Read my oil/filter analysis - 912S

by Mat Khokhar in 912 / 914 Technical Questions 8 years ago

Hello.
Just got the analysis done at AV Labs. Everything looks good but what could be the major source of grit be in the filter.
As a background, it's a 2007 Rotax 912s.

HISTORY
1096 hrs (11/20/2014) - Oil Change done by previous owner. Gearbox was removed. Airplane sat in hangar without gearbox for 1.5 years.
1151 hrs (2/7/2016) - I bought the airplane. Installed new gearbox, purged air from system. Did oil change and installed new filter. Aeroshell Sport Plus 4.
1163 hrs (4/9/2016) - Changed oil and filter. Sample sent. This is the sample you are reading. Changed oil soon because I wanted an early reading on the sample.

Thanks & regards,
Mat

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Re: Read my oil/filter analysis - 912S

by David HEAL » 8 years ago

David HEAL

23 186 410

"Grit" in the oil typically reflects a poor fitting, loose, or dirty air cleaner. It can also be reflective of recent major engine work or the long period of "open engine" storage. I usually discount the first oil sample after major engine work since: 1) there is usually some residual crud in the engine that gets cleaned out at the first oil change and 2) one initial oil sample is not sufficient for a meaningful "trend" analysis. I would check the air filter(s), change the oil and filter, and check the oil again in @ 25 hours -- this assumes that all other engine operating parameters are normal.

ps -- I am not an A&P; just a private operator of a ROTAX 912 ULS. You should seek professional advice. B)

Thank you said by: Mat Khokhar

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Re: Read my oil/filter analysis - 912S

by Roger Lee » 8 years ago

Roger Lee

125 5.12k 4.53k

Hi Mat,

Why a new gearbox? Your grit may have come from this work or you putting everything back in service after a long down time.. This is the oil filter's job is to remove particles.
Actually it looks pretty good. Since you just changed the oil and the grit part is bothering you do another sample at 25 hrs. and compare. A filter will always have something in it if it is lab tested versus just cut open and looked at with the naked eye.

I use Avlabs too for an annual sample, but don't send my filters in.

I look at my filters this way.

I cut the can open, cut out the paper filter element, put it in a small jar with about 1" of gasoline, cap it and shake it gently for a little bit to wash the element. I pour all the jar contents over a white paper towel into something. The fuel and oil pass through and any particles stay behind no matter how small and stick out like a sore thumb. This makes it easy to see what was in the filter. You can look at the paper element after this, but it should be washed clean.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Thank you said by: Mat Khokhar

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Re: Read my oil/filter analysis - 912S

by Mat Khokhar » 8 years ago

Mat Khokhar

3 6 4

Thank you David & Roger.

It's a long story why the gearbox was removed...conflict between the two previous partners etc.
Not relevant :P

So, in Oct 2015 I had the plane transported from PA to FL in an open bed trailer. Maybe it picked up the dirt there since the gearbox was missing and there was a gigantic hole in it's place.
We replaced the gearbox with a shiny new one, also replaced an intake manifold with a new one. Did the carb syncs, carb rebuilds, spark plugs etc.
So the engine went through a very very thorough annual.
The first oil change we did, we drained the old oil completely. It had been sitting there for more than 1.5 years.
That is the reason my A&P suggested that we put about 10 hrs after all the work and then do an oil change again. This is the 10 hr oil and filter that I sent after all the major work.

BTW: What does the 40%-100% mean. Is it a range..meaning somewhere in between 40% and 100%.

Regards,
Mat

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Read my oil/filter analysis - 912S

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