Remove/install engine control unit (MR)

AR07.15-W-1630H

17.6.08

ENGINES 902.9, 906.9 in MODEL 957 with CODE (MS8) natural gas engine

W07.54-1005-06

1 Spacer

2 Rubber damper

3 Washer

4 Electrical connector
(vehicle wiring harness)

5 Electrical connector
(engine wiring harness)

6 Bracket

A85 MR gas engine control unit

Y87 Electric-pneumatic converter (EPW)

 	Remove/install
 Danger!	Risk of explosion caused by escaping natural gas or overheated compressed-gas tanks when working on natural gas powered vehicles. Risk of frostbite to parts of the body caused by escaping natural gas and by touching components near the valves when emptying compressed-gas tanks. Risk of poisoning or risk of suffocation caused by inhaling natural gas.	Remove any sources of ignition. Ensure that the work area is adequately ventilated. Wear heat protective gloves.	AS00.00-Z-0018-01A
	Notes on work safety regulations for vehicles with natural gas-powered engines		AH00.10-N-1000-04A
1	Switch off ignition
2	Open maintenance flap
 Danger!	Risk of injury caused by body parts being pinched or crushed as cab is tilted	Ensure that no one is within the tilting range of the cab as it is being tilted. Always tilt the cab all the way to the end position and secure with the safety strut.	AS60.80-Z-0001-01A
3	Tilt cab
	Notes on tilting the cab		AH60.80-N-0003-01A
4	Remove electropneumatic pressure converter (Y87)		AR07.17-W-0002H
5	Remove bracket (6) from gas engine (A85) control unit		*BA07.54-N-1010-01A
6	Release and disconnect electrical connectors (4, 5) at MR control unit, gas engine (A85)	 Release by pressing or swiveling the release pin.
7	Remove gas engine (A85) control unit (MR) from the crankcase.	 The MR control unit, gas engine (A85) must not be disassembled.
		 Installation: Insert all damper rubbers (2) in the gas engine control unit (MR) (A85). Observe the installation position of spacer sleeve (1) and spacer (3).
			*BA07.54-N-1004-01A
8	Install in the reverse order
9	Learn all transponder keys	 Only if a new gas engine (A85) control unit has been installed.	AR80.57-W-0010C

 Gas injection and ignition system

Number	Designation		Engine 902.9 with code MS8, Engine 906.9 with code MS8


BA07.54-N-1004-01A	Bolt, MR control unit to crankcase	Nm	15
BA07.54-N-1010-01A	Bolt, electropneumatic pressure converter bracket to control unit (MR)	Nm	8

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