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.

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

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.

Re: Leak Down Test
 

I see all kinds of red flags on this one. I wouldn't expect to see 26% on that motor after 240 hours.

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.

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.

Re: Leak Down Test
 

anybody else..............................thanks

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.
Raylar

Re: Leak Down Test
 

Leak down the engine while still warm.

Re: Leak Down Test
 

yes, the leak down was done when the motors were cold............also the compression test was from 150-160. its hard to see why there would be a issue with the motors with only 14 hours.