How to carry out replacement: Spark Plug 230 CE 2.3 (123.243) MERCEDES-BENZ COUPE (C123)
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Change MERCEDES-BENZ COUPE (C123) 280 CE 2.8 Spark Plug yourself – manuals and video tutorials

How to change spark plugs on MERCEDES-BENZ W123 Coupe (C123) – replacement guide

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When to replace the Spark Plug on your MERCEDES-BENZ Baureihe 123
Recommended replacement interval for the part category Spark plug : 20000 km
Important!
This replacement procedure can be used for:
MERCEDES-BENZ W123 Coupe (C123) 230 CE (123.243) … 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 W123 Coupe (C123) and other MERCEDES-BENZ models
How to change Spark plug on MERCEDES-BENZ COUPE (C123) 230 CE 2.3 (123.243) – step-by-step instructions for straightforward car repair Spark plug
How to change Spark plug on W123 Coupe (C123) – tips for proper car maintenance
Spark plug for W123 Coupe (C123) Petrol (136 hp)
Tools
Replacement: spark plugs – MERCEDES-BENZ COUPE (C123). 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
Buy tools
Replacement: spark plugs – MERCEDES-BENZ COUPE (C123). Professionals recommend:
  • The replacement procedure is the same for all spark plugs.
  • Warning! Shut down the engine before starting any work – MERCEDES-BENZ COUPE (C123).
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
    How to change Spark Plug on MERCEDES-BENZ COUPE (C123) 1977 - free PDF and video manuals
    Disconnect the earth cable terminal from the battery. Use a combination spanner #10.
  2. Step 4
    How to replace MERCEDES-BENZ W123 Coupe (C123) 230 CE 2.3 (123.243) 1978 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
    MERCEDES-BENZ COUPE (C123) 280 CE 2.8 1979 Spark Plug replacement: free workshop manuals
    Remove the fastening bolts.
  4. Step 6
    Changing Spark Plug on MERCEDES-BENZ W123 Coupe (C123) 280 C 2.8 (123.050) 1980 by yourself
    Remove the inlet pipe.
  5. Step 7
    How to remove MERCEDES-BENZ Baureihe 123 300 C 3.0 Turbo Diesel (123.153) 1981 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 W123 Coupe (C123) 1982: 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-BENZ COUPE (C123) 300 CD (123.153) 1983 - download illustrated guide
    Unscrew the spark plugs. Use the spark plug socket #16. Use a ratchet wrench.
  8. Step 10
    Need to know how to renew Spark Plug on MERCEDES-BENZ Baureihe 123 1984? This free workshop manual will help you to do it yourself
    Take out the spark plugs.
  9. Step 11
    Changing of Spark Plug on MERCEDES-BENZ COUPE (C123) 1985 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 Baureihe 123 280 CE 2.8 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-BENZ COUPE (C123) 1978 230 CE 2.3 (123.243) 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 COUPE (C123). 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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