December 2007 Issue
Thielert Diesel Reliability: Mixed at Best...
...a market killer at worst. Many owners say they’re unhappy with the service and support for Thielert’s aerodiesels. An improved version, says Thielert, will fix faults.
When Diamond pulled the wraps off its proposed DA42 Twin Star at the Berlin Airshow in May 2002, we thought they’d lost touch with reality. A new twin in the current market? And powered by automotive-influenced diesel engines just then at the prototype stage? Surely they were joking.No, they weren’t. And 350 Twin Stars later, the joke’s on us. The Twin Star has been a smash hit, especially in Europe and Australasia, where avgas is $8 a gallon, if you can find it at all. But there’s some tarnish on this bright success story. The Thielert Centurion 1.7 engines that power the Twin Star have accumulated what many owners consider to be a poor service history, with numerous premature replacements, cylinder head cracking and at least 22 inflight stoppages that Thielert confirms.
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