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
This replacement procedure can be used for:
MERCEDES-BENZ G-Class Off-Road (W461) 230 GE (461), MERCEDES-BENZ G-Class Off-Road (W461) 230 GE (461.238, 461.239) 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 (W461) and other MERCEDES-BENZ models
Replacement: spark plugs – MERCEDES-BENZ G-CLASS (W461). Tools you'll need:
Wire brush
High-temperature anti-seize lubricant
Dielectric grease
Torque wrench
Combination spanner #10
Drive socket # 10
Spark plug socket # 16
Ratchet wrench
Phillips screwdriver
Crow bar
Fender cover
Replacement: spark plugs – MERCEDES-BENZ G-CLASS (W461). Professionals recommend:
  • The replacement procedure is the same for all spark plugs.
  • Warning! Shut down the engine before starting any work – MERCEDES-BENZ G-CLASS (W461).
Carry out replacement in the following order:
  1. Step 1
    Open the bonnet.
    Step 2
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
    Step 3
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    Disconnect the earth cable terminal from the battery. Use a combination spanner #10.
  2. Step 4
    How to replace MERCEDES-BENZ G-Class Off-Road (W461) 250 GD 2.5 1990 Spark Plug - step-by-step manuals and video guides
    Unscrew the inlet pipe fasteners. Use a Phillips screwdriver. Use a drive socket #10. Use a ratchet wrench.
  3. Step 5
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    Remove the fastening bolts.
  4. Step 6
    Changing Spark Plug on MERCEDES-BENZ G-Class Off-Road (W461) 230 GE 2.3 1992 by yourself
    Remove the inlet pipe.
  5. Step 7
    How to remove MERCEDES-BENZ G-CLASS 230 G 2.3 (461.238, 461.239) 1993 Spark Plug - online easy-to-follow instructions
    Disconnect the spark plug wires from the spark plugs.
  6. Step 8
    How to replace Spark Plug on MERCEDES-BENZ G-Class Off-Road (W461) 1994: download PDF manuals and video instructions
    Clean dirt, dust and debris from inside the spark plug wells.
  7. Step 9
    How hard is it to do yourself: Spark Plug replacement on Mercedes W461 G 280 CDI (461.304, 461.334, 461.339, 461.344, 461.390) 1995 - download illustrated guide
    Unscrew the spark plugs. Use the spark plug socket #16. Use a ratchet wrench.
  8. Step 10
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    Take out the spark plugs.
  9. Step 11
    Changing of Spark Plug on Mercedes W461 1997 won't be an issue if you follow this illustrated step-by-step guide
    Apply a thin layer of a special high temperature anti-seize lubricant to the threads of the new spark plugs.
  10. Step 12
    MERCEDES-BENZ G-CLASS 250 GD 2.5 Spark Plug replacement: online guides and video tutorials
    Install the new spark plugs into their mounting seats.
  11. Step 13
    Replacing Spark Plug on Mercedes W461 1999 250 GD 2.5 by yourself
    Screw new spark plugs and tighten them. Use the spark plug socket #16. Use a torque wrench. Tighten it to 22 nm torque.
    Replacement: spark plugs – MERCEDES-BENZ G-CLASS (W461). AUTODOC recommends:
    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.
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DIY MERCEDES-BENZ G-Class Off-Road (W461) Spark Plug replacement - online guide
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