![]() The Shrader valve in the adapter traps the compression in the gauge so you can do the compression test without an assistant. The adapter has a built in Schrader valve to trap pressure and a special gauge to show the compression readings. You will need a notepad to jot down your readings and label each cylinder appropriately on your notes.Ī compression tester can be purchased or rented and includes a set of adapters that will screw into the spark plug hole. ![]() You will also need a good quality ratchet, an extension or two (a long one with a “wiggle joint” is a good idea on V6 or V8 engines), and a suitable spark plug socket – note that while a regular socket may fit, it’s best to use an actual spark plug socket designed to remove spark plugs. Keep in mind if working around a hot engine to be careful of hot engine parts like the exhaust manifolds. Gather your tools, including insulated gloves (or nitrile) and safety goggles to protect yourself from hot parts and oil sprays. If you measure the tire pressure of 4 tires on your car, and the measurement of three of them is 32PSI, but one of them is 15PSI, you immediately know you have an issue with that one tire, and further testing or inspection is needed to determine why. Understanding a compression test procedure is also understanding what you are trying to achieve, and that is consistency between the numbers of each cylinder, and looking for the outlier, or outliers. ![]() From a single piston lawn mower engine, to a diesel or V8 engine, the process is entirely the same – measure what the cylinder is producing in PSI. The premise of a compression test is to test each cylinder to see in measured PSI exactly how much compression that particular cylinder is producing. A compression test is by far one of the most basic engine test procedures and starting point to understand exactly what your engine is doing, and where the problem may be. From a misfire to a massive reduction in power, there are some severe and complicated problems that can arise. If your engine loses compression on one or multiple cylinders, problems will follow.
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