markgrue Posted September 7, 2021 Report Share Posted September 7, 2021 Found an interesting problem during an annual on a 63C. When I removed the Exhaust I found a crack in the exhaust heat exchanger. It seems it was blowing exhaust on the front of the carburetor. It was like having the carb heat on all of the time. Low power and running rich. Fuel burn was considerably higher than normal. I think it occurred because the rubber rear support on the firewall had failed in the past and all of the weight of the pipe was on the heat exchanger weld. The support had been repaired but the crack was not found until the exhaust was removed for the annual. Mark Quote Link to comment Share on other sites More sharing options...
Yetti Posted September 7, 2021 Report Share Posted September 7, 2021 Not a crack. rusted away. Quote Link to comment Share on other sites More sharing options...
carusoam Posted September 12, 2021 Report Share Posted September 12, 2021 Mark, looks like the weld got stressed and broke… Did you get high CO readings with that? Having the exhaust dump in front of the carb has a tendency to have CO enter the cabin in measurable amounts… Heating the carb… that is a whole new meaning for carb heat… Did you have a FF meter indicating higher fuel flow? Or was the FF actually higher than normal? Best regards, -a- Quote Link to comment Share on other sites More sharing options...
N201MKTurbo Posted September 12, 2021 Report Share Posted September 12, 2021 Looks like the heater shroud wore through it and it eroded at the leak. Looks like it has been leaking for a while. Doesn’t matter, it needs repair no matter how it happened. Quote Link to comment Share on other sites More sharing options...
markgrue Posted September 13, 2021 Author Report Share Posted September 13, 2021 No fuel flow meter. I think the broken pipe hanger caused the Crack and even after I fixed it the crack eroded more Quote Link to comment Share on other sites More sharing options...
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