VIEWS: 136 PAGES: 5 CATEGORY: Engineering & Energy POSTED ON: 6/11/2010
The problem with the diagnosis is that several possible starting problems will look the same, and - if left uncorrected - will eventually result in sprag clutch failure. So if you have kickback you may have need to replace the sprag clutch, but if you don't correct the other issue(s), you'll be going right back to damaging the clutch again.
Recip Technology Rotax Engines Understanding and troubleshooting R By James Careless otax engines are a popular choice Vogel: The three most common trouble- for certified light and homebuilt air- shooting items, in probable Pareto order, are craft, auto gyros, and military UAVs. carburetion, kickbacks, and ignition. Please Though you may not have encountered one understand, if these engines are properly yet, chances are you will in the future. set up and maintained, problems are next to So what sets the Rotax apart, and what non-existent. But if they do have problems, do you need to know to troubleshoot it? these are the most commonly seen. To answer these questions, AMT spoke with Rotax expert Dean Vogel of the AMT: What symptoms do carburetion Aero Technical Institute (ATI; www.aero- problems present, and how do you diag- technicalinstitute.com). Affiliated with nose them? Lockwood Aviation in Sebring, FL, ATI Vogel: With carburetors, the symptoms offers Rotax maintenance training courses. AMT: First, tell us about the Rotax engine. They are quite different from a Lycoming or P&W, aren’t they? Vogel: Yes. Rotax engines have much more in common with motorcycle engines than they do with tradi- tional aircraft engines. AMT: What makes them different? Vogel: Well, Rotax engines use liquid cooling to keep their size and weight down. They have five-piece crankshafts, rather than the traditional one-piece forging used in most aviation engines. And their oil tank is located outside the engine proper; allowing for a lubrication system that is effective with a lower oil quantity and sig- nificantly less weight. As well, Rotax engines use motorcycle oil — aviation engine oils are totally unsuitable — and automobile fuel. AMT: Now that we understand how different Rotax engines are, what are the three most common troubleshooting issues associated with them? 8 March 2009 Aircraft Maintenance Technology • www.AMTonline.com • www.AMTSociety.org Recip Technology will be engine roughness, and it may or may not be accompanied by a decrease in power. Once in a w
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