Add a teaspoon of engine oil to the cylinder and take another compression reading. Look it up if you have a specialized motor, but the 100 PSI mark is a good indicator.Īfter you do this, you can further diagnose the problem pretty easily. Some models will read higher, but none will be reading lower. Your PSI should read at over one hundred in each of the cylinders if your engine is healthy. A piece of chalk will let you easily write on most engines. It’s recommended to mark each cylinder’s pressure down as you go so that you can diagnose the problem afterwards.
If you don’t have a constant PSI reading at this point you can allow the engine to crank up to ten times, but remember to keep doing it with all of the cylinders so you have equal readings. This will achieve compression and allow you to make sure that you have the proper reading. Make sure you do the latter, as you only want to test the compression and not dump fuel into the engine itself, without the spark plugs it’s not going to ignite.Īfter you do this crank the engine four or five times. Using one is simple, pretty much anyone who knows their way around a tool box should be able to do it.īegin by removing the spark plugs from your engine and setting them to the side, then disconnect the fuel pump. Most people will instinctively look them dead on, but it’s important to keep track of as the variance in your readings can be quite large from seemingly small angles. With any analogue gauge, parallax will occur when you aren’t looking dead on at the gauge, causing the reading to seem higher or lower depending on the angle of viewing. When you’re using an analogue gauge and trying to get accurate measurements, there’s one main thing to look out for which is parallax. The simple usage and easy to read meter make it a superior tester for almost any application.
#COMPRESSION TESTER FOR SMALL ENGINES FULL#
We do recommend the Mityvac ( see full specs) for nearly anyone. If you have a shop, or if you’re even the type of guy that everyone comes to when there’s automotive trouble afoot, then one of the test kits which can handle a wide range of different plugs but if it’s just your car then you can get away with a cheaper option. Which one of the above options you decide to go with will largely depend on your uses. The price reflects it, but you’re simply not going to be able to do any better.
There’s a ton of hoses and different adapters, it’s durable, and it’s extremely simple to use at the end of the day. The digital meter is extremely accurate and the kit comes with everything necessary to hit the plugs in nearly any gasoline motor that you can bring it to. The Mityvac MV5532 is pretty much the best compression tester you’re going to find.
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