Replace spark plugs

AP15.10-W-1580LA

Replace spark plugs

19.11.2019

Engine

936.9 in model 956

with code M2H (Engine M936G, 222 kW (302 hp),1200 Nm)

Engine

936.9 in model 963.003/020

with code JM2H (Engine M936G, R6, 7.7 l, 222 kW (302 hp), 1200 Nm.)

Modification notes

19.02.2019

"AP15.10-W-1585-01LA Replace insulating hoses of ignition coils" reference added.

Operation step 2.

1

Ignition coil

2

Insulating hose

3

Spark plug

 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

 Danger

Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

Notes on working on natural gas powered vehicles

AH00.10-N-1000-06A



Remove

1

Remove ignition coils (1).



Model 956

AR15.12-W-2003NG



Model 963

AR15.12-W-2003HA

2

Replace insulating hoses (2) of ignition coils.

AP15.10-W-1585-01LA

3

Remove spark plugs (3).

 Spark plug wrench

*112589010900



Install

4

Screw in new spark plugs (3).

 Use only approved spark plugs (3).

 Spark plug to cylinder head

*BA07.54-N-1002-01E

 Spark plug wrench

*112589010900

5

Install ignition coils (1).



Model 956

AR15.12-W-2003NG



Model 963

AR15.12-W-2003HA

6

Document replacement of spark plugs (3) in inspection log book for natural gas system.

 The inspection logbook is part of the vehicle maintenance booklet.

 Gas injection and ignition system

Number

Designation

Engine 936.9 in model 963.003/020
with code JM2H (Engine M936G, R6, 7.7 l, 222 kW (302 hp), 1200 Nm.)

Engine 936.9 in model 956
with code M2H (Engine M936G, 222 kW (302 hp),1200 Nm)

BA07.54-N-1002-01E

Spark plug to cylinder head

Nm

35

35