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  #1  
Old 12-31-2015, 07:03 AM
vic syracuse vic syracuse is offline
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Default Check those oil screens

I come across many RV's whose operators forget to check the oil screen on the engine. It should be checked at least once per year during the annual or whenever the internal health of the engine is in question. Here is a picture of one I removed from an RV10 yesterday that should drive the message home. IO-540 with 10:1 pistons and only 600 hours. I don't know when the screen was last checked, but clearly there is lots of blowby. All of the chunks were carbon, the screen was about 50% blocked, with one cylinder at 48/80 and 54/80 and all of the leakage going by the rings.


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Last edited by vic syracuse : 01-01-2016 at 07:23 AM. Reason: spelling
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  #2  
Old 12-31-2015, 08:04 AM
BillL BillL is offline
 
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Vic, Did that engine have piston cooling jets? I have been wondering about exactly where that forms in the engine. I assume it has electronic ignition too?

Thanks.
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  #3  
Old 12-31-2015, 08:12 AM
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bret bret is offline
 
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WHAT is in there?
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  #4  
Old 12-31-2015, 08:37 AM
vic syracuse vic syracuse is offline
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Default Carbon

They are chunks of carbon from excessive blowby. I don't know if it has piston cooling jets. It could, as it is a Lycon supposedly rated at 317 HP (10:1) pistons.
I have seen small bits of carbon in other oil screens and in oil filters, but none ever this large or in such a large volume.

Vic
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  #5  
Old 12-31-2015, 08:44 AM
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Toobuilder Toobuilder is offline
 
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Default

Ive seen one or two of those carbon chunks in my time, but that looks like the inside of a rock tumbler.

I also remove and inspect that screen at every oil change.

It seems funny to me that people take the time to cut open an oil filter, fan out the media and inspect for tiny slivers of material, yet ignore this "pre filter".
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Last edited by Toobuilder : 12-31-2015 at 08:47 AM.
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  #6  
Old 12-31-2015, 09:33 AM
Tom Martin Tom Martin is offline
 
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Vince, what brand of cylinders were they?
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  #7  
Old 12-31-2015, 09:56 AM
vic syracuse vic syracuse is offline
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Default Titan

They are Titan's.
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  #8  
Old 12-31-2015, 10:19 AM
PCHunt PCHunt is offline
 
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See this OLD post for a discussion:

http://www.vansairforce.com/communit...ght=Oil+Screen
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  #9  
Old 12-31-2015, 10:49 AM
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boom3 boom3 is offline
 
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I check my screen at every oil change. It only ads about 10 minutes and 1 crush washer to the job.

This last oil change I found a small piece of cork gasket from when I changed my valve cover gaskets. I was super careful scraping the old gaskets off but I obviously missed seeing this small piece fall in.
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  #10  
Old 12-31-2015, 11:04 AM
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jetjok jetjok is offline
 
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Default Lycoming SI

In addition to excellent advice already stated by Vic, I wanted to point out that Lycoming SI 480E addresses checking the suction screen.
As I seem to be not clever enough to post the .pdf link, I have added the germane section. There is more info included in the document.

I. Oil and Filter Change and Screen Cleaning.
A. At 25 hours after the first replacement/screen cleaning – oil change, filter replacement or pressure screen cleaning and oil sump suction screen check for new, remanufactured or newly overhauled engines and for engines with any newly installed cylinders.
B. 25-Hour interval – oil change, pressure screen cleaning, and oil sump suction screen check for all engines employing a pressure screen system.
C. 50-Hour interval – oil change and oil filter replacement and suction screen check for all engines using full-flow filtration system (except for engine models TIO-540-AF1A and -AF1B, which require 25 hour interval changes).
D. A total of four (4) months maximum between changes for systems listed under “A”, “B” and “C”.
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