Here is the step-by-step guide on how to clean EGR valve for Scania Truck 7 litre engine.
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Procedures:
1.Remove the EGR valve from the engine.
2.Check the part of the pipe that connects to the EGR valve. Clean the sealing surface if necessary.
3.Fit the EGR valve in a vice.
Cleaning and inspection for reusing the EGR valve
1.Remove the gaskets and clean the sealing surfaces to the connecting pipe.
2.Mark the position of the EGR valve electric motor (1) in order to be able to refit the electric motor in the same way.
Then remove the electric motor with shim (2).
3.Remove the split collets, valve spring collar and valve spring by doing the following:
Press down the valve spring collar (2) by hand or using a socket. The split collets should then (1) release from the valve stem (4).
Tap carefully with a hammer if the split collets do not come loose.
Once the split collets have released: remove the split collets (1), valve spring collar (2) and valve spring (3).
4.Dry cleaning:
Wet cleaning:
A clean EGR valve gives a metallic sound when it closes. If any deposits remain that keep the valve open, the valve closes with a duller sound.
5.Reset the EGR valve:
Standard finishing operations
1.Check the harness-to-harness connector (1) to the EGR valve electric motor. There must not be any rust or wear.
2.Fit the harness-to-harness connector to the EGR valve, connect the battery and switch on 15 voltage without starting the engine.
It is normal for soot and condensate to run out of the overflow opening (2).
3.Connect the diagnostic tool and check whether fault code 1896 remains. If fault code 1896 remains, the EGR valve must be renewed.
4.Fit the EGR valve on the engine.
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