{"product_id":"hromee-engine-air-valve-holder-cylinder-leakage-tester-m12-m14-for-gm-ls1-ls3-ls6","title":"Hromee Engine Air Valve Holder \u0026 Cylinder Leakage Tester – M12\/M14 for GM LS1\/LS3\/LS6","description":"\u003cdiv\u003e\n  \u003ch2\u003eOverview\u003c\/h2\u003e\n  \u003cp\u003eThe Hromee Engine Air Valve Holder and Cylinder Leakage Testing Assistant is a precision tool designed for gasoline engines that use M12 or M14 spark plugs. It helps you pressurize the cylinder to hold valves closed during oil seal replacement, so you can work more efficiently without a full engine teardown. When the tool sits in the compression stroke, you can listen for air leakage to identify potential issues and plan maintenance with greater confidence.\u003c\/p\u003e\n  \u003cp\u003eThis accessory suits GM Chevy LS family engines (LS1, LS3, LS6) and similar gasoline applications. You must remove the spark plug before installation. Not intended for diesel engines.\u003c\/p\u003e\n  \u003ch3\u003eHow it works\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eAttach the tool to a spark plug position using M12 or M14 threads.\u003c\/li\u003e\n    \u003cli\u003eConnect to an air source and pressurize the cylinder within a controlled range.\u003c\/li\u003e\n    \u003cli\u003eListen for leaks to locate affected parts without dismantling the engine.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003ch3\u003eKey features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDurable rubber tube and brass fittings resist wear, corrosion, and abrasion while delivering stable connections.\u003c\/li\u003e\n    \u003cli\u003e300 psi \/ 20 bar pressure tolerance helps maintain a seal and avoids accidental drops of parts into the combustion chamber.\u003c\/li\u003e\n    \u003cli\u003eIncludes a 1\/4\" NPT air quick coupler for fast, convenient setup.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003ch3\u003eTechnical notes and compatibility\u003c\/h3\u003e\n  \u003cp\u003eWorking pressure range: 30 psi to 110 psi (2 bar to 8 bar). The tool is designed for gasoline engines such as cars, trucks, boats, motorcycles, and ATVs. It should not be used on diesel engines.\u003c\/p\u003e\n  \u003ch3\u003eBenefits in everyday use\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003ePotential time savings by reducing the need for full disassembly when resealing valves.\u003c\/li\u003e\n    \u003cli\u003eClear, audible indications of leakage paths help you plan targeted maintenance.\u003c\/li\u003e\n    \u003cli\u003eCompatibility with common GM Chevy LS1\/LS3\/LS6 engines supports hobbyists and pros alike.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eWith thoughtful design and robust materials, this tool aims to support careful, informed maintenance decisions. While it suggests useful outcomes, results may vary by engine condition and usage context.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What engines and plugs does the toolkit support?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Designed for gasoline engines with M12 or M14 spark plugs; not suitable for diesel engines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How do I use the tool for valve testing?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Remove the spark plug, attach the tool, connect to air, pressurize (30–110 psi), and listen for leaks to guide maintenance.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Hromee","offers":[{"title":"Default Title","offer_id":42465753759829,"sku":"B0CQLXV7LS","price":30.06,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/hromee-engine-air-valve-holder-spark-plug-area.jpg?v=1778021340","url":"https:\/\/plentytorque.co.uk\/products\/hromee-engine-air-valve-holder-cylinder-leakage-tester-m12-m14-for-gm-ls1-ls3-ls6","provider":"PlentyTorque","version":"1.0","type":"link"}