This will help ensure proper seating and adequate heat transfer. If needed, cylinder head threads can be cleaned by spark plug thread chaser in the correct size thread (10mm, 12mm, 14mm). 2. When installing a new spark plug, always follow the instructions listed in the engine manufacturer's literature. When replacing spark plugs, BASIC IDENTIFICATION OF SPARK PLUG - is necessary for determination of the correct spark plug installation troque. If you are inspecting and replacing an existing plug, be sure to use a wire brush to clean any debris from the plug's threads. What is the torque setting for spark plugs? In the absence of this tool, the table below provides a generic guide to torquing a replacement plug based on the number of turns after the plug becomes finger-tight. Wouldn't use an impact wrench for sure. While it may not strip the threads it could certainly pull them a bit and eventually lead to stripped threads. I used a torque wrench set to 18 ft. lbs. If a torque wrench is unavailable, finger tighten the spark plug, then use a plug wrench to tighten. 1/12-1/8 turn on plugs with a tapered seat. Providing it's accurate, is there really a risk of over torquing? This ensures air tight connection which prevents spark flash-over (spark on the outside of the spark plug between the spark plug High Voltage terminal and the spark plug shell) which will cause spark plug missfire and engine hesitation. A spark plug that is under-torqued will not be fully seated in the cylinder head and heat dissipation will be slowed. A tapered-seat spark plug should be tightened by 1/16th of a turn past finger tight. If anti-seize compound is to be used, it should be applied sparingly because this could foul the plug and produce excessive carbon build-up on the threads, as well as give off fumes once the engine reaches operating temperature. Conical seat - Spark plug is sealed in cylinder head with a conical (tapered) seat. It is extremly important not to exceed the installation torque. It is extremly important not to exceed the installation torque. Correct torque is the very most critical step of spark plug installation. 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! But a torque wrench should be safe. It is 11 lbs ft. Or 132 lbs in. spark plug removal and installation tool, Musi Racing Opens 2020 Season With Victory At U.S. Street Nationals, BRISK USA SPARK PLUG CROSS REFERENCE TABLE. I believe NGK is now the recommended spark plug (by BMW), or, put another way, the ones that have the BMW name on them are NGKs. If you use anti-seize (which I recommend) you can torque them to slightly less than 13 ft/lbs because the lubrication decreases the friction and they tighten more easily. Install the coil pack and torque the bolts down to 64-95 in-lb (5.33-7.2 ft-lb). 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). Most car makers use aluminum alloys inside the cylinder heads of most cars, so it’s very important to tighten spark plugs to the correct torque. Torque is one of the most critical aspects of spark plug installation. To me, 15 ft/lbs is plenty tight for a spark plug in an aluminum head. How to Change Spark Plugs - Spark Plugs Methods of Sealing, Spark Plugs Installation and Spark Plug Gap Chart sections of this page are here to help you better understand the most critical steps and procedures in changing spark plugs. The first step required for proper torquing of a new replacement plug is to ensure you have clean thread surfaces. The proper torque of a spark plug can only be achieved using a torque wrench. too. The low torque spec in this case is to protect the threads in the head, it's not unusual for other engines with iron heads using NGK to have a 20+lb plug torque spec. Torque requirements vary greatly from engine to engine. spark plug torque specs Looks like 115 inch pounds and no lube or anti-seize is exactly what the manual says. Then a spark plug wrench should be used to tighten the spark plug by turning an additional angle as follow: IMPORTANT !!! Care must be taken when torquing spark plugs, especially in softer aluminum cylinder heads. Isn't a torque wrench the only way measure the ft. lbs. Spark plug and cylinder head threads needs to be free of carbon build up, clean, and it is recommended, free of lubricant. Most people on this forum are doing something like 10-14 ft lbs with NGK plugs… Methods of spark plugs sealing in the engine cylinder head: How to Change Spark Plugs - Replacing Spark Plugs using torque wrench, Development Trends Of Spark Plug Dimensions, Spark Plug Suppression Of Quenching Effect, Spark Plug Tightening Torque During Installation. A spark plug must be gapped correctly in order to leave enough room for the spark to ignite on the tip of the plug. 