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About 700 hours on 912UL.Have owned it for now 4 oil changes.
On magnetic oil plug I'd describe the layer of material about 1/32nd thick on the tip of it.
Not even sure if it was actually magnetic .... could've been carbon like sludge.
(Should have wiped it off and tested it with another magnet... but didn't think of that at the time.)

Dissected the filter, rinsed the catchings out with gasoline and pour through a white paper towel filter to see whats there. Not much of anything, and I'd have to describe the metal there as between "hardly detectable" and "non-existant."

So I'd bet big money that's withing "acceptable" limits.
Our local A&P guys jokes that "it there are no pieces in there that you can read serial numbers on you're OK" .... but he's used to Lycomings that routinely show filings in the filters much more than Rotaxes do. And I know, for example, that Lycoming considers finding 1/8th of a teaspoon of filings merely cautionary.... they say, essentially, change oil and filter, fly 25 hours and check again, and if little more shows up on the next check don't worry about it. If I found that much in our filter I'd consider that a major red light.

But I'm curious: What the acceptable, or cautionary, or "better take action on this" criteria on filings in the 912 filter or the magnetic plug are?
Are there photos of "normal" and "excessive" filings on the plug?
  • Re: Allowable filings/metal mag oil plug & filter

    by » 11 years ago


    Al,

    There are photos in section 12-20-00 of the line maintenance manual showing what the plug should look like. From people I've talked to, it seems pretty much like a personal judgement call. I pull my plug and swish it around in a cup of gasoline to remove the oil and see pretty much what you describe. Very little to non existent. I had more filings on my first oil change than I've ever had since. I understand this is normal also.

    You are right about the Lycs ana continentals. I have an 0-200 with about 400 hrs. on it and it always has a little more than my 912.

    Bill.

    Thank you said by: Al C

  • Re: Allowable filings/metal mag oil plug & filter

    by » 4 years ago


    I changed as new owner first time the oil of my Rotax 912 ULS, after 60 hr from previous oil change in a Czech maintenance firm. Engine has 1400 hr and in Czech the geabox was checked and maintained some needed parts renewed etc (at 1340 hr). Attached some pictures about the mag plug, is it to much or it is normal after the gearbox  maintenance?

    Regards

    Erki

    28125_2_Screenshot 2020-11-19 at 11.54.42.png (You do not have access to download this file.)
    28125_2_Screenshot 2020-11-19 at 11.55.10.png (You do not have access to download this file.)

  • Re: Allowable filings/metal mag oil plug & filter

    by » 4 years ago


    Since you just had the gearbox worked on this may be more to the normal side as things wear in. I would however change the oil again at the 50 hr. mark and see if it has changed. Usually it will be a little less, but taking a second look after another 50 hrs. would just be a good safe double check. Always better to be a step up on on a good maint. practice. 


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


  • Re: Allowable filings/metal mag oil plug & filter

    by » 4 years ago


    Look in the line maintenance manual for magnetic plug inspection information - https://www.rotax-owner.com/pdf/MML_912_Series_ED4.pdf

    Section 12-00-00 Page 53 & 54

     


  • Re: Allowable filings/metal mag oil plug & filter

    by » 4 years ago


    That page from the manual isn't too helpful, I must say.  One plug is basically free of filings ("acceptable") and the other is covered with them ("non-acceptable"), but it gives one no real idea of the acceptability of any condition between these two extremes, such as the photos in post #3.


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