How to carry out replacement: Spark Plug 300 3.0 Turbo Diesel (123.193) Mercedes S123
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Change Mercedes S123 250 2.5 (123.086) Spark Plug yourself – manuals and video tutorials

How to change spark plugs on MERCEDES-BENZ W123 Estate (S123) – replacement guide

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Download your free tutorial and fix MERCEDES-BENZ W123 Estate (S123) 200 2.0 (123.280) problems yourself Download for free 1.09 MB Spark Plug for Mercedes S123 Shop now
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When to replace the Spark Plug on your MERCEDES-BENZ 123 SERIES
Recommended replacement interval for the part category Spark plug : 15000 km
Important!
This replacement procedure can be used for:
MERCEDES-BENZ W123 Estate (S123) 200 T (123.280), MERCEDES-BENZ W123 Estate (S123) 200 T, MERCEDES-BENZ W123 Estate (S123) 230 TE (123.283) … 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 Estate (S123) and other MERCEDES-BENZ models
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Simple DIY car repair steps – Replacing Spark plug on W123 Estate (S123)
Spark plug for W123 Estate (S123) Petrol (109 hp)
Easy tricks to help you to replace Spark plug on W123 Estate (S123)
Spark plug for W123 Estate (S123) Petrol (136 hp)
Tools
Replacement: spark plugs – MERCEDES-BENZ KOMBI Estate (S123). 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 KOMBI Estate (S123). Professionals recommend:
  • The replacement procedure is the same for all spark plugs.
  • Warning! Shut down the engine before starting any work – MERCEDES-BENZ KOMBI Estate (S123).
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 S123 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 Estate (S123) 300 3.0 Turbo Diesel (123.193) 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 S123 300 D 3.0 (123.190) 1979 Spark Plug replacement: free workshop manuals
    Remove the fastening bolts.
  4. Step 6
    Changing Spark Plug on MERCEDES-BENZ W123 Estate (S123) 230 TE 2.3 (123.283) 1980 by yourself
    Remove the inlet pipe.
  5. Step 7
    How to remove MERCEDES-BENZ 123 SERIES 280 TE 2.8 (123.093) 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 Estate (S123) 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 S123 240 D 2.4 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 123 SERIES 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 S123 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 123 SERIES 250 2.5 (123.086) 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 S123 1977 300 3.0 Turbo Diesel (123.193) 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 KOMBI Estate (S123). 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 W123 Estate (S123) Spark Plug replacement - online guide
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