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. The factory has had different torque specs for indexing sparkplugs since 1996. 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. ITEM TORQUE SPECIFICATION (Foot-pounds / Newton-meters) Spark plugs: 11-17 (132-204 in-lbs) Engine oil drain plug (19mm) 22-30/31-41: Gearbox drain plug (24mm) THIS CROSS REFERENCE TABLE IS INFORMATIVE ONLY. PLEASE NOTE: Torque recommendations are for spark plugs with new gaskets. This according to both the Chilton manual and the owner's manual. 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. To gap spark plugs always use a spark plug gapping tool. Has Porsche put out a service bulletin on this? Without a Torque Wrench: If a torque wrench is unavailable, finger tighten the spark plug, then use a plug wrench to tighten. of torque. Install the new spark plug and torque it down to 15-21 ft-lb (180-252 in-lb). When replacing spark plugs, for proper spark plug installation it is always highly recommended to use spark plug removal and installation tool and spark plug torque wrench. Similarly, if the threads are of 18mm, consider setting 15 to 20 ft-lbs. The use of anti-seize or thread lubricants will modify these values unpredictably, so read the product instructions carefully before proceeding. This video is about Proper Torque - Spark Plugs By NGK:https://www.denniskirk.com/ngk For proper spark plug installation, it is always highly recommended to use spark plug removal and installation tool and spark plug torque wrench. And yes put alittle copper anti seize on the threads. Spark Plug Installation. Torque requirements vary greatly from engine to engine. 2021 Spark Plugs. Never pry the ground electrode with a screwdriver or similar object. Clean the outside of the coil tube with a damp rag. 180Marty thanked for this post 04-01-2017, 11:20 AM #2 If spark plug thread lubricant (antisieze) is used when replacing spark plugs, it shoud be used very sparingly on the spark plug thread only and the spark plug installation torque is to be reduced by about 25% ! It's really hard to stretch a plug shell or strip the threads at less than 10 lbs of torque. 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. In this case no sealing washer is used. However, it is highly recommended to use spark plug dielectric grease in the spark plug wire cable boot, or Coil on Plug boot prior connecting to the spark plug. For 14mm threads, the recommended torque setting is about 7 to 15 ft-lbs. I have always felt the factory goes a bit overboard on it's torque specs on certain things. Dielectric grease prevents missfires, keeps the moisture out, and ease the future removal of the spark plug wire or the spark plug boot. How to change conical (tapered) seat spark plug without torque wrench - (only if torque wrench can not be obtained). At 374K miles, this is my third set of plugs that I have installed and never had an issue before. does that seem ridiculously light? Feel free to download this catalog for any information reference of Brisk Spark Plugs. I've done snug but if you don't have a good feel for tools and properly tightening parts use a torque wrench. Thanks Getting conflicting info on the NGK spark plug torque spec. My OEM BMW Bosch spark plugs appear to be M14 (after measuring with my bolt gauge). I had to clean up the threads with a tap (same size) and luckily that worked fine. It's easy to mess up spark plug threads NOTE: Manufacturers' torque specifications always take precedence over the specifications shown in the table above.Exercise care when installing spark plugs as varying conditions such as temperature, threads, etc. For best high voltage insulation, to prevent arcing-over on the outside of the aluminum oxide insulator and to repel moisture, always apply a high quality silicone grease to the inside of the spark plug boot. 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. The torque leaving the diff is equal to both shafts but is less at the wheel with the longer shaft due to the twisting. 3. The torque is 18 ft. lbs. 3. Before re-installing each coil, check condition of coil o-ring and replace if necessary. This goes for conical seat spark plugs only! However, it is possible to tighten the plugs satisfactorily without a torque wrench. Especially as the plug has a tapered seat on it. 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. m) torque. Use the Champion torque recommendation below as a guide for tightening all spark plugs. NOTE: If you have high performance alloy or aluminum heads, always use a torque wrench to eliminate any possibility of damaging the engine's internal threads. Torque values assume clean, dry threads. 