Connect the compression gauge to the opposite end of the hose. Put the compression test adapter into the engines first cylinder.
How To Compression Test Your Engine Diy
How to make a compression tester. A threaded coupling is screwed into a spark plug hole. It seems to work pretty good. Using a few air fittings i made an adapter to convert a compression tester into a cylinder leak down tester. All engines leak somewhat so even on a healthy engine the gauge will drop down to 90 psi 10 leakage or so. If the hose does not fit check the hardware store for a. How to make a compression test gauge.
Make sure the cylinder is at tdc of the compression stroke so all the valves are closed and attach the leakdown tester to the cylinder head. First of all connect the tester to a cylinder and turn the engine over 6 to 8 compression strokes. Take the compression gauge and screw it onto one end of the hydraulic hose. If it drops a large amount then you have a leak from chipped valves or a bad headgasket etc. Take an old spark plug to the hardware store and locate a male coupling that is the same size as the spark. If youre testing a diesel engine make sure youre.
Note how fast the compression increases and write down the highest reading. How to make a pressure test fitting from a spark plug for compression testing or leak down testing. Crank the engine at least 4 times to. Performing the test 1. Look down on the engine to figure out which. You will be able to hear the cranking speed slow.
Most people start with cylinder number one and follow the engines firing order. As the tested cylinder comes up on its compression stroke. Compression tester turned leak down tester duration. Thanks everyone for watching. The crankshaft is then turned so that each piston is at top dead centre. Compressed air 80 to 90 psi is then fed into the cylinder.
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