The majority of the problems were caused by extended periods of inactivity, infrequent oil and filter changes, high RPM starts in cold climates without proper preheating, and more.
Ask Paul
Ask Paul: Why is our engine running hot in the summer?
What could be causing the EGT, CHT, and oil temperature to be so high when the OAT at 1,800 MSL is only 78°F?
How long to replace a carburetor on my Lycoming engine?
Estimated labor time for this replacement is about two hours.
Ask Paul: Why is the temperature so high on my left engine?
The secret to troubleshooting something like this is to be patient and only do one thing at a time.
Ask Paul: Why is my #3 cylinder running hotter than the others?
I’m suspicious of a partially blocked #3 cylinder fuel nozzle.
Ask Paul: Higher horsepower not always possible
The best advice? Look for a different aircraft.
Ask Paul: Why is my #1 cylinder so much hotter?
On a normally aspirated engine, with a carburetor, the fuel distribution between all of the cylinders is not equal.
Ask Paul: Why is my oil temperature so high?
First step: Check the accuracy of your gauges.
Ask Paul: A puzzling compression check
Can I have bad rings even when I get good compression numbers?