Cylinder Leak Down Tester,Compression Test kit -Engine Cylinder Dual Gauge Leakdown Tester kit Diagnostics Tool.

Product Information

The readings are taken from the second gauge, the first gauge which you use for zeroing will be lower as well. Note that some testers, including our Longacre Dual Gauge Leak-Down Tester, actually show the amount of leakage on the second gauge, eliminating the math. The gauge on the right is held at a standard pressure by adjusting the pressure regulator while the gauge on the left shows an example reading of 85, or 15% leakage. Leakage is given in wholly arbitrary percentages but these “percentages” do not relate to any actual quantity or real dimension.

Keep in mind that when a fitting size is listed, you should have your vehicle specifications handy and check compatibility before purchasing. If air escapes into the crankcase during this test but not with the piston at TDC, you're likely looking at a cracked or badly scored cylinder wall. This kit is rated to handle a maximum of 300 PSI, and is suitable for all gas motors in automobiles, motorcycles, and even marine equipment. You can watch the leakage "rate" increase as the feed pressure drops below 110 psi on the gauge on your compressor. If you are on the hunt for a leak down tester, chances are you have a serious engine problem or are trying to isolate one.

Gauge meter faces can be numbered 0-100 or 100-0, indicating either 0% at full pressure or 100% at full pressure. A locomotive engine which gives a leak-down of 10% on a leak-down tester is virtually perfectly sealed while the same tester giving a 10% reading on a model airplane engine indicates a catastrophic leak. You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice.

Tip: Insert a long screwdriver or extension into the spark plug hole and turn the engine by hand with a socket on the crankshaft. This Wiki includes options for daily, rigorous professional use like the OTC 5609, as well as others for the odd job at home in your garage like the Faersi Cylinder Leak Detector. Since the compression tester relies on the engine cranking, several uncontrolled variables are introduced which can make the results less useful.The exact test pressure tolerated before rotation is highly dependent on connecting rod angle, bore, compression of other cylinders, and friction. A weak battery, a corroded starter cable, or a hot starter can all cause the engine to crank slower, which can affect the test results. If you're trying to decide whether or not to condemn an engine, the last thing you want to settle on is the quality of your leak down tester.