My 1955 Tri-Pacer original Lycoming O-320 engine was torn down and inspected. It has a Part No. 74166 camshaft gone bad (#3). I found a P/N 76097 camshaft. Is it OK to use this part number for the engine? WENDELL HAMILTON Broken Arrow, Oklahoma Wendell, to answer your question, no, you cannot use the P/N […]
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Confused about replacement parts?
Q, I have a Lycoming O-320 150 hp engine with no suffix in my PA-22 Tri-Pacer. In one of your articles you list the O-320-A1A and the O-320-A3A as the numbers to refer to for replacement parts. Lycoming does not list an O-320-A1A and shows the O-320-A3A fitting a Piper PA-23. Lycoming lists the O-320-E3D […]
The XR-7755: The whole story
I was reading about the XR-7755 on the Internet and was wondering if you would clear something up for me. Most sources say there were two engines made, but I’ve found there were three versions. The first was set up for a single output shaft, a second had contra-rotating shafts and the third was set […]
Can we convert from dual mag drive to separate drives?
Can we convert a Lycoming O-540-J3A5D from dual mag drive to separate drives? Can it be done on a 1980 Dakota 236? Our club, The Flying 20 Club of Danbury, Conn., has three planes, a Dakota and two Archers. Recently,during the overhaul of one of our Archers, N8198P, we had the plane equipped with the […]
Confusion abounds on difference in rocker arms
I’m confused about the rocker arm differences on the O-360-A4K parallel valve cylinders because I know about the extreme heat that the exhaust valves endure. My question is why does the intake rocker arm #69444 have the extra oil hole that leads to the intake valve shaft to cool and lubricate it while the exhaust […]
Can I install a constant-speed prop on my engine?
I have a Lycoming O-360-A3A in my Cherokee. According to the Type Certificate Data Sheets (TCDS), this engine is similar to an -A1A, except without provisions for a constant speed prop. Nevertheless, it is equipped with a hollow crankshaft, and there is a pad on the accessory case for a prop governor. A friend told […]
EGT: What’s normal
If you notice a sudden change compared to what you’ve experienced, then a chat with your maintenance technician might be in order.
Are dual mags reliable?
I own a Cessna R-182 that has a Lycoming O-540 J3C5D engine. It seems like a great engine and runs well. I have a concern about the “”dual-pack”” type magnetos that run off a common gear. Yesterday, another pilot told me of an engine failure that he had years ago in a Cherokee Six where […]
And now, the rest of the story: An update on increased levels of copper in oil
After my Nov. 3 column, “”Why are there increased levels of copper in my oil?”” was published, I received some valuable advice from industry experts on the subject. After doing further research, here’s the rest of the story: First of all, the column was on the mark, but I feel I may have been off […]