AR47.25-W-0004H | Remove/install check valve | 7.8.09 |
ENGINE 902.9, 906.9 in MODEL 957 with CODE (MS8) natural gas engine
W47.25-1006-05
1 Check valve
2 Filling connection
3 High-pressure gas line
Modification notes
30.7.09 | Note on threaded pipe connections for gas pressure lines - altered. | ||
Check the gas system for leaktightness in accordance with the national regulations - added. | Step 8 |
| Remove/install | ||
Danger! | Risk of explosion caused by escaping natural gas or by 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. | |
| Notes on work safety regulations for vehicles with natural gas-powered engines | ||
| Note on threaded pipe connections of gas pressure lines | ||
1 | Close gas shutoff valves at compressed-gas tanks | ||
Danger! | Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running | Secure vehicle to prevent it from moving by itself. | |
2 | Start engine and run on idle until it engine goes off by itself | In this way residual gas is used up in the lines and components. | |
3 | Switch off ignition | ||
4 | Remove bracket of high-pressure gas line (3) on compressed-gas tank unit support | ||
5 | Remove high-pressure gas line (3) | ||
6 | Remove check valve (1) on the gas line to the filler connection (2) | Installation: Pay attention to direction of installation of check valve (1); the arrows must point towards the cross threaded connection of gas pipe. | |
7 | Install in the reverse order | ||
8 | Check the gas system in accordance with the national regulations for leaktightness | In Germany the GAP is performed according to §41a of the German vehicle licensing regulations. |