When to replace the Spark Plug on your MERCEDES-BENZ G-CLASS
Recommended replacement interval for the part category Spark plug : 2 year / 30000 km
Important!
This replacement procedure can be used for:
MERCEDES-BENZ G-Class Off-Road (W463) G 320 (463.230, 463.231) View more

The steps may slightly vary depending on the car design.

This video shows the replacement procedure of a similar car part on another vehicle

All the parts you need to replace – Spark Plug for G-Class Off-Road (W463) and other MERCEDES-BENZ models
Tools
Replacement: spark plugs – MERCEDES-BENZ G-CLASS (W463). List of the tools you'll need:
High-temperature anti-seize lubricant
Drive socket # 10
Spark plug socket # 16
HEX bit no.H6
Ratchet wrench
Torque wrench
Flat Screwdriver
Fender cover
Replacement: spark plugs – MERCEDES-BENZ G-CLASS (W463). AUTODOC recommends:
  • The replacement procedure is the same for all spark plugs.
  • Please note: all work on the car – MERCEDES-BENZ G-CLASS (W463) – should be done with the engine switched off.
Carry out replacement in the following order:
  1. Step 1
    Open the hood.
    Step 2
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
    Step 3
    How to change Spark Plug on Mercedes W463 1989 - free PDF and video manuals
    Remove the front cover of the engine.
    AUTODOC recommends:
    Replacement: spark plugs – MERCEDES-BENZ G-CLASS (W463). Do not use excessive force when removing the part as this may damage it.
  2. Step 4
    How to replace MERCEDES-BENZ G-Class Off-Road (W463) 300 GD (463.327, 463.328) 1990 Spark Plug - step-by-step manuals and video guides
    Unscrew the fastener of the mass air flow sensor. Remove the part. Use a flat screwdriver.
  3. Step 5
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    Detach the air intake hose clamp. Use a flat screwdriver.
  4. Step 6
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    Remove the crankcase ventilation hose. Use a flat screwdriver.
  5. Step 7
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    Disconnect the air intake pipe from the air filter housing.
  6. Step 8
    How to replace Spark Plug on MERCEDES-BENZ G-Class Off-Road (W463) 1994: download PDF manuals and video instructions
    Dismantle the air filter pipe.
  7. Step 9
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    Unscrew the engine cover fastener. Use HEX No.H6. Use a ratchet wrench.
  8. Step 10
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    Remove the engine cover.
    Replacement: spark plugs – MERCEDES-BENZ G-CLASS (W463). Tip from AUTODOC:
    Do not apply excessive force when removing the part. Otherwise you may damage it.
  9. Step 11
    Changing of Spark Plug on Mercedes W463 1997 won't be an issue if you follow this illustrated step-by-step guide
    Unscrew the fasteners of the ignition coils. Use a drive socket #10. Use a ratchet wrench.
  10. Step 12
    MERCEDES-BENZ G-CLASS G 320 CDI 3.0 (463.340, 463.341, 463.343) Spark Plug replacement: online guides and video tutorials
    Unplug the connectors from the ignition coils. Use a flat screwdriver.
  11. Step 13
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    Remove the spark plug wire connectors from the spark plug wells.
    AUTODOC recommends:
    Be careful to avoid damaging spark plug wires.Remember the sequence of the spark plug wires connectors.
  12. Step 14
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    Take out the ignition coils from the spark plug wells.
    Replacement: spark plugs – MERCEDES-BENZ G-CLASS (W463). AUTODOC recommends:
    Remember the sequence of steps for ignition coil demounting.
  13. Step 15
    Clean dirt, dust and debris from inside the spark plug wells.
    Step 16
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    Unscrew the spark plugs. Use the spark plug socket #16. Use a ratchet wrench.
  14. Step 17
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    Take out the spark plugs. Use the spark plug socket #16.
  15. Step 18
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    Apply a thin layer of a special high temperature anti-seize lubricant to the threads of the new spark plugs.
  16. Step 19
    Install the new spark plugs into their mounting seats. Use the spark plug socket #16.
    Step 20
    How to change Spark Plug on Mercedes W463 1989 - free PDF and video manuals
    Screw new spark plugs and tighten them. Use the spark plug socket #16. Use a torque wrench. Tighten it to 27 nm torque.
    Replacement: spark plugs – MERCEDES-BENZ G-CLASS (W463). Tip from AUTODOC:
    Don't tighten the plugs with excessive force. Exceeding tightening torque can damage the thread connection.Be careful when working with a spark plug wrench. Its skewing can cause damage to the threaded connection.
  17. Step 21
    How to replace MERCEDES-BENZ G-Class Off-Road (W463) 300 GD (463.327, 463.328) 1990 Spark Plug - step-by-step manuals and video guides
    Install the ignition coils to the spark plug wells. Make sure you hear a click indicating that it is locked in place.
    Replacement: spark plugs – MERCEDES-BENZ G-CLASS (W463). Professionals recommend:
    Follow the installation sequence.
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DIY MERCEDES-BENZ G-Class Off-Road (W463) Spark Plug replacement - online guide
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