2010 Prius spec is 13 ft lbs. Bosch - 1/4 turn on plugs with a gasket. And while we're on the subject do you torque to 25, 30 or 35 ft. lbs on your Lycoming spark plugs. Spark plugs are constructed by using two different manners of sealing in cylinder head. The last thing you want to do is overtorque spark plugs in an aluminum head. 1/16 turn on plugs with a tapered seat. Using a spark plug socket and ratchet, turn new spark plugs (18mm and 14mm thread size) a half turn (180°) clockwise to tighten. 4. Step-by-Step Instructions Tapered Seat Plugs. This will help ensure proper seating and adequate … 08 ZX-14 manual says 115 inch-lbs for spark plug torque, so under 10 ft-lbs? for the size and thread style of plugs used in FICHT, DI, and E-TEC engines. That and some common sense should guide you. Anyway, I'd stick with the turns-past-contact method as specified on the plug box. Tighten new or reused gasket spark plugs as follows: Hand tighten the spark plug until it seats. If gasket style spark plug is installed without sealing gasket, the combustion area will not seal sufficiently and heat removal (transfer of heat from the spark plug into the engine cylinder head) will not be sufficient. The information provided below has been estimated for standard engines: In most engines, replacement plugs can be installed without using a torque wrench but extra care should be taken to ensure the new spark plug seats and seals properly. - When replacing spark plugs, the engine must be close to the ambient temperature. applied? Torque directly affects the ability of the spark plug firing end to dissipate heat to the cylinder head. NGK ZFR5F-11 (2622) spark plug with gasket. When in doubt, always check your engine manufacturer's literature. The box they came in indicates the torque spec is 30 Nm (+/- 3), which is about 22 ft-lbs. Install the new plug finger tight, and complete the installation with a torque wrench. If you overtighten spark plugs that have an aluminum cylinder head, it can cause the shell of the spark plug to distorts, which leaves you with a broken seal between the porcelain and metal components – leading to a combustion leak. Without a Torque Wrench: If a torque wrench is unavailable, finger tighten the spark plug, then use a plug wrench to tighten. The production line used to specify up to 30 ft.-lbs and that is where the higher torque … 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 . It is extremely important to never exceed the spark plug recommended installation torque. 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. See the illustration above. 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. Champion sparkplugs says 22 ft-lbs max. 1/16 turn on plugs with a tapered seat. Tighten used plugs 30°. can all have an effect on how much torque is required to seat the spark plug correctly. Since my understanding is that this torque spec is a "dry" spec, and I put a LIGHT coating of anti-seize on the threads, when I installed new plugs last December I torqued them to 19 ft-lbs to allow for this. Not sure how accurate it is. Wayne Dempsey's book gives 22 ft. lbs. Improper torquing can lead to damage. A copy of the FSM from 1998 also gives 22 + 2 ft. lbs. The proper torque of a spark plug can only be achieved using a torque wrench. Notes "spark plug applications are subject to change". On the box its saying Aluminum heads and spark plugs with gasket torque to 18-21 ft lbs. Care must be taken when torquing spark plugs, especially in softer aluminum cylinder heads. 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. The assembly of spark plug with this kind of sealing requires an especially sensitive approach. One of my old plugs was stripped, and so was the hole into which it threads. I know that my 2000 Camry calls for 13 ft/lbs torque for spark plugs. Note: If using a torque wrench vs. plug wrench, please refer to the Torque Recommendations chart below. How to change gasket (washer) style spark plug without torque wrench - (only if torque wrench can not be obtained). DUE TO DIFFERENCES IN DESIGN AND MATERIALS THE SPARK PLUGS OF VARIOUS MANUFACTURERS DO NOT HAVE EXACTLY THE SAME HEAT RANGE. I would never run a plug down to 16 Ft. Lbs in an aluminum head. The Bentley manual (page 3-30) gives spark plug torque as 22 + 2 ft. lbs. In this case sealing washer must be used (comes with new spark plugs). When replacing spark plugs without spark plug torque wrench, spark plugs should be thread-in by spark plug removal and installation tool, or socket by hand (wihtout spark plug wrench) untill they fully seat. When in doubt, always check your engine manufacturer's literature. If you do not have a torque wrench install plugs snug and then turn 1/4 turn. Step One. Per Auto Zone repair guide: Non-hybrid 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. For a brand new head, 22 ft/lbs may work ok, but after that, I'd prefer to tone it down a little bit. 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