What parts can I use in my 1955 engine?

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?

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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 as the engine for my PA-22. I’m thinking of either replacing my engine or overhauling it, but I’m not quite sure what to look for in either case.

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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 up with fuel injection. Are some of these versions the same engine or were there three engines?

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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?

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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.

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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.

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EGT: What’s normal

I own a 1974 Grumman AA-5, SN550. Last winter I had the engine (O-320) rebuilt. I have a question about EGTs.

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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 the common magneto gear on that engine failed, causing him to lose both mags and forcing him to make a deadstick landing. He felt that it was a rare event for that gear to shear but, maybe on second thought, not so rare.

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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.

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Where are the expert answers? Unhappy reader tired of being told to “”look it up””

I am having a hard time finding any usefulness in your column. People ask specific questions and you tell them to look it up. As a reader, I would like to see some sort of expert answer to their questions. Like the mag check, what is your opinion (What’s the best way to test a mag, Oct. 6 issue)?

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