Installation Key Points
- The threaded area of the cylinder head must be clean.
- Using your fingers, screw the spark plug into the cylinder head, and
tighten about 1/4-1/2 turn with a plug wrench. (Taper seat plug: about 1/16 turn)
- Tightening too much may cause distortion of the plug housing, and in extreme cases could cause engine damage. Therefore, proper installation of the spark plug is important for life and performance of the spark plug.
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Torque Recommendations
This table gives the recommended torque for proper spark plug installation. Improper installation may cause poor performance, and even result in engine damage.
| Plug Size |
Cast Iron Heads |
Aluminum Heads |
| N*m |
lb-ft |
N*m |
lb-ft |
| 10mm Flat Seat |
10-15 |
7-11 |
10-15 |
7-11 |
| 12mm Flat Seat |
15-25 |
11-18 |
15-25 |
11-18 |
| 14mm Flat Seat |
35-40 |
26-30 |
20-30 |
15-22 |
| 14mm Taper Seat |
9-20 |
7-15 |
9-20 |
7-15 |
| 18mm Flat Seat |
43-52 |
32-38 |
38-46 |
28-34 |
| 18mm Taper Seat |
20-27 |
15-20 |
20-27 |
15-20 |
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Note: The installation torque values shown above apply to new spark plugs without lubricating the threads. If threads are lubricated, the torque value should be reduced by approximately 1/2 to avoid over-tightening.
* 1N*m = 0.1020 kgf*m
Installation Procedure
Whenever possible it is recommended that the spark plug should be installed by using a torque wrench. If a torque wrench is not available, tighten in the following manner.
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