How to replace spark plugs and spark plug wires for different engine types on GMC C3500?

For removing spark plugs, disconnect the Spark Plug Wires; choose the Spark Plug wire harness replacement (5.0L-5.7L) for spark plugs and Spark Plug wire harness replacement (7.4L) for those with a 7.4l engine. Loose the spark plugs a few turns because they work best when removed from the wells. Brush off dirt from around the spark plugs and afterward, take the spark plugs out one by one, putting them into a tray matching their cylinder numbers. While installing, fit every Spark Plug washer in the right place and check the gap of the Spark Plug, changing it to match the correct specification which is 1.524 mm (0.060 in). For tightening the bolts, use 15 n.m (11 lb ft) for iron head installations of 4.3l, 5.0l and 5.7l, 20 n.m (15 lb ft) for iron head installations of 7.4l and 30 n.m (22 lb ft) for iron heads newer than those offered in 4.3l, 5.0l, 5.7l and 7.4l. After finishing the rebuild, put the Spark Plug Wires back and use the Spark Plug wire harness replacement (5.0L, 5.7L) for 5.0/5.7l models and the Spark Plug wire harness replacement (7.4L) for 7.4l engines.

OEM GMC C3500 Spark Plug

Ignition Spark Plug

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GMC C3500 Glow Plug Part Number: 12563554
$18.86 MSRP: $33.68
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Product Specifications
- Other Name: Glow Plug, Spark Ignition; Diesel Glow Plug
- Replaces: 25168651
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1988-2000 GMC C3500 | Sierra, Sierra SL, Sierra SLE, Sierra SLT, Sierra SLX | 8 Cyl 5.7 L CNG, 8 Cyl 5.7 L GAS, 8 Cyl 6.2 L DIESEL, 8 Cyl 6.5 L DIESEL, 8 Cyl 7.4 L GAS

GMC C3500 Spark Plug

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An edifice that transforms the performance and durability of GMC C3500 cars is the Spark Plug. Located in the combustion chamber of the motor vehicle's engine, the primary purpose of the Spark Plug is to ignite the air/fuel mixture, vital for efficiency and safety of the engine. It comes in copper and nickel types, platinum, and iridium; the Spark Plug is designed to fit with the ignition system and the type of engine found in the models of the truck. The Spark Plug of the GMC C3500 requires maintenance occasionally, plus replacements in some instances; some of the problems that may be realized include misfire and poor fuel consumption efficiency, putting the life span of the truck at risk. This Spark Plug can be used in different C3500 models, thus implying that different drivers can always be sure of the performance irrespective of the standard or the crew chassis cabs that was featured in the 1991 models. The specific heat range with the desired thread size on the product also makes it popular in the GMC C3500 automotive market for efficiency and durability. Apart from the improvement of the output power of the GMC C3500, the Spark Plug helps in the combustion efficiency hence improving the fuel consumption thus should be a major concern for any owner. Therefore, it is evident that Spark Plug is one of the best quality and compatible, which strengthened GMC C3500 reputation out of light and medium duty truck lovers.

GMC C3500 Spark Plug Parts and Q&A

Glow Plug
12563554
Q: How to replace spark plugs and spark plug wires for different engine types on GMC C3500?
A:
For removing spark plugs, disconnect the Spark Plug Wires; choose the Spark Plug wire harness replacement (5.0L-5.7L) for spark plugs and Spark Plug wire harness replacement (7.4L) for those with a 7.4l engine. Loose the spark plugs a few turns because they work best when removed from the wells. Brush off dirt from around the spark plugs and afterward, take the spark plugs out one by one, putting them into a tray matching their cylinder numbers. While installing, fit every Spark Plug washer in the right place and check the gap of the Spark Plug, changing it to match the correct specification which is 1.524 mm (0.060 in). For tightening the bolts, use 15 n.m (11 lb ft) for iron head installations of 4.3l, 5.0l and 5.7l, 20 n.m (15 lb ft) for iron head installations of 7.4l and 30 n.m (22 lb ft) for iron heads newer than those offered in 4.3l, 5.0l, 5.7l and 7.4l. After finishing the rebuild, put the Spark Plug Wires back and use the Spark Plug wire harness replacement (5.0L, 5.7L) for 5.0/5.7l models and the Spark Plug wire harness replacement (7.4L) for 7.4l engines.