Ask Paul

QUESTION: I have a vibration problem with my IO-540-C4B5. I had a computer analysis done and it seems to be the engine instead of the prop. The test showed to add 96 grams at the 72° position and this seemed way out of tolerance. What can cause vibration instead of the prop being out of […]

QUESTION: I have a 1968 Mooney-F with an IO-360-A1A. The oil cooler was relocated to the J model position with an STC and the cowl openings have been changed to the J-model size. I have sustained oil temperatures of 206°-210° when leaned to 100° rich of peak and will reach 215°-220° if leaned to 75° […]

QUESTION: I have a chance to buy an engine on eBay that is a good deal for me. I have a Cessna 152 with a Lycoming O-235-L2C and am looking for a replacement. Problem is, the eBay engine was overhauled in Canada for installation in a Canadian experiment aircraft. It’s zero time since a major […]

QUESTION: I’m thinking of purchasing a C150 with an 0-320 engine, serial number 4800-027. It may be a D2J. Do you have any knowledge of the history of this engine and its serviceability? Or, could you direct me to another source of information? Arthur Dodd Jacksonville, Fla. ANSWER: From the engine serial number you provided, […]

QUESTION: I just read your article on the history of the 0-320-H2AD engine (What engines should I avoid, Dec. 24, 2004, issue). I have had three Skyhawks with the later engine (two 1977s and one 1979) and have had no problems with TBO — all went well past 2,000 hours. My question is about power. […]

QUESTION: My Lycoming IO-360-B1E engine will be majored sometime early next year and I am trying to educate myself. The facility I plan to use for the overhaul says that a reground cam is just as good as a new one. Could you please explain how a cam is reground. I don’t understand how if […]

From time to time I receive letters regarding various questions about warranties. If you’re like most people, it’s very seldom we really read and understand a warranty on a product. Having been responsible for the warranty on Lycoming engines at one point during my career there, I can tell you that gives one a whole […]

QUESTION: I’m operating a C-172 with a Lycoming O-360 engine at an approximately sea level airport. Is it normal to have to lean the mixture for ground operations and takeoffs? I have to or the engine runs a bit rough. Perhaps the mixture settings on the carb are not adjusted correctly, although some say it […]

QUESTION: Who did Lt. Russell Maughan take the air speed record from when he set the record in March 1923? Sue Hechinger Flower Mound, Texas ANSWER: Lt. Russell Maughan set his record in 1922, not 1923, when he won that year’s Pulitzer Race on Oct. 14 at 205.856 mph in a Curtiss R-6, beating a […]