Over tightening can cause damage to the threads in the cylinder head and the threads of the spark plug, stress the spark plugs internal seal, or fracture the spark plugs insulator. Tightening the spark plugs to the proper torque value is an important consideration. For those installing plugs without a torque wrench, let me be a little more specific: New plugs come with a "crush" washer that is designed to flatten out upon installation. If you have a friend with one, borrow it to get used to how tight to get the plug. 5.0 out of 5 stars. you have to use an inch pound torque wrench. plugs slowly you can actually feel the washer as it flattens out. Spark plugs cannot be over-tightened in order to avoid damage to the threads in the spark plug holes. EPAuto 3/8-Inch Drive Click Torque Wrench (10-80 ft.-lb. Normally a small torque wrench is recommended for tightening. PLEASE NOTE: Torque recommendations are for spark plugs with new gaskets. If using anti-seize compound, use sparingly and reduce torque by 30%. An easy way to tightening plugs is this: Turn all the plugs until they are pinched by hand. All along I had been over torquing the plugs. The first time I used a torque wrench on my bikes spark plugs I got a big surprise. I'm also a US peasant, so I'd prefer to avoid paying customs if I can. The first time I decided , "I should really do this properly", and used a torque wrench on some new plugs I very quickly thought, "you've gotta be kidding", as I felt it getting up to where I'd normally stop, and the torque wrench was telling me to keep going as I was miles away. Too much torque distorts the plug. Based on a tip from the other site I duct taped together the spark plug wrench to a 5/8" socket and then taped to a 10" extension. 12 foot pounds equals 144 inch pounds so I grabbed my super accurate Snap On Dial Torque wrench and got busy. Most spark plugs (flat seat and gasket type) have a 'crush washer' or gasket which becomes compressed during the initial installation, this allows around half a turn of the plug to be made once contact with the cylinder head has been made by the gasket. A taper seat spark plug will get tight 1/6 of a turn after initial tightening . If you used anti-seize compound on the plug threads, reduce torque … If you tighten the (cold!) I just replaced my spark plugs today and used a torque wrench. Brand New. But if it has the proper range of torque it should be fine. I've never used a torque wrench for spark plugs but i'm old .Make sure you use one that is accurate and be sure to put a little high temperature anti seize on the spark plug threads. Tusk Ratcheting Spark Plug Wrench Ratchet 13/16" Motorcycle Dirt Bike Atv Enduro. A torque wrench is nice to have, but kinda costly. Stretching of the spark plug from overtightening can cause different heat ranges in the plug and possibly cause misfiring. Click & Collect. E. eldudereno New member. I have never used a torque wrench on a spark plug in my life and thats main dealer training for you. Tighten to recommended torque. I've never believed the spark plug torque numbers quoted in books. This video describes the methods to install spark plugs: Using a torque wrench and using installation angles 1/2-2/3 turn on plugs with a gasket. Only caveat is that looks like it might be 1/2" drive wrench and spark plug sockets are 3/8 drive. SPARK PLUG REMOVAL TOOL 10mm / 14mm TOMMY BAR WRENCH SPANNER & SOCKETS (CT4514) 5 out of 5 stars (9) 9 product ratings - SPARK PLUG REMOVAL TOOL 10mm / 14mm TOMMY BAR WRENCH SPANNER & SOCKETS (CT4514) , 2008 Messages 1,611 Reaction score 0 Points 0 Location Newcastle, up North little 20! Dial torque wrench is nice to have, but kinda costly Advanced Garage... how to spark... 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