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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 210 (Exhaust System (CUMMINS 5.0L)) >> Removal And Installation >> Def Dosing Valve >> Removal and Installation >> Removal

Removal and Installation: Removal

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
  • To reduce the risk of personal injury, do not get Diesel Exhaust Fluid (DEF) in your eyes as it contains urea. In case of contact, immediately flush eyes with large amounts of water for a minimum of 15 minutes. Do not swallow. In the event DEF is ingested, contact a physician immediately. Reference the Safety Data Sheet (SDS) for additional information.
  • During regeneration, exhaust gas temperature can reach 800°C (1500°F), and exhaust system surface temperature can exceed 700°C (1300°F), which is hot enough to ignite or melt common materials, and to cause serious personal injury. The exhaust and exhaust components can remain hot after the vehicle has stopped moving. To avoid the risk of fire, property damage, burns or other serious personal injury, allow the exhaust system to cool before beginning this procedure or repair and make sure that no combustible materials are located where they are likely to come in contact with hot exhaust or exhaust components.
  • The DEF line connecting the after treatment DEF dosing unit to the after treatment DEF dosing valve is under low pressure and should not be disconnected while the engine is running or before the system has completed the purge process after engine shutdown. Disconnecting the DEF line while under low pressure could cause DEF to spray.
  1. Disconnect the battery or batteries. Refer to Battery Disconnect .
    WARNING: Battery acid and battery acid fumes are extremely dangerous and can cause severe burns and explosion. To help reduce the risk of personal injury;
    • Wear appropriate goggles and protective clothing.
    • Always properly ventilate the area where the service is being performed.
    • Never allow battery fluid to come in contact with skin, eyes, fabrics or painted surfaces.
    • To avoid arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.
    • If acid contacts eyes, skin or clothing, immediately flush with water for 15 minutes and seek medical attention.
    NOTE: Do not disconnect the vehicle batteries until the DEF dosing system has completed the purge cycle. Before beginning to remove and/or disconnect any components, wait at least 5 minutes after the push-button ignition switch is turned OFF for the DEF dosing system to purge the DEF from the system. The purge cycle is an automatic process and does not require intervention to occur. The DEF dosing unit will create an audible pumping noise during the purging process.
  2. Disconnect the DEF dosing valve harness connector and DEF supply line.
    CAUTION: To avoid damage, do not kink or bend tubing or lines. Ensure all tubes and lines are routed and installed properly and care is given during the disassembly and assembly process. Failure to do so can result in damage to the tubes, lines or surrounding components.
    NOTE: When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spilling.
  3. Remove the bolts (A) and washers (B) that secure the DEF dosing valve (1) to the decomposition tube.
    GNSALBIA1724Z-724Courtesy of NISSAN NORTH AMERICA, INC.
    NOTE:
    • A small amount of DEF deposits is normal if observed on the DEF dosing valve face and around the gasket of the DEF dosing valve.
    • Place a protective cap over the decomposition tube to prevent any dirt or debris from entering the system.

    (2)

    : Gasket
  4. Remove the DEF dosing valve.
    CAUTION: To avoid possible damage to the Diesel Exhaust Fluid (DEF) system dosing valve, the following should be followed:
    • Care should be used when handling the DEF dosing valve as the spray nozzle is delicate and damage may occur.
    • Never set the dosing valve down on the spray nozzle.
    • Use caution when disconnecting the dosing valve connections.
    • Do not stress the dosing valve fluid connectors as they can be easily damaged.
  5. Remove the gasket.
    NOTE:
    • Do not reuse the gasket.
    • The gasket can become brittle and adhere to either the decomposition tube or DEF dosing valve. Do not drop gasket material into the decomposition tube when removing. Apply an alcohol-based solution or water to the gasket to soften its composition. Using suitable tools, remove the gasket if necessary.
    • Cover decomposition tube opening after removing gasket to prevent debris from entering.
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