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06-13-2016, 04:30 PM
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Join Date: Oct 2008
Location: CAMARILLO, CALIFORNIA
Posts: 119
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High silicon reading in oil sample
Oil analysis have shown high silicon reading (22ppm) the last three times.
I have cleaned the filters according to the recommended methods each time but still getting these high readings.
Anyone have some ideas as to how I am getting dirt entering the induction system or is it something else?
Gary
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06-13-2016, 05:05 PM
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Join Date: Jun 2007
Location: new iberia la
Posts: 768
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Silicone
Look over entire induction system carefully. All clamps, hoses and gaskets are suspect. Also look at how well the airfilter seals to the airbox.
Don Broussard
RV 9 Rebuild in Progress
Last edited by cajunwings : 06-13-2016 at 05:08 PM.
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06-13-2016, 06:58 PM
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Join Date: Sep 2009
Location: Port Orange, FL
Posts: 34
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Last time I had that is was the alternate air door being sucked open (the original one with the magnet latch)
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06-13-2016, 08:23 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by KRAUSEGB
Oil analysis have shown high silicon reading (22ppm) the last three times.
I have cleaned the filters according to the recommended methods each time but still getting these high readings.
Anyone have some ideas as to how I am getting dirt entering the induction system or is it something else?
Gary
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Some good ideas here, have you used RTV as a gasket sealant before the first high silicon samples? See Blackstone site and silicon.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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06-14-2016, 04:55 AM
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Join Date: Jan 2005
Posts: 1,009
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Valve Cover Gaskets?
I saw a spike when I changed from cork to silicone.
Terry, CFI
RV9A N323TP
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06-14-2016, 05:18 AM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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Are you using DC-4 or other silicone lubricant for the oil filter gasket? I have noticed that will cause a spike.
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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06-14-2016, 08:20 AM
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Banned
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Join Date: Apr 2015
Location: Altha, FL.
Posts: 114
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High readings on occasions are common especially with silicone. It is not cause for alarm. It can come from several sources. Look for trends and not always a single test. If a reading is serious then take another sample in 10 hours or so. Make sure your samples come from have way through the oil drain. You do not want the top or bottom oil from the tank. With your higher than normal silicone sample I would just wait until the next oil change. Keep the air filters clean and keep products with silicone away from the fuel system.
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06-15-2016, 06:37 AM
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Join Date: Oct 2008
Location: CAMARILLO, CALIFORNIA
Posts: 119
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Thanks to everyone
Thanks for the input on possible sources of silicon.
Question-Is there a problem if it turns out that the source in RTV contamination? Is this a serious problem with the engine, causing wear as would be the case with sand/dirt?
Gary
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06-16-2016, 01:47 AM
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Join Date: Jan 2011
Location: adelaide, south australia
Posts: 171
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As I understand it, silica is dirt, and silicone and silica are quite different from one another. I think 
DaveH
120485
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06-16-2016, 07:44 AM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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Quote:
Originally Posted by daveyator
As I understand it, silica is dirt, and silicone and silica are quite different from one another. I think 
DaveH
120485
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That's what I thought too, and I was a little confused... so I looked them up.
Quote:
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Silicones are polymers that include any inert, synthetic compound made up of repeating units of siloxane, which is a chain of alternating silicon atoms and oxygen atoms, frequently combined with carbon and/or hydrogen.
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Quote:
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Silica: the dioxide form of silicon, SiO 2, occurring especially as quartz sand, flint, and agate
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So... silic a and silic one can, if I understand correctly now, both be a source of sili con in an oil sample. Maybe if I'd had a better Chem teacher in high school I'd have known that before I was a hundred years old.
__________________
Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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