Tighten threaded connections for high-pressure gas pipes

AR47.25-D-0005A

Tighten threaded connections for high-pressure gas pipes

20.09.2019

Engine

111.979 in model 902.012/062/072, 903.012/013/022/062/063/072/073, 904.012/013/062

with code KL9 (Underfloor gas pressure container)

with code MS7 (NGT (Natural-Gas Technology) Sprinter)

Engine

111.979 in model 902.061/062, 903.061/062/063, 904.062/063

with code KL8 (Gas pressure container in load space)

with code MS7 (NGT (Natural-Gas Technology) Sprinter)

Engine

111.984 in model 902.612/662/672, 903.612/613/622/662/663/672/673, 904.612/613/662

with code KL9 (Underfloor gas pressure container)

with code MS7 (NGT (Natural-Gas Technology) Sprinter)

Engine

111.984 in model 902.661/662, 903.661/662/663, 904.662/663

with code KL8 (Gas pressure container in load space)

with code MS7 (NGT (Natural-Gas Technology) Sprinter)

1

Clamping ring (front)

2

Clamping ring (rear)

3

Union nut

4

Line

A

Distance

Tightening

 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

Note on threaded connections of gas lines

AH47.25-N-0001-01A

1

Check fasteners

 Check the union nut (3), the clamping ring (1, 2) as well as the counterpart for damage. The space (A) between the clamping rings (1, 2) must be at least 1 mm. If the space (A) is smaller or if damage is established on the fasteners then the respective component or the gas pressure line in question must be replaced.

2

Tighten union nut (3) such that it is finger-tight and mark position in relation to fitting

 Turn union nut (3) until an increased resistance can be felt.

3.1

Continue to turn the union nut (3) through a tightening angle of 180°

In case of initial installation.

3.2

Continue to turn the union nut (3) through a tightening angle of 90°

In case of re-installation.

4

Check gas system for leaktightness in accordance with the national regulations

AR07.54-D-0001NG

 In Germany the gas system inspection (GAP) should be performed according to §41a of the German vehicle licensing regulations.