Q: I just bought a 1974 300-hp Cherokee Six. It has about 1,200 hours to run, has great oil pressure, good compressions, hardly uses oil, no metal in the filter, but during the run-up at 2,000 rpm, the engine makes quite a deep knock. If you go from both mags to either the left or […]
What are the best options for overhaul?
What I’m saying is, the total time on the engine would continue in the logbook and some of the major components that may have needed or required replacement will go uninspected, leaving lots of questions as to the reliability of continued operation.
Ask Paul: How do I know if this AD applies to my engine?
Q: I’ve heard there is an AD that prevents various Lycoming engines from being signed off as airworthy if the TBO is exceeded. I’ve also heard it doesn’t apply to engines manufactured prior to 1970. If the engine was original in the 1960s but remanufactured after 1970 would this AD still apply or would all […]
Ask Paul: What is causing sticking valve?
Q: In 2004, I bought a Lycoming O-320 D1A, via Van’s, and started flying it in January 2005 in a RV-9A. I broke it in according to the instructions (75% or more until oil consumption stabilized). In spite of having an oil filter I always do oil changes at about 30 hour intervals. All through […]
Ask Paul: Why is my Beagle Pup such a pig to start?
Q: I have a Beagle Pup 150 (the father of the Scottish Aviation Bull Dog) fitted with a Lycoming O-320 engine. When the weather is cold — in the UK this is anything less than 5° C — it has become an absolute pig to start, but once started it runs perfectly. The engine is […]
Ask Paul: Why are my #3 cylinder CHTs so high?
Lycoming actually does not know which cylinder runs the hottest on any particular engine installation. This is always defined by the airframe manufacturer from the various tests they conduct during the certification of the aircraft.
Ask Paul: What are these aluminum specks?
Q: I lost the left mag on my O-540. When I took it apart, I found four aluminum specks in the top oil screen. I pulled the rear housing off and found the aluminum gear still in the engine. I sent it off for repairs to Tulsa, where they installed a new oil pump, shaft, […]
Ask Paul: What’s the best engine for my Pacer?
Q: I plan to install an 0-360 with a constant speed prop in my Pacer, replacing my 0-320-A1A. I have a couple of engine choices under STCs, including the 0-360-C1A. I am looking for the lightest engine. Was this made as a narrow deck engine? If so, what serial numbers were narrow decks? Also, I […]
Ask Paul: What to do about oil-fouled plugs?
Q: My partner, Lou, and I just had our Piper PA 28 235 overhauled and are having problems with the lower plugs getting oil fouled. The plugs have been cleaned a couple of times but she runs rough and they foul again. The mechanics are talking about putting a thin wire plug in. My concern […]