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