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delmas

leak down test

8 posts in this topic

The engine is locked in place so the piston will not be forced down to BDC, opening a valve, and then air is fed into the cylinder through a manifold with two gauges and a restricted orifice between them. The tool shows what percentage of the air pressure leaks away. It makes diagnosing the sources of compression/combustion losses much simpler since the escape path can be located while it is actually leaking.

http://en.wikipedia.org/wiki/Leak-down_tester

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What is the best way to hold the piston in place when you crank up the air pressure? Put the bike in gear and hold down the rear brake? Or a big breaker bar on the rotor? Anything else that works well? 50-100 psi can be a lot of force.

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What is the best way to hold the piston in place when you crank up the air pressure? Put the bike in gear and hold down the rear brake? Or a big breaker bar on the rotor? Anything else that works well? 50-100 psi can be a lot of force.

used a 1/2 breaker bar or a ratchet to lock it in place. This way you can listen to find where the leak is.

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