I own a Husqvarna R322T AWD Rider with a 22hp B&S engine. I replaced the spark plugs with stock Champion RC12YC plugs last fall. Briggs says on their website that their torque spec is 7-15 ft. lb. of torque (which is 84-180 in. lb)
They make sure to note that 15 ft. lbs. is the MAXIMUM torque that can be used, but imply that if one can use less... then use less. When I installed the plugs, I didn't know about the 7-15 range, and so installed them with a torque wrench at 180 in. lb. (the full 15 ft. lb.)
Right after installing, the engine began to smoke at start-up quite a bit. It wouldn't continue after it ran for some time, but it was noticeable, and wasn't there before I changed the plugs.
So, I undid the new plugs, and re-torqued them to 120 in. lb (10 ft. lb.), and now all the smoking on startup has gone away... it's just as it was before the new plugs were installed.
So why did that happen? I didn't over-torque the plugs at 15 ft lb, or damage the threads, but clearly that extra 60 in. lb. made some difference that caused the smoke. Anyone know why?
They make sure to note that 15 ft. lbs. is the MAXIMUM torque that can be used, but imply that if one can use less... then use less. When I installed the plugs, I didn't know about the 7-15 range, and so installed them with a torque wrench at 180 in. lb. (the full 15 ft. lb.)
Right after installing, the engine began to smoke at start-up quite a bit. It wouldn't continue after it ran for some time, but it was noticeable, and wasn't there before I changed the plugs.
So, I undid the new plugs, and re-torqued them to 120 in. lb (10 ft. lb.), and now all the smoking on startup has gone away... it's just as it was before the new plugs were installed.
So why did that happen? I didn't over-torque the plugs at 15 ft lb, or damage the threads, but clearly that extra 60 in. lb. made some difference that caused the smoke. Anyone know why?
