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SPARK PLUG INSTALLATION
Recommended Torque and Tightening Angle for DENSO plugs.

Use the correct wrench for the hex on the plug, and be careful not to damage the insulator.
When changing, make sure that the oil, etc. on the outside of the plug does not enter the engine interior.
When putting the plugs in, clean the engine side of the flange, and put in the plugs after making sure the gasket is in the flange.
Make sure the plugs are vertical, and tighten them by hand until they cannot be tightened any further.
Then, use a plug wrench to tighten them accurately to the torque or rotation angle showed in the chart below.
Recommended Torque and Tightening Angle for DENSO plugs. Recommended Torque and Tightening Angle for DENSO plugs.
Caution If a thread lubricant such as grease is coated on the thread, tightening to the recommended torque is tightening too much;
this has been linked to seal leakage.
Do not use a thread lubricant.
Caution Tightening more than the tightening angles and torques shown on the right could result in damage to the engine and furthermore could result in the plug coming off at the thread.
Thread Size Applicable Models Recommended
Torque
Recommended Tightening Angle
New Plug Previously Used
M8 All Types 8-10N ・m About 1 turn About 1/12 turn
M10 Types other than the ones shown below 10-15N ・m About 1/3 turn About 1/12 turn
M10 UFE, IUH, VUH, VNH Types 10-15N ・m About 2/3 turn About 1/12 turn
M10 Stainless Gasket Type(*1) 10-15N ・m About 3/4 turn About 1/12 turn
M12 All Types 15-20N ・m About 1/3 turn About 1/12 turn
M14 Types other than the ones shown below 20-30N ・m About 1/2 turn About 1/12 turn
M14 Stainless Gasket Type(*2) 20-30N ・m About 2/3 turn About 1/12 turn
M18 All Types 30-40N ・m About 1/4 turn About 1/12 turn
M14 Taper seat All Types 20-30N ・m About 1/16 turn About 1/16 turn
(*1)IUH27ES, U24FER9S
(*2)PK22PR-L11S, SK22PR-M11S, IK16G, IK20G, IK22G, VK16G, VK20G, VK22G, K20PR-SU9, SK20PR-L9S, SKJ20DR-M11S, KJ20DR-M11S, K20PR-L11S


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