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Recommended Torque and Tightening Angle for DENSO plugs.
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Use the correct wrench for the hex on the plug, and be careful not to damage the insulator. |
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When changing, make sure that the oil, etc. on the outside of the plug does not enter the engine interior. |
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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. |
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Make sure the plugs are vertical, and tighten them by hand until they cannot be tightened any further. |
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Then, use a plug wrench to tighten them accurately to the torque or rotation angle showed in the chart below. |
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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. |
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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. |
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| Thread Size |
Applicable Models |
Recommended
Torque
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Recommended Tightening Angle
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| 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 |
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(*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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