Ask Paul

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: Last year I bought a 1971 C172L model with a Lycoming O-320-E2D. When I bought the plane I did an annual at the same time and for the most part everything was fine. This year it was discovered that the camshaft had been damaged along with lobe wear on the No. 4 cylinder. I […]

QUESTION: Can you explain the lifter bleed down check procedure in detail (or tell me where I can find it) for my IO-360-B1E on my 1967 Arrow? Wayne Whittington Blackwell, Okla. ANSWER: Wayne, I suggest you focus your attention on Lycoming Service Instruction 1011H. It will give you the general inspection requirements and checks for […]

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 […]

QUESTION: First, let me say thanks for your excellent column. It’s always one of the first things I flip to when GANews arrives. In my 1947 PA-12 (I’m new to the plane, purchased after complete restoration), I have an O290-D2B with about 18 hours on a new limits field overhaul, including new exhaust valves, seats, […]

QUESTION: I have a Glasair, started by someone else, with an IO-320 engine. He has a fuel return line from the side of the throttle body going back to the bottom of the header tank. It is my understanding that there is not supposed to be a fuel return line on this system. I can’t […]

QUESTION: I purchased a Lycoming HO360-BIB to use in an experimental aircraft. I have to convert from a rear pressure carb to a downdraft carb. I purchased a sump (part #71871) for this conversion. This is the part number from an early Lycoming parts catalog for most 180 hp 360s. This sump has tubes that […]

QUESTION: Paul, I have a Lycoming 0-235C1B installed in a Piper Colt. What are your feelings about an STC to install either an 0-290 or 0-320 engine in this aircraft? The 0-235 needs a top-end now, so I’m considering selling the engine as a core and installing one of the other engines. Mark Casillas Memphis, […]

QUESTION: I operate a IO-540C4-B5 in an experimental. I am wondering about the correct position of the mixture lever after idle cutoff has been selected. Should I leave the lever in that position, or should I advance it (after the ignition is switched off) to full rich? Is there any benefit to the internals of […]