Regarding to the spark plugs, you should to know these

 Life time

Please change the spark plugs every 30000kms or every year for auto, which comes early and every 8000kms for motorcycle.

 Installation

When you install the spark plug with the wrenches, firstly, screw spark plug into cylinder by hand till the seal washer (taper face) contacting the cylinder cover, and then screw the spark plug tightly with the wrench.

 The following sheet shows torque data. (The maximum torque force is suitable for new spark plug without lubricant in the thread; while the maximum torque force should decrease about one third for lubricated threads to avoid the overstress)  

Spark Plug Installation

Iron Cylinder Cap

Aluminum Cylinder Cap

M10 x 1   (flat seat)

10~15N .m

10~15N .m

M12 x 1.25(flat seat)

15~25N .m

15~25N .m

M14 x 1.25(flat seat)

20~40N .m

20~30N .m

M14 x 1.25(cone seat)

15~25N .m

10~20N .m

M18 x 1.5 (flat seat)

30~45N .m

20~35N .m

M18 x 1.5 (cone seat)

20~30N .m

15~23N .m

When you install the spark plug with simple wrenches, firstly, screw spark plug into cylinder by hand till the seal washer (taper face) contacting the cylinder cover, and then screw the spark plug clockwise 90 degrees with the wrench.

 When you install the spark plug with simple wrenches, firstly, clean the dust on the cylinder cover, and then screw spark plug into cylinder by hand till the seal washer (taper face) contacting the cylinder cover, and then screw the spark plug clockwise 15 degrees with the wrench. 

Fault Analysis

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Post time: Jun-06-2019