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Spark plugs are constructed by using two different manners of sealing in cylinder head. After threading the spark plugs into the cylinder head until they’re seated, torque each spark plug to 20 ft-lbs of torque; DO NOT OVER TORQUE THE SPARK PLUGS! Clymer States 20 ft/ lbs for The spark plugs but I Am Double Checking as I Know Zoro Found one listing in The Clymer That was incorrect. Then a spark plug wrench should be used to tighten the spark plug by turning an additional angle as follow: Sealing with a gasket (washer) - spark plugs can never be mounted into cylinder head without a sealing gasket (washer). Torque directly affects the ability of the spark plug firing end to dissipate heat to the cylinder head. Care must be taken when torquing spark plugs, especially in softer aluminum cylinder heads. NGK ZFR5F-11 (2622) spark plug with gasket. 2. The proper torque of a spark plug can only be achieved using a torque wrench. This according to both the Chilton manual and the owner's manual. See the illustration above. 1/2-2/3 turn on plugs with a gasket. 1/16 turn on plugs with a tapered seat. Don't know about every one but not having a feel for inch pounds my mind automatically wants foot pounds to be able to close out the thought and at a conversion of 12 inch pounds per foot pound would equal 9.58 . can all have an effect on how much torque is required to seat the spark plug correctly. for the size and thread style of plugs used in FICHT, DI, and E-TEC engines. Torque is one of the most critical aspects of spark plug installation. 1/16 turn on plugs with a tapered seat. However in order to ensure proper seating of a conical seat spark plug, it is a good idea to torque the spark plug, loosen it a 1/4 turn and torque it again. Tighten used plugs 30°. Note: If using a torque wrench vs. plug wrench, please refer to the Torque Recommendations chart below. 1/12-1/8 turn on plugs with a tapered seat. On the box its saying Aluminum heads and spark plugs with gasket torque to 18-21 ft lbs. Without a Torque Wrench: If a torque wrench is unavailable, finger tighten the spark plug, then use a plug wrench to tighten. When replacing spark plugs without spark plug torque wrench, spark plugs should be threaded-in by spark plug removal and installation tool, or socket by hand (without spark plug wrench) untill they fully seat. 180Marty thanked for this post 04-01-2017, 11:20 AM #2 Reinstall the ignition coils, wiring connectors, and wiring harness; torque the ignition and wiring harness bolts to 8 ft-lbs or just snuggly by hand. It is extremly important not to exceed the installation torque. To gap spark plugs always use a spark plug gapping tool. Clean threads will allow for a proper seal and maximum performance. 1/16 turn on plugs with a tapered seat. It is 11 lbs ft. Or 132 lbs in. The area around the spark plugs should be cleaned with compressed air (or air in the can) to prevent foreign debree from falling into the combustion chamber. Thanks Providing it's accurate, is there really a risk of over torquing? Autolite - For spark plugs with a gasket: 1/4 turn on 10mm plugs, 3/8 turn on 12mm plugs, 1/2 turn on 14mm and 18mm plugs. Without a Torque Wrench: If a torque wrench is unavailable, finger tighten the spark plug, then use a plug wrench to tighten. One of my old plugs was stripped, and so was the hole into which it threads. Personally, I do not use a torque wrench on plugs and trust feel more than a spec that may cause more trouble than any help it offers. Especially as the plug has a tapered seat on it. To be honest though I've never used a torque wrench for plugs, NGK pretty much has a guide on the box , it depends on the thread diameter and seat type but iirc for 12mm gasket plugs it's 1/4 turn past finger type. However, it is possible to tighten the plugs satisfactorily without a torque wrench. For proper spark plug installation, it is always highly recommended to use spark plug removal and installation tool and spark plug torque wrench. At 374K miles, this is my third set of plugs that I have installed and never had an issue before. 4. The torque is 18 ft. lbs. I had to clean up the threads with a tap (same size) and luckily that worked fine. Spark Plug Installation. The torque leaving the diff is equal to both shafts but is less at the wheel with the longer shaft due to the twisting. Dielectric grease prevents missfires, keeps the moisture out, and ease the future removal of the spark plug wire or the spark plug boot. The production line used to specify up to 30 ft.-lbs and that is where the higher torque … The table below lists the torquing specifications for most spark plugs being installed in either cast iron or aluminum cylinder heads. 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