Once the piston is at tdc of the compression stroke air pressure is introduced through a cylinder leak down gauge. Always make sure to test cylinder leakage with the piston at the top of the cylinder.
Cylinder Leak Down Test With Cold Motor What Are Acceptable
How to do a cylinder leak down test. Hook up the tester. One of the gauges on the tester shows the pressure at which the cylinder is being pressurized. Locate top dead center. The crankshaft is then turned so that each piston is at top dead centre. Honda civic diagnosis part ii cylinder leak down test duration. Be careful when introducing air pressure into the cylinder the piston can suddenly travel downward.
Remove the spark plug and place the problem cylinder at tdc top dead center of the compression stroke. A cylinder leak down test requires the removal of all the spark plugs. Unlike a compression test a leak down tester has two gauges and requires a compressed air source. The resistance from the other spark plugs helps resist this downward movement. Like a compression test a leak down test is accomplished by replacing a spark plug with the tester hose. It does little good to measure leakage with the piston at.
Remove the spark plug on that cylinder only. An engine leakdown test is a compression test in reverse. Compressed air 80 to 90 psi is then fed into the cylinder. A threaded coupling is screwed into a spark plug hole. Youll need a leak down tester industrial grade air compressor one large enough to run air tools a ratchet extension. This is where the greatest cylinder wear occurs.
The right hand dial will give a reading as a percentage. How to do a cylinder leak down test on an e46 bmw duration. Read and interpret the test results. How to perform a leak down test. When the leak down test tool is attached to the cylinder the next task is to attach the tool itself to the air compressor. Instead of measuring the engines ability to create pressure compressed air is introduced into the cylinder through the spark plug hole.
Once the compressor hose is connected turn the regulator clockwise to allow the air to flow into the cylinder.
Gallery of How To Do A Cylinder Leak Down Test
