Torque wrench for spark plugs ?
Is a torque wrench necessary for replacing spark plugs ?
A mechanic can put alot together without a torque wrench, it comes with experience. Mechanics sees plenty of screwed up spark plugs and threads by amateurs, and if you don’t have more than five years experience, I suggest to use the torque wrench and do the job.
The plug needs to be tightened to the correct specification. If you don’t know what than feels like then yes you need to use a torque wrench.
All fasteners have a torque specifications.
Over-tightening can deform and brake parts, under-tighten and it will fall apart. A click type torque wrench that has the range you need is all that’s needed.
Spark plugs with gasket-style seats require more torque than those with taper seats. Always follow vehicle manufacturer torque recommendations, but as a general rule:
* 14-mm plugs with a gasket-style seat should be tightened to 26 to 30 ft.-lbs. in cast iron heads, but only 18 to 22 ft.-lbs. in aluminum heads.
* 18-mm plugs with gasket-style seats should be tightened to 32 to 38 ft.-lbs. in cast iron heads, but only 28 to 34 ft.-lbs. in aluminum heads.
* 14-mm taper seat spark plugs should be tightened to 7 to 15 ft.-lbs. in both cast iron and aluminum.
* 18-mm taper seat spark plugs should be tightened to 15 to 20 ft.-lbs. in both types of heads.
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