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Valve - N276- -arrow-. – Counterhold at the housing hex bolt and loosen the union nut. Then remove it by hand. – Extract the contamination from the rail element bore (threads and sealing surface). Do not use mechanical tools. Note Seal the rail element bore immediately with a suitable plug to pre‐ vent contaminants from entering. Installing: Note ♦ Check the Fuel Pressure Regulator Valve - N276- sealing sur‐ face and threads for damage. ♦ Check the sealing surface on the rail element bore. ♦ The threads on the Fuel Pressure Regulator Valve - N276- must be free of oil and grease. – First tighten the union nut on the Fuel Pressure Regulator Valve - N276- by hand. – Align the Fuel Pressure Regulator Valve - N276- so the con‐ necting line is not taut after connecting the electrical connec‐ tor. – Counterhold at the housing hex bolt and tighten the union nut: – After installing, let the engine run at a moderate speed for a few minutes and then stop it. – Check the fuel system for leaks. Refer to ⇒ “3.10 Fuel System, Performing Leak Test”, page 329 – Read the DTC memory for the Engine Control Module - J623- again. Refer to Vehicle Diagnostic Tester in “Guided Func‐ tions”. – Install the engine cover. Refer to ⇒ “1.4 Engine Cover, Removing and Installing”, page 90 . 3.7 Fuel Pressure Sensor - G247- , Remov‐ ing and Installing Function ted in the rail element (high pressure reservoir). It measures the current fuel pressure in the high pressure system and delivers a voltage signal to the Engine Control Module - J623- . controlled via an Engine Control Module - J623- characteristic map (maximum engine speed is limited to approximately 3000 RPM in emergency operation mode). 3. Diesel Direct Injection System 323 |