Leak Down Test
08-11-2004, 04:41 PM
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Leak Down Test
Ok, Iam Looking At A Boat W/ 500efi With Only 14 Hours. I Had A Comp. Test Done 150-152 Across The Board. Good. The Leak Down Was 18%on The Low Side And 26% The Highest. The Boat Has Been Sitting-up Around 6 Months. What Do You Guys Think. Also The Motors Are 2002. Thanks In Advance.
08-11-2004, 04:55 PM
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Re: Leak Down Test
18 TO 26 PERCENT IS NOT THE GREATEST CONDITION FOR A LEAK DOWN YOU MAY WANT TO RESEARCH THAT A BIT FURTHER TO SEE WERE THE LEAK IS GOING IF ITS PAST THE VALVES ITS NOT TO BAD A VALVE JOB WILL MOST LIKELY FIX IT BUT IT MAY BE FURTHER INVOLVED.HOPE THIS SHINES A LIGHT LAZ MESA WWW.MESABALANCING.COM
08-11-2004, 05:35 PM
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Re: Leak Down Test
That is bad leakdown for a motor only having 14 hrs on it. Last winter I did leak down on a motor that I run on the edge of detonation with 10+ lbs of boost & worse was 15% after 100 hrs.
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08-11-2004, 06:05 PM
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Re: Leak Down Test
I Think It Is Due To The Time The Boat Has Set-up. Could Rust Have Got On The Values And Caused The Values Not To Seal. And Would Running The Boat Blow The Rust Out And Fix The Seal Issue.
08-11-2004, 06:12 PM
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Re: Leak Down Test
i was always told a cold leakdown test is a 1/2 step above useless. The engeinmust be at or close to operatign temperature so everything will seal right and not leak.
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08-12-2004, 11:57 PM
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Re: Leak Down Test
I agree, change the oil and filter first, put some time on the motors under load and then recheck the leakdowns on warm motors. If its just a little valve seat rust it will probably improve a lot. If it does not then squirt a little oil carefully in each cylinder and retest. If it then improves a moderate amount you've probably got ring issues and if it is still higher than 15%, you've got a major rebuild in order and the boat should price accordingly.
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08-13-2004, 08:37 AM
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Re: Leak Down Test
Originally Posted by Infomaniac
Leak down the engine while still warm.
