipeline of the hot engine (see accompanying illustrations - engines of 4.2 l and engines of 3.0 l). At the same time there is a mix impoverishment that increases stability of turns of idling and reduces issue in the atmosphere of hydrocarbonic connections.
Functioning check - models of 4.2 l
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- Remove assembly of the air cleaner.
- At a surrounding temperature near itself below 60 °C the compensator has to be closed.
- By means of the hair dryer for hair heat the compensator block to temperature of 74 °C and blow in the union. Air has to pass freely through the valve, otherwise replace the compensator.
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Functioning check - models of 3.0 l
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- Remove assembly of the air cleaner.
- At a surrounding temperature near itself below 60 °C the compensator has to be completely closed.
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- By means of the hair dryer for hair heat the compensator block to temperature of 75 °C, - the valve of the compensator has to open completely, otherwise replace the block.
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System of preliminary heating of air-fuel mix - model of 3.0 l
Principle of action
The system consists of the relay and the assembly of a heating element located between the basis of the carburetor and the inlet pipeline.
At start of the engine the heater is powered, providing heating of the air-fuel mix passing through it. At the same time intensity of dispersion of fuel increases and emission of monoxide of carbon (SO) decreases.
Functioning check
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- At the cold engine include ignition (a key in position of ON).
- Put a palm on the case of throttles of the carburetor and make sure of temperature increase.
- If within several minutes of heating does not occur, check presence of tension of the battery on the electric socket of the heater.
- If tension is present, and there is no heating, replace a heating element.
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- If there is no tension, check serviceability of the relay (see an accompanying illustration) and a condition of an electrical wiring of the heater.
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- Upon completion of check switch off ignition.
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