{"product_id":"gdlin-cylinder-leak-down-tester-kit-with-m14-extension-rod-dual-gauge-pressure-leakage","title":"GDLIN Cylinder Leak Down Tester Kit with M14 Extension Rod — Dual‑Gauge Pressure \u0026 Leakage","description":"\u003cp\u003e\u003cstrong\u003eGDLIN's Cylinder Leak Down Tester Kit is a dual-gauge compression and leakage testing set with extension rod and adapters designed to find piston, valve, head gasket and cylinder issues in gasoline engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact kit gives home mechanics and professional technicians a reliable way to pressurize a single cylinder through the spark plug hole and read both pressure and leakage percentage. It connects to a user-supplied air compressor and includes a regulated manifold, hoses, quick-connect fittings and an M14 extension rod so you can reach tight spark plug wells on cars, trucks and motorcycles.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the dual-gauge system show leakage and pressure?\u003c\/h3\u003e\n\u003cp\u003eThe kit uses two clear analog dials: one measures pressure (0–100 psi \/ 0–7 bar) and the other shows leakage rate as a percentage (0–100%). Readings let you quantify how much air is escaping from the tested cylinder and help isolate the fault. Gauges are calibrated to ±0.5% for repeatable results when used with a steady compressor supply.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePressure gauge range: 0–100 psi (0–7 bar)\u003c\/li\u003e\n  \u003cli\u003eLeakage percentage dial: 0–100% for direct comparison\u003c\/li\u003e\n  \u003cli\u003eAccuracy approximately ±0.5% for consistent readings\u003c\/li\u003e\n  \u003cli\u003eAnalog display for quick on-vehicle checks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat fittings and accessories come with the tester?\u003c\/h3\u003e\n\u003cp\u003eThe kit ships with a dual-head manifold, an 18-inch regulator-equipped hose assembly, multiple adapters and connectors to fit most gasoline engines. Included are universal push-in quick connectors plus threaded adapters that allow both non-threaded and threaded spark plug openings to be tested. An aluminum M14 extension rod and an additional extension hose expand reach for recessed plugs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDual-head manifold and AR2000 style regulator\u003c\/li\u003e\n  \u003cli\u003e18-inch hose with quick-connect air nozzle\u003c\/li\u003e\n  \u003cli\u003e2 metal threaded adapters and 2 universal push-in connectors\u003c\/li\u003e\n  \u003cli\u003eM14 aluminum extension rod plus long and short hoses\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I use the tester safely and accurately?\u003c\/h3\u003e\n\u003cp\u003eStart with the engine at TDC on the compression stroke and remove the spark plug. Connect the proper adapter, attach the test hose to your compressor, and bring the regulated pressure up slowly. Observe both gauges once pressure stabilizes; listen for obvious air escape to locate leaks. Never test on running engines and always follow basic shop safety with eye protection and proper ventilation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSet piston at top dead center (TDC) for the tested cylinder\u003c\/li\u003e\n  \u003cli\u003eRegulate compressor to the required test pressure before connecting\u003c\/li\u003e\n  \u003cli\u003eUse extension rod and hoses to reach recessed plugs cleanly\u003c\/li\u003e\n  \u003cli\u003eInspect for audible leaks at valve, gasket, and crankcase vents\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich engines and spark plug holes are compatible?\u003c\/h3\u003e\n\u003cp\u003eThis leak down tester is built for gasoline engines whose spark plug hole diameters are up to 20 mm and supports typical passenger cars, light trucks and motorcycles. The mix of push-in and threaded fittings plus the extension rod covers most modern and older engines. It is not intended for diesel engines that require different test pressures and connectors.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for gasoline engines with spark plug holes ≤20 mm\u003c\/li\u003e\n  \u003cli\u003eCompatibility: cars, light trucks, ATVs, motorcycles\u003c\/li\u003e\n  \u003cli\u003eNot intended for diesel cylinder testing\u003c\/li\u003e\n  \u003cli\u003eExtension rod and long hose for deep-plug access\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The GDLIN Cylinder Leak Down Tester Kit suits DIY enthusiasts, mobile mechanics and shop technicians who need a portable, accurate way to check cylinder sealing issues without removing heads. If you work on gasoline engines regularly and want a single kit that covers threaded and non-threaded spark plug holes with extension reach, this set offers the fittings, regulator and dual gauges to perform routine diagnostic leak-down checks and help prioritize repairs.\u003c\/p\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: Can this tester measure both pressure and leakage?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it has two analog gauges: one for pressure (0–100 psi) and one for leakage percentage (0–100%).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will it fit recessed spark plug holes?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the M14 extension rod and long hose reach recessed plugs on most gasoline engines.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GDLIN","offers":[{"title":"Default Title","offer_id":48082894258334,"sku":"B0GSYQNXCD","price":60.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/gdlin-front-view-kit.jpg?v=1785818583","url":"https:\/\/northtrailauto.ca\/products\/gdlin-cylinder-leak-down-tester-kit-with-m14-extension-rod-dual-gauge-pressure-leakage","provider":"North Trail Auto","version":"1.0","type":"link"}