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.
Diy Build Your Own Computer Based Compression Tester For 68
How to make a compression tester. Most people start with cylinder number one and follow the engines firing order. Thanks everyone for watching. If it drops a large amount then you have a leak from chipped valves or a bad headgasket etc. Performing the test 1. Connect the compression gauge to the opposite end of the hose. As the tested cylinder comes up on its compression stroke.
Compressed air 80 to 90 psi is then fed into the cylinder. The crankshaft is then turned so that each piston is at top dead centre. 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. Put the compression test adapter into the engines first cylinder. A threaded coupling is screwed into a spark plug hole.
It seems to work pretty good. First of all connect the tester to a cylinder and turn the engine over 6 to 8 compression strokes. Compression tester turned leak down tester duration. How to make a pressure test fitting from a spark plug for compression testing or leak down testing. If youre testing a diesel engine make sure youre. Take the compression gauge and screw it onto one end of the hydraulic hose.
Crank the engine at least 4 times to. You will be able to hear the cranking speed slow. 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. Note how fast the compression increases and write down the highest reading. How to make a compression test gauge. Take an old spark plug to the hardware store and locate a male coupling that is the same size as the spark.
Gallery of How To Make A Compression Tester
