Replace low-pressure gas filter · ap4720b4781df · Mercedes-Benz WIS

AP47.20-B-4781DF

Replace low-pressure gas filter

09.04.2018

Engine	926.988 in model 382.180/181
Engine	926.996 in model 382.189
	with code MH1 (DIESEL-GASEOUS FUEL ENGINE OM926LA)

1	Low-pressure filter
2	High-pressure hose
3	Gas piping
4	Bolts
5	Drain

B47.00-0026-01

 	Remove/install
 Danger	Risk of explosion due to escaping combustible gas or overheating of gas cylinders.Risk of injury caused by burns to skin and eyes. Risk of frostbite to body parts caused by escaping gas and by touching components near the valves when emptying gas cylinders. Risk of poisoning or suffocation caused by inhaling gas.	Remove any sources of ignition. Protective clothing, safety gloves and safety glasses must always be worn. Ensure that the work area is adequately ventilated. When working on vehicles at ambient temperatures over 60 °C, all gas cylinders must be removed.	AS00.00-Z-0018-01A
 Warning	Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
	Notes on work safety regulations for vehicles with natural gas-powered engines		AH00.10-B-1000-04A
1	Turn off ignition and remove the key
2	Turn-off the master switch
3	Close the gas valve in the filling box	 Installation: Open the valve slowly to avoid freezing in the gas line.
4	Open the drain (5) of the low-pressure filter (1)
	Note on threaded connections of gas lines		AH47.25-B-0001-01A
5	Release high-pressure hose nut (2) from the low-pressure filter (1)	 Installation: Replace piping sealing ring.
		 Cover piping to avoid dirt.
		 Gas connection nut	*BA07.52-B-1005-01C
		 Record plug	*129589009100
6	Release gas piping hose nut (3) from the low-pressure filter (1)	 Installation: Replace piping sealing ring.
		 Cover piping to avoid dirt.
		 Gas connection nut	*BA07.52-B-1005-01C
		 Record plug	*129589009100
7	Release screws (4) and replace low pressure gas filter (1)	 Fastening of fuel filter to support	*BA47.20-B-1006-02A
8	Install in reverse order
	Check
9	Check gas system	 Installation: Apply soap lye around the connections and check for bubble formation.

 Fuel distributor

Number	Designation		Engine 926.988/996 in model 382.180/181/189
BA07.52-B-1005-01C	Gas connection nut	Nm	55

 Fuel filter

Number	Designation		Engine 924.9; 926.9
BA47.20-B-1006-02A	Fastening of fuel filter to support	Nm	65

129 589 00 91 00

Record plug

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