| The fuel pressure regulating valve -N276--5- is located in the fuel distributor. |
Note | The fuel pressure regulating valve -N276- is not reusable. |
| Observe safety measures and rules of cleanliness when undertaking all work on the fuel system → Chapter. |
WARNING | Wear protective gloves and protective googles when working with grease remover! |
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Note | No grease remover must get into the plug connection, carefully clean. |
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| Also clean the thread area of the fuel pressure regulating valve -N276- with a grease remover. No dirt must get into the hole of the fuel distributor. |
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| Dry fuel pressure regulating valve -N276- |
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| Disconnect the plug at the fuel pressure regulating valve -N276-. |
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| Counterhold the fuel pressure regulating valve -N276- on the hexagon and slacken the screwed connection using a wrench. |
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| Unscrew the screwed connection by hand and remove the fuel pressure regulating valve -N276- from the fuel distributor. |
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| Remove dirt from the thread, the sealing surface and the hole in the fuel distributor. To do so do not use any mechanical tools. |
Note | Close the fuel distributor hole immediately with a suitable screw plug in order to prevent dirt from penetrating. |
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| The fuel pressure regulating valve -N276- does not have a gasket ring but a biting edge. |
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| The fuel pressure regulating valve -N276- is not reusable. |
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| The O-ring seals the high-pressure side from the low-pressure side and must be replaced. |
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| Before installing, moisten the O-ring and the hole in the fuel distributor with diesel fuel. |
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| Pay attention to damage of the biting edge and the thread of the new fuel pressure regulating valve -N276-. |
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| Also check the sealing surface in the fuel distributor. |
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| Screw in the screwed connection and tighten by hand. |
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| Align the fuel pressure regulating valve -N276- in such a way that the connecting line is routed tension-free after fitting on the plug. |
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| Counterhold the fuel pressure regulating valve -N276- on the hexagon and tighten the screwed connection to 80 Nm using a wrench. |
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| After installing, start the engine and let it run at an average speed for a few minutes. |
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| Switch off the engine and check the fuel system for tightness → Chapter. |
Note | If the fuel pressure regulating valve -N276- was replaced, the initialisation values of the regulating valve must be reset → Vehicle diagnostic tester, „Targeted functions“; „Reset initialisation values of the regulating valve for the fuel pressure“. |
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