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Tool Talk Discussion Forum

Proprer way to do a leak down test on a 2 cycle engine?

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Author  [Modern View]

11-08-2018 16:30:02

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What is the proper way to do a leak down test on a 2 cycle engine. What pressure would you use.

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11-09-2018 03:53:34

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 Re: Proprer way to do a leak down test on a 2 cycle engine? in reply to wsmm, 11-08-2018 16:30:02  
I had the spark plug on one cylinder of a kohler command that would carbon up. I bought a leak down test kit. Both good and bad cylinder showed good. Compression test on both cylinders showed the same.

I pulled the head off bad cylinder, ground the valves, and solved the problem.

I have little confidence in a leak down test.

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11-08-2018 17:56:18

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 Re: Proprer way to do a leak down test on a 2 cycle engine? in reply to wsmm, 11-08-2018 16:30:02  
Block off intake and exhaust, and pulse port to carburetor if it has one, pressurize crankcase, My only specs are from a Husqvarna manual, pressurize to 10 psi, should not leak below 7 psi in a minute.

Someone on here a while back said to also test with 10" vacuum. I would guess it should not go below 7" in a minute. They were saying some seals leak air in but not out.

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David G

11-08-2018 19:11:26

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 Re: Proprer way to do a leak down test on a 2 cycle engine? in reply to t.r.k., 11-08-2018 17:56:18  
10" of vacuum is about 5 PSI, 7" about 3.5 PSI

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