This method requires very precise measurements so its important to have very accurate tools a clean engine and to double or triple check your work. Then retest the cylinder.
How To Check The Compression Of An Engine
How to test compression. Turn off the ignition or ground the spark plugs. To determine whether pressure is escaping from the engine you need to check the compression in the cylinders with a compression gauge which measures the amount of pressure that the piston exerts on the fuelair mixture before the spark plug fires the mixture. The only efficient and accurate way to test for compression is with a compression gauge which resembles a tire gauge. So you squirt the tablespoon of engine oil into a cylinder that is reading low. Method 1 of 2. 40 psi or more.
Put the compression test adapter into the engines first cylinder. To install it pull back the collar at the end of the gauge and slide it over the metal end of the tube. The gauge displays engine compression. Crank the engine two revolutions or so to spread the oil. These gauges dont cost much and theyre easy to use. Performing the test 1.
Disconnect the main wire to the coil and spark plug. Adding oil to spark plug hole for wet compression test. If youre testing a diesel engine make sure youre. The trouble is poor ring to bore sealing. Step 1 remove the fuel pump and fuel injection fuses. Insert the pressure gauge hose fitting into the spark plug hole of the cylinder you want to test first.
Step 1 unscrew and remove the cylinder cover with the screwdriver if its present on your small engine to gain access to the spark plug. Measure the compression ratio manually. Look down on the engine to figure out which. Remove all of the spark plugs. With a compression tester a few hand tools and 20 minutes you can try this yourself. Connect the compression gauge to the opposite end of the hose.
If the compression comes up markedly. To run a compression test on your motorcycle engine. Crank the engine at least 4 times to. With the testing tube firmly seated on the silver adapter youre ready to attach the test gauge. Give it a tug to be sure that its on.
Gallery of How To Test Compression
