Before you get to work installing new plugs, make sure to educate customers on the importance of premium options. Gapping is one of the last steps in getting customers set up with the ideal ignition products for their needs. This should be the only gapping tool used in your shop, especially when it comes to iridium finewire spark plugs. With a selection of wire loops and a hook, this gauge helps in measuring the gap, gently bending the electrode and then re-measuring until correct. The right tool must be more delicate.Ī wire loop gauge is the preferred gapping tool because of its combination of accuracy and damage-free operation when used properly. Specifically, this gauge could break off the electrode or cause damage to iridium-enhanced or true iridium finewire. Long ago, this was the standard tool for the job, but it has been surpassed due to its potential for damage. The original ramp-style gauge was inserted in-between the center and ground electrodes, spun along its angled surface to the proper gap and then pulled out. The gauges used for gapping have also evolved. A combination of a steady hand and a trusty gapping tool is needed to take on this task.įortunately, spark plug metallurgy is not the only engineering advancement in automotive ignition. Even though they can potentially deliver more than 100,000 miles of ignition, 0.6mm or 0.5mm iridium finewire can be destroyed during gapping. This is especially true of iridium plugs. Too large and the voltage required from the coil may be too great.īecause spark plugs are precision-made products, any adjustment has the potential to greatly affect performance. Too small of a gap and the flame kernel may not have enough room to expand. Without the right gap, the plug may not be able to ignite the air-fuel mixture or create the necessary combustion to start an engine. One of the main reasons to take extra care in this area is that spark plug gaps are a delicate balance, with proper distances coming down to a tenth of a millimeter or four thousandths of an inch. This gap, or the proper distance between the center and ground electrodes, can be found in each vehicle’s service manual. ACDelco recommends you begin adjusting your stocking requirements for theĤ1-962 in preparation of the upcoming catalog updates.Anyone installing new spark plugs needs to be mindful of the right gap for successful ignition and optimal performance. Catalog changes for the Epicor and WHI systems will be updated in the June Both plugs meet original equipment specifications for the applicationsĭesignated. 2007 and newerĪpplications used iridium plugs in production and service requirements will remain assigned to Older model years, GM used a double platinum spark plug in production, and these olderĪpplications are to be serviced with the double platinum plug 41-962. Subject: ACDelco Spark Plugs 41-110 and 41-962 - Application UpdateĪCDelco announces that 2006 and older, as well as some 2007, spark plug service applicationsĬovered by the iridium spark plug 41-110 have moved to the platinum plug 41-962. To: DDG Headquarters and Branches Category: Productįrom: Brad Brunken, Product Development Line(s): 41 WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION ![]() See your GM dealer for information on whether your vehicle may benefit from the information. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. ![]() Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". Any new spark plug found to not be properly gapped should not be used. The spark plug gap is set during manufacturing and should not be changed or damage to the spark plug may result. The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01mm (0.040 inches) when the spark plug is made. Due to the different tip design, the gap of the spark plug has also changed. The new spark plug has an Iridium tip instead of the current Platinum tip. With 4.8L, 5.3L, 5.7L or 6.0L V-8 Engine (VINs V, P, T, Z, G, S, N, U - RPOs LR4, LM4, LM7, L59, LS1, LS6, LQ9, LQ4)Ī new spark plug has been released for use in the above vehicles. ![]() Subject: Information on New Spark Plugs and Gapping #03-06-04-060 - ()Ģ002-2004 Cadillac Escalade, Escalade EXTĢ001-2004 GMC Yukon Denali, Yukon XL Denali
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