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Thread: Question about cylinder drain tubes

  1. #1
    algonquin's Avatar
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    Question about cylinder drain tubes

    Hi guyís, Iíve run across a O-320 narrow deck engine. The drain lines were leaking and found one tube over tightened and the flare at the cylinder fitting had been cut off. The tube looked very cobbed up also. So I took one off a parts engine and it didnít fit by at least a inch of line ing up. I tried one off a old O-235 I have and it was closer but not right. The data plate said itís a O-320 A2B but the parts donít fit. Any ideas, first time Iíve run across this one.

  2. #2
    RaisedByWolves's Avatar
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    spruce carries some that fit good and were reasonably priced

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    algonquin's Avatar
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    My question is why don’t the factory tube fit. I have tubes that are the right ones that fit another narrow deck engine and not even close on this one. Did they make cases with different locations for the return lines? Wondering if the 290’s are different and is it possible to mod a case to take 320 parts and cylinders on a 290 case

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    frequent_flyer's Avatar
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    I don't know the details of your engine but the O-360-A has 4 different part numbers for the 4 drain tubes. 3 and 4 are the same part number on some variants but not on all variants.

    Are you attempting to swap between same cylinder numbers of the same dash number engine?

    Edit - there appear to be only 3 different part numbers, not 4.
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    Last edited by frequent_flyer; 01-28-2023 at 09:36 PM.

  5. #5
    algonquin's Avatar
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    I’m just going to make a new tube that fits right, it’s the #4 cylinder so only one part # for it.
    Likes Charlie Longley liked this post

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    Charlie Longley's Avatar
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    Quote Originally Posted by algonquin View Post
    I’m just going to make a new tube that fits right, it’s the #4 cylinder so only one part # for it.
    They’re relatively simple tubes. I wish Lycoming and Continental for that matter had a more user friendly parts catalog. A parts guy in a decent sized FBO is worth every penny you pay him.

  7. #7
    Charlie Longley's Avatar
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    Hope you’re doing well Tom.

  8. #8
    algonquin's Avatar
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    Thank Charlie, doing well, hope you are also.
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    frequent_flyer's Avatar
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    Quote Originally Posted by Charlie Longley View Post
    I wish Lycoming and Continental for that matter had a more user friendly parts catalog.
    I have the O-360-A engine parts catalog and the PA-28 parts catalog in PDF. I usually find it easy enough to find a part number with basic or advanced search functions of Adobe Acrobat Reader. I would not attempt to find any information in a paper catalog if PDF was available.
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  10. #10
    algonquin's Avatar
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    Thanks FF, but this is a O-320 engine. Just a little different. There were so many variations of it.

  11. #11
    frequent_flyer's Avatar
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    Quote Originally Posted by algonquin View Post
    Thanks FF, but this is a O-320 engine. Just a little different. There were so many variations of it.
    I only provided the O-360 parts listing to show that the tubes were different between cylinders. I had the O-360 parts catalogue in my files. I found the equivalent O-320 information in about a minute.

    https://www.lycoming.com/sites/defau...g%20PC-103.pdf
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  12. #12
    frequent_flyer's Avatar
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    Quote Originally Posted by algonquin View Post
    Wondering if the 290ís are different and is it possible to mod a case to take 320 parts and cylinders on a 290 case
    The O-290 does seem to use different drain tubes than the O-320 and O-360. Only ever worked on the O-360 so just going on catalog research.

    https://www.lycoming.com/sites/defau...PC-102-1_0.pdf
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