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Thanks everyone for responding. Not sure what the egts are running. #5 cylinder is the one running hot. Mechanics are bringing something to test the fuel flow tomorrow. The belts and fan were checked and had no slippage. No cold weather baffle kit either. Oh and forgot to say that this problem...

Thanks for the warm welcome. We talked to Lycoming and they could not offer any more advice than their trouble shooting page. We asked questions and they went down the check list. Not much help at all. Hopefully we will figure it out somehow. Change enough parts and almost 100 percent chance it...

Good afternoon. I am asking this question because we are at wits end. I am a helicopter pilot for a police department in La. We currently operate a R44 with a Lycoming IO-540 engine. We are having a problem with HIGH cylinder head temps (red line). We have tried everything we can think of but...