---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Fri 02/22/13: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:48 AM - Re: 912 gearbox problems?? (John Gilpin) 2. 05:59 AM - Re: 912 gearbox problems?? (Thom Riddle) 3. 12:49 PM - Re: 912 gearbox problems?? (Roger Lee) ________________________________ Message 1 _____________________________________ Time: 12:48:20 AM PST US From: "John Gilpin" Subject: Re: RotaxEngines-List: 912 gearbox problems?? So the lead causes the clutch to lock up rather than slip easier. If a torque check on the friction clutch is right on spec, does that mean that any lead that might be present isn=99t really a problem?? JG ________________________________ Message 2 _____________________________________ Time: 05:59:54 AM PST US Subject: RotaxEngines-List: Re: 912 gearbox problems?? From: "Thom Riddle" Roger is spot on regarding lead buildup in the gearbox slipper clutch. A couple years ago, I did a gearbox inspection on the Diamond Katana which I am now part owner. The type certificated Rotax engines, in this case 912-F3, all use the slipper clutch in the gearbox, even the 80 hp ones like in the Katana. Before I bought into the airplane it had been flown exclusively on 100LL for its 1000+ hours at the time of its first gearbox inspection (yes, way overdue). The gearbox was in fine shape except for the slipper clutch which I sent to Lockwood Aviation for cleaning and inspection. They told me they had never seen a clutch so badly gummed up with lead as this one was. It has been back in service now for more than a year and we did the auto-fuel SB to allow us to fly the Katana with E10 of 87 octane (80 hp engine). I burn 87 AKI E10 during most of the year when flying regularly but when winter comes I fill the tank with 100LL and end up using less than one full tank of 100LL/yr because the winter wx here does not allow much flying. Because this is a type certificated engine/airplane, fuel additives like Decalin or Stabil are not permitted. If Stabil were permitted I'd keep auto-fuel in the tank all year, with Stabil added for winter, and use 100LL only when traveling where auto-fuel is not available. I use 100LL in the winter, when it is rarely flown, because it does not deteriorate quickly like auto-fuel does. But I do use Formula Shell semi-synthetic oil which is on Rotax's list of approved oils. -------- Thom Riddle Buffalo, NY (9G0) Kolb Slingshot SS-021 no engine FOR SALE Diamond Katana DA20-A1 Rotax 912 F3 Don't worry about old age... it doesn't last very long. - Anonymous Read this topic online here: http://forums.matronics.com/viewtopic.php?p=394799#394799 ________________________________ Message 3 _____________________________________ Time: 12:49:46 PM PST US Subject: RotaxEngines-List: Re: 912 gearbox problems?? From: "Roger Lee" Lead will not lube anything in our engine and it will gum up the slipper clutch and leave deposits all over. When you do a friction torque test on the gearbox it has nothing to do with the clutch itself. It is only testing the amount of pressure the Bellville washers are exerting on the dog gear set. Typically the higher the test numbers the better. Average is usually 440-485 in/lbs. If you can stay away from 100LL as much as possible you are way ahead of the extra maint. cost and time involved. The other problem is most owners don't maint. their engine enough or read the manual so by the time lead is a real problem it has done its damage. 100LL users must change oil more often (25 hrs) and they have shorter maint. time schedules for other components compared to 91 Oct. users. 100LL is a costly fuel in more ways than one. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center - Heavy Maint. 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