Roger Lee Posted January 1, 2013 Report Share Posted January 1, 2013 Hi All, Many are starting to get to the 600 hr. (100LL users) or the 1000 hr. (91 oct. users) gearbox removal and inspection and is usually time to re-shim. Just a reminder on gearbox removal. I have a Remos in the shop with oil all over the engine and belly of the plane. The owner thought it was the oil pump housing. That's fairly rare and it is more likely the gearbox seal. I pulled the gearbox and found some sort of sealer I couldn't identify. I was hard and brittle, exactly what you don't want in a close tolerance high vibration service. The real eye popper was all the gouge marks on the gearbox hosing seal face and the crankcase side of the gearbox. The logbook said the mechanic that removed the gearbox last did it "IAW" (in accordance with) the Rotax maint. manual. Evidently that was stretching the truth. He had pried off the gearbox. Here was another case of a mechanic failing to read and ask questions and educate before performing a task he had never performed. These gearbox's MUST be pulled off and then use the proper flexible high vibration resistant sealant to re-seal the metal to metal surface. If you do not attend a Rotax school then you are bound to cause problems sooner or later working on a Rotax, especially if you then fail to get educated by reading the manual and asking questions from someone who has performed the task before. I hope I was able to smooth out the gouges with some 600 grit and hope the proper Loctite sealant will hold the seal. If not a new gearbox is in this Remos's future. Always ask if your mechanic has performed a specific task and if not make sure they read and call and experienced mechanic that has performed that task. It's in your's and his best interest, time and money wise. Maybe even travel a little farther for a specific rarely done task to get it done. Here is a picture of a poor man's gearbox puller. It is inexpensive to make and works very well. If you rarely pull a gearbox you may not want to spend a bunch of money on a fancier puller. Link to comment Share on other sites More sharing options...
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