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Old 08-08-2006, 08:31 PM
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Cylinder Leak Down Tester?

I have a 67 327 engine with two cylinders next to each other with low compression. One has 110 the other 140. I am having a little trouble determining if its valves, rings, or head gasket (or all 3) with the compression gauge. Would a cylinder leak down tester pin point the exact location of the problem? Is this tool worth buying?

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Old 08-08-2006, 08:52 PM
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You should be able to hear where the air is leaking out from. If you hear it through the intake manifold or the exhaust it is obviosly a valve problem, if you hear it in the crank case it is a ring problem and if you hear it from another cylinder it is a headgasket problem.

If you have the same compression tester that I have it has an air fitting on the hose that connects to the guage. You should be able to hook this to your air hose and it will serve the puropse of a leak down tester, which is nothing more than an adaptor from the compressor to the spark plug hole.

Here is the one I have.
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Old 08-09-2006, 12:08 AM
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Cboy started a thread about leakdown testers a while back.
It has a couple of links to testing procedures using that tool.
Here it is Make your own leak down tester

Although you can use your compression tester hose in the same way as a leakdown /differential pressure tester to diagnose the problem component, the actual tester will give you a measureable indication of the condition of your rings, valves etc. A leakdown tester has a sized reference orifice that gives a benchmark to compare to.

If you work on cars with any regularity you will find a leakdown tester is a good tool to have. I don't think I've used my old compression tester once since I got my leakdown tester.

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BE different....ACT normal.

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Old 08-09-2006, 08:58 AM
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Snap on has a nice one,also good for setting up fuel injection barrell valve,Johnny
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Old 08-09-2006, 10:35 AM

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Using an oil can squirt some oil into the cylinders (about three to four squirts is enough) if rechecking the compression shows no change - problem above piston, If reading rises, problem likely rings. This is called a "wet " test.


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