How to change spark plugs on MERCEDES-BENZ SL (R129) V6 – replacement guide
MERCEDES-BENZ SL (R129) 320 (129.064), MERCEDES-BENZ SL (R129) 280 (129.059), MERCEDES-BENZ SL (R129) 320 (129.063), MERCEDES-BENZ SL (R129) 300 SL-24 (129.061), MERCEDES-BENZ SL (R129) 280 (129.058) … 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
Spark plug
- The replacement procedure is the same for all spark plugs.
- All work should be done with the engine stopped.
- Step 1
Open the hood.
Step 2Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
Step 3
Remove the engine cover.
AUTODOC recommends:Replacement: spark plugs – MERCEDES-BENZ SL (R129) V6. Do not use excessive force when removing the part as this may damage it.
- Step 4
Remove the air intake hoses.
- Step 5
Clean the air filter cover and housing.
Replacement: spark plugs – MERCEDES-BENZ SL (R129) V6. Tip:Before cleaning the air filter cover and housing, cover the air duct parts, mass airflow sensor (if available), throttle valve with a clean cloth.
- Step 6
Remove the air filter housing.
AUTODOC recommends:Do not apply excessive force when removing the part. Otherwise you may damage it.
- Step 7
Cover the throttle body with a microfibre towel to prevent dust and dirt from getting into the system.
- Step 8
Unplug the connectors from the ignition coils.
- Step 9
Remove the spark plug wire connectors from the spark plug wells. Use long round nose pliers.
Replacement: spark plugs – MERCEDES-BENZ SL (R129) V6. Tip from AUTODOC:Be careful to avoid damaging spark plug wires.Remember the sequence of the spark plug wires connectors.
- Step 10
Unscrew the fasteners of the ignition coils. Use Torx T30. Use a ratchet wrench.
- Step 11
Take out the ignition coil from the spark plug well.
Replacement: spark plugs – MERCEDES-BENZ SL (R129) V6. AUTODOC experts recommend:Remember the sequence of steps for ignition coil demounting.
- Step 12
Clean dirt, dust and debris from inside the spark plug wells.
- Step 13
Unscrew the spark plugs. Use the spark plug socket #16. Use a ratchet wrench.
- Step 14
Take out the spark plugs.
- Step 15
Apply a thin layer of a special high temperature anti-seize lubricant to the threads of the new spark plugs.
- Step 16
Install the new spark plugs into their mounting seats.
- Step 17
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 SL (R129) V6. Professionals recommend: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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