{"product_id":"ngk-2238-tr5-spark-plug-surface-discharge-copper-core-14mm-thread-resistor","title":"NGK 2238 TR5 Spark Plug, Surface Discharge, Copper Core, 14mm Thread, Resistor","description":"\u003cp\u003eThe NGK 2238 (TR5) is a standard spark plug built on proven NGK technology for reliable, consistent ignition performance. It uses a surface discharge ground configuration paired with a solid copper core center electrode, delivering superior heat dissipation, strong conductivity, and a broad heat range for stable combustion. The ground electrode core and center electrode tip are both nickel, a durable, corrosion-resistant construction that has served as an OE cornerstone for decades of dependable use. The plug body is treated with corrosion-resistant plating, which keeps threads from seizing and makes installation and removal straightforward even after extended service.\u003c\/p\u003e\u003cp\u003eThe NGK 2238 features a 14mm thread with a tapered seat design and a resistor-type build (5k Ohm resistance) to help suppress ignition noise. It is intended as a direct replacement for the original equipment plug it matches in a spark plug service or tune-up, and is commonly used in Mercury outboard engine applications. Always confirm the correct spark plug against your engine and maintenance manual, and use only as recommended by your engine's original equipment manufacturer, since installing the wrong plug can reduce performance, hurt fuel economy, or damage the engine.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e NGK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 2238\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpark Plug Type:\u003c\/strong\u003e Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround Configuration:\u003c\/strong\u003e Surface Discharge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround Electrode Core Material:\u003c\/strong\u003e Nickel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter Electrode Core Material:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter Electrode Tip Material:\u003c\/strong\u003e Nickel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance:\u003c\/strong\u003e 5k Ohm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 14mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeat Type:\u003c\/strong\u003e Tapered Seat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReach:\u003c\/strong\u003e 0.708 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 3.98 inches L x 0.91 inches W x 0.86 inches H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 087295122389\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eCommonly used in Mercury outboard engine spark plug applications. Always check your engine and maintenance manual to confirm this is the correct spark plug for your specific engine before ordering.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat type of spark plug is the NGK 2238?\u003c\/strong\u003e The NGK 2238 (TR5) is a standard resistor-type spark plug with a surface discharge ground configuration and a solid copper core center electrode, designed for reliable, consistent ignition performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the thread size and seat type of the NGK 2238 spark plug?\u003c\/strong\u003e It has a 14mm thread with a tapered seat design, and a reach of 0.708 inch.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat materials are used in the NGK 2238 spark plug?\u003c\/strong\u003e The ground electrode core and center electrode tip are nickel, while the center electrode core is copper, giving the plug strong heat dissipation and conductivity.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the NGK 2238 a resistor spark plug?\u003c\/strong\u003e Yes, the NGK 2238 has a resistance rating of 5k Ohm, which helps suppress ignition noise.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the NGK 2238 spark plug weigh?\u003c\/strong\u003e The NGK 2238 spark plug weighs 0.15 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines is the NGK 2238 spark plug used in?\u003c\/strong\u003e The NGK 2238 is commonly used in Mercury outboard engine spark plug applications; always check your engine and maintenance manual to confirm it is the correct plug for your specific engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the NGK 2238 have corrosion-resistant plating?\u003c\/strong\u003e Yes, the NGK 2238 is treated with corrosion-resistant plating, which makes installation and removal easier even after extended use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the NGK 2238 and NGK's iridium spark plugs?\u003c\/strong\u003e The NGK 2238 (TR5) is a standard copper-core plug, while NGK also offers iridium versions with a fine-wire iridium center electrode tip for improved starting, idling, and throttle response; those are separate NGK part numbers from the 2238.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the package size of the NGK 2238 spark plug?\u003c\/strong\u003e The NGK 2238 ships in a package measuring 3.98 inches long by 0.91 inches wide by 0.86 inches high.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat ground configuration does the NGK 2238 spark plug use?\u003c\/strong\u003e The NGK 2238 uses a surface discharge ground configuration, part of NGK's standard spark plug design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the NGK 2238 is the right spark plug for my engine?\u003c\/strong\u003e Check your engine and maintenance manual for the correct spark plug specification, and only use the NGK 2238 as recommended by your engine's original equipment manufacturer, since an incorrect plug can reduce performance or damage the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the NGK 2238 spark plug genuine NGK or aftermarket?\u003c\/strong\u003e The NGK 2238 is a genuine NGK standard spark plug, part of NGK's OE-grade spark plug lineup.\u003c\/p\u003e","brand":"NGK Spark Plugs","offers":[{"title":"Default Title","offer_id":49028254892251,"sku":"NGK-TR5","price":3.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/NGK-TR5__28531.1722510527.500.750.jpg?v=1785165243","url":"https:\/\/www.goodvibesmarina.com\/products\/ngk-2238-tr5-spark-plug-surface-discharge-copper-core-14mm-thread-resistor","provider":"Good Vibes Marina","version":"1.0","type":"link"}