{"product_id":"gnhydxfe-tu-21-engine-cylinder-leak-down-tester-kit-dual-gauge-compression-tester-red-regulator-adapters","title":"Gnhydxfe TU-21 Engine Cylinder Leak Down Tester Kit — Dual-Gauge Compression Tester, Red, Regulator \u0026 Adapters","description":"\u003cstrong\u003eThe Gnhydxfe TU-21 Engine Cylinder Leak Down Tester Kit is a dual-gauge diagnostic set that connects to an air compressor to identify cylinder leakage paths like worn rings, valves, cracks, or head gasket failures.\u003c\/strong\u003e\n\n\u003cp\u003eThis compact kit gives technicians and DIY mechanics a fast, reliable way to evaluate an engine's sealing condition without removing many components. Equipped with a two-scale gauge, pressure regulator and a selection of adapters and hoses, the TU-21 works with most petrol engines that accept spark plugs. It’s designed for straightforward setup, visible readings, and flexible connection options so you can pinpoint where compressed air escapes during service checks.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I set up the TU-21 kit for a leak down test?\u003c\/h3\u003e\n\u003cp\u003eSetup is simple: plug the manifold into your air hose, screw or push the appropriate adapter into the spark plug well, and adjust regulator pressure on the manifold. Remove ignition and fuel as required by your vehicle’s safety procedures before pressurizing the cylinder to test leakage.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAttach 18\" hose to compressor and manifold assembly.\u003c\/li\u003e\n  \u003cli\u003eSelect threaded or push-on connector matching the spark plug bore.\u003c\/li\u003e\n  \u003cli\u003eUse the regulator knob to set test pressure, then read dual gauges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat readings will the dual gauges provide and what do they mean?\u003c\/h3\u003e\n\u003cp\u003eThe TU-21 displays both absolute test pressure (0–100 psi \/ 0–7 bar) and percentage leak rate (0–100%). Together they show how much pressure you’re supplying and how much is escaping, making it easier to compare cylinders and locate problems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLeft gauge: supply pressure in psi\/bar for test consistency.\u003c\/li\u003e\n  \u003cli\u003eRight gauge: leak percentage to evaluate cylinder sealing performance.\u003c\/li\u003e\n  \u003cli\u003eAccuracy approximately 0.5% for repeatable comparisons across tests.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich leak paths can this tool help identify?\u003c\/h3\u003e\n\u003cp\u003eBy pressurizing one cylinder at a time, you can detect where air is escaping — for example past piston rings into the crankcase, through intake\/exhaust valves, or into the cooling system via a head gasket. Listening, observing oil\/fumes, and using the kit’s readings together improve diagnosis speed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRing sealing issues: hissing from oil fill or crankcase vents.\u003c\/li\u003e\n  \u003cli\u003eValve leaks: air audible at intake or exhaust ports.\u003c\/li\u003e\n  \u003cli\u003eHead gasket or crack: air bubbles in coolant or exhaust smoke.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat accessories are included and how do they expand compatibility?\u003c\/h3\u003e\n\u003cp\u003eThe package bundles a double-gauge manifold, multiple metal adapters, push-on connectors, an extension rod, and an extra hose so you can reach a variety of engine layouts. This assortment reduces the need for additional purchases and adapts to shallow or deep spark plug wells.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTwo metal threaded adapters and push-on connectors for most petrol engines.\u003c\/li\u003e\n  \u003cli\u003eM14 aluminum extension rod and extra hose for hard-to-reach plugs.\u003c\/li\u003e\n  \u003cli\u003eAR2000 pressure regulator and American quick-connect fitting for easy compressor hookup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The Gnhydxfe TU-21 is aimed at home mechanics, mobile technicians, and small garages that need an affordable, portable diagnostic tool for routine engine evaluation. If you perform cylinder health checks, compare multiple cylinders, or troubleshoot suspected ring, valve, or head gasket damage, this kit provides clear, repeatable results without expensive shop equipment. It’s ideal for gasoline engines with spark plugs up to approximately 20 mm bore size and for anyone who prefers visual, gauge-based diagnostics over guesswork.\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 I use this kit with my air compressor?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—connect the TU-21 to a standard air compressor via the included quick-connect; set regulated pressure before testing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will it work on deep spark plug wells?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—the kit includes an M14 extension rod and extra hose to reach shallow and deep spark plug locations.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Gnhydxfe","offers":[{"title":"Default Title","offer_id":48086157099166,"sku":"B0DF6417DJ","price":48.32,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/gnhydxfe-tu-21-kit-layout.jpg?v=1785887345","url":"https:\/\/northtrailauto.ca\/products\/gnhydxfe-tu-21-engine-cylinder-leak-down-tester-kit-dual-gauge-compression-tester-red-regulator-adapters","provider":"North Trail Auto","version":"1.0","type":"link"}