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06-24-2014, 10:21 PM
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Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
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The leak down test is a very poor tool for determining many things, but before we had borescopes that were cheap and EMS data to examine it was all we had.
One bad leak down is not a disaster. It may point you at looking for EMS data to confirm, it may point you to clogged up oil control rings, or it may be a bit of combustion deposit on a face.
Do them hot, do them through the LOWER plug only, and use the result in combination with a borescope and EMS data. The borescope and EMS data being the primary ones, for valves, and the leak down for rings.
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David Brown
DYNON Authorised Dealer and Installer
The two best investments you can make, by any financial test, an EMS and APS!
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06-24-2014, 10:35 PM
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Join Date: Aug 2007
Location: Wichita Falls, TX
Posts: 2,182
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Quote:
Originally Posted by turbo
it is amazing how easy it is to check your comps by just turning it over with the prop.
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Not quite so easy to do in that R-44, eh? 
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Neal Howard
Airplaneless once again...
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06-25-2014, 08:25 PM
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Join Date: Aug 2006
Location: santa barbara, CA
Posts: 1,680
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Quote:
Originally Posted by RV10inOz
Do them hot, do them through the LOWER plug only, and use the result in combination with a borescope and EMS data. The borescope and EMS data being the primary ones, for valves, and the leak down for rings.
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Why on the lower plug? Hadn't heard that before
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06-25-2014, 10:06 PM
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Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
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Ironically it is because that is the advice of one of Australia's leading engine shops.
Why you ask? Well they have had over the years a number of cylinders pulled and sent to them from workshops around the country with a poor leak down result, only to discover a tiny chunk of deposits from around the top plug has broken away and by sheer fluke the valve has been in just the right position to catch it.
They get the cylinder and it leaks like a sieve. They take the valve out (crud is on the plug side of the valve) clean the surfaces drop it back in and it seals log a frogs bottom!
Particles do not fall up.
May never happen to you, but it does happen.
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David Brown
DYNON Authorised Dealer and Installer
The two best investments you can make, by any financial test, an EMS and APS!
Last edited by RV10inOz : 06-26-2014 at 12:51 AM.
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06-25-2014, 10:43 PM
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Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,670
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Just curious, mind you....
Just how well do frog's bottoms seal? 
And how do you test it? 
Gotta love the Aussie lingo!! 
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Pete Hunt, [San Diego] VAF #1069
RV-6, RV-6A, T-6G
ATP, CFII, A&P
2020 Donation+, Gladly Sent 
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06-26-2014, 12:38 AM
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Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
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Ever asked a frog does he get water up his ....errr rear end when in da pond?
Ask Kermit, he should be a good talking frog example
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______________________________
David Brown
DYNON Authorised Dealer and Installer
The two best investments you can make, by any financial test, an EMS and APS!
Last edited by RV10inOz : 06-26-2014 at 12:52 AM.
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06-26-2014, 02:40 AM
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Join Date: Mar 2006
Posts: 192
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Maybe......
.......I'm more frog than I thought. Doesn't even leak back when I blow bubbles in the tub! Must be the French ancestry from way back! |
06-26-2014, 09:00 AM
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Join Date: Feb 2007
Location: Mpumalanga, South Africa
Posts: 1,065
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over-share.......
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Paul
Mercy Air, White River FAWV
RV-10 ZU-IIZ - "Zeus"
Building Bearhawk Bravo - RV-18 not available
2019 Donation Made
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