Roger Lee Posted January 1, 2011 Report Share Posted January 1, 2011 You should always check your magnetic plug at oil change. This is a Rotax service bulletin that has been out for some time. Take a look and see why. Very rare indeed. This would be your nightmare, although I suspect it could be worse with multiple chunks. It should come out looking very clean as I see them with Amsoil or with only a very very slight black fuzz. (And I do mean very slight) Link to comment Share on other sites More sharing options...
Roger Lee Posted January 1, 2011 Author Report Share Posted January 1, 2011 Starting the new year right. I have put this out before, but for those who have never read or seen it here it is again. An Oil Comparison. It shows what different motorcycle additives do for our engine to protect it and how a few oils compare. Oil Comparison.pdf Link to comment Share on other sites More sharing options...
Runtoeat Posted January 2, 2011 Report Share Posted January 2, 2011 Roger, that's a pretty knarly looking magnetic plug. Any guesses what that little piece of metal is that's on it? Looks ike it was a serrated piece of metal. Good oil comparison chart. Thanks. Link to comment Share on other sites More sharing options...
Roger Lee Posted January 2, 2011 Author Report Share Posted January 2, 2011 The piece is from the gear box. This was one reason Rotax had many replace the gear set a few years ago. It was from poor metallurgy. Link to comment Share on other sites More sharing options...
Jeremy MacGregor Posted January 6, 2011 Report Share Posted January 6, 2011 There is a piece on in that photo that looks to be about a mm long, I have seen that exact situation 3 times before including my own engine. That is not from the gear set, judging by it's shape it's more likely it came from the prop shaft splines just aft of the vacuum pump drive gear. I still have the 3 prop shafts sitting on my desk, all missing the same piece. Most of the metal on your mag plug is going to be from the (3) disk spring washers inside of the gearbox, they wear continuously through out the life of the engine. Although some oils drastically lower this wear. I have only seen one instance when metal has chipped off the main dog gear and that was because of a sever prop strike. I would highly recommend checking the shaft, you don't necessarily have to worry about a failure but it's something you want to get taken care of, if a chip more than 1.5 mm is found the aircraft must be grounded until the cause is determined. Link to comment Share on other sites More sharing options...
airhound Posted November 26, 2011 Report Share Posted November 26, 2011 Starting the new year right. I have put this out before, but for those who have never read or seen it here it is again. An Oil Comparison. It shows what different motorcycle additives do for our engine to protect it and how a few oils compare. Hey Roger, Good speaking with you today. I was wondering; My Rotax came with Mobile 1 in it from the factory where they swear by it. I read its good with nolead mogas. But its had some 100ll put through it. So, its time and I will put aeroshell sport 4 in it. Anyway my concern is---will I be causing a problem with just draining the oil sump and changing filters? Is there old oil still in the oil lines and cooler which shouldn't be blended with the new different oil? Also, I saw were CPS sells a air purge kit....I don't need that do I? I haven't disconnected any oil lines or turned the prop while the oil is out waiting for me to take off that stubborn filter. I'm changing the plugs too. So, should I take them all out, finish the oil change then spin the engine with the starter until oil presssure is observed, then put the plugs back in?? Thank You! Doug in IL Link to comment Share on other sites More sharing options...
Roger Lee Posted November 26, 2011 Author Report Share Posted November 26, 2011 Hi Doug, Don't worry about the oil left in the system. Just pour in 3 qts of your Aero Shell.. No purge necessary so long as you don't turn the prop or drain the oil lines. Link to comment Share on other sites More sharing options...
airhound Posted December 13, 2011 Report Share Posted December 13, 2011 Hi Roger, Does the ROTAX slow to a stop or just stop abruptly when fuel starved while in cruise? I mean it doesnt windmill does it? dj Link to comment Share on other sites More sharing options...
Roger Lee Posted December 14, 2011 Author Report Share Posted December 14, 2011 The engine will cough and gag until it is drained of fuel. When the engine finally quits firing, the answer is yes it will windmill at cruise speeds. You will need to slow down to approximately 60 knots. Link to comment Share on other sites More sharing options...
josjonkers Posted December 14, 2011 Report Share Posted December 14, 2011 I have tried this once and on my plane everything was running fine until it was starved of fuel and just stopped. My speed was aound 95 kts and it did not windmill and the propped just stopped. Link to comment Share on other sites More sharing options...
airhound Posted December 14, 2011 Report Share Posted December 14, 2011 Jos, was there any warning and what starved it? Link to comment Share on other sites More sharing options...
josjonkers Posted December 14, 2011 Report Share Posted December 14, 2011 No warning prior to it just stopping. No hiccups, no roughness, just stopped. Prop also stopped, no windmilling whatsoever. Pushed it to the pump and filled her up with 128 liters of fuel, started and taxied to the hangar. Link to comment Share on other sites More sharing options...
airhound Posted December 14, 2011 Report Share Posted December 14, 2011 Thanks for the SA..Jos! Link to comment Share on other sites More sharing options...
josjonkers Posted December 15, 2011 Report Share Posted December 15, 2011 No warning prior to it just stopping. No hiccups, no roughness, just stopped. Prop also stopped, no windmilling whatsoever. Pushed it to the pump and filled her up with 128 liters of fuel, started and taxied to the hangar. Oh, forgot to say that I landed first..... Link to comment Share on other sites More sharing options...
Runtoeat Posted December 15, 2011 Report Share Posted December 15, 2011 Jos, you take a lot of videos, did you capture your engine out? It must have happened pretty close to the runway since you made the airport. Link to comment Share on other sites More sharing options...
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