REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mercedes-Benz E-Class W123 (from 1976 to 1985, the year of issue)

general info. full specifications. diagnostics. hints. tips. tricks

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Mercedes-Benz
	W123
		Introduction
		Gasoline engines
			Design and specifications
			Engine adjustment
			Ignition system
			Power system
			The fuel injection system K-Jetronic
			The fuel injection system L-Jetronic
				Checking injectors
				Adjusting the engine idling
				Check valve further fuel supply
				Check thermo
				Check thermoelectric switch
				Check thermal time relay
				Possible malfunctions of the system L-Jetronic, their causes and remedies
			Works by car
			Work on the engine M 102
			Work on the engine M 110 and M 123
		Coupling
		Manual transmission
		Automatic Transmission
		Driveline and rear axle
		The front suspension
		Rear suspension
		A steering
		Brakes
		Electrical
		Body and Equipment

Check valve further fuel supply

PERFORMANCE ORDER

The valve should be fully open when the coolant temperature is 20 ?� C and shut down when its increase to 70 ?� C.
To check the valve on the engine is cold, remove the valve box and Blow into it: the air must pass. If not, then the valve is defective.
To check the valve on the hot engine start the engine and let it run at idle press a hose between the valve and manifold. The engine speed should not be at the same time change. Changing engine speed indicates seizing control of the plunger and the need for valve replacement.
To replace the valve drain the coolant, disconnect the coolant hoses and remove the valve.
When installing a new valve, replace the gasket.

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Check thermo