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recapen(at)earthlink.net
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 Posted: Tue Sep 28, 2010 1:50 pm Post subject: Sealant for hole plugs |
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I'm looking to re-seal the injector/primer hole plugs in the underside of my cylinder heads.
The injector nozzles in the top are supposed to be installed with anti-sieze and torqued to 40-60 inch-pounds.
I'm thinking the 40-60 inch-pounds would be consistent and either anti-seize or Loc-Tite 565 (white) would be used on the plugs. These are 1/8" NPT tapered fittings if I recall correctly.
Your thoughts please,
Ralph Capen
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flyadive(at)gmail.com
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| Posted: Tue Sep 28, 2010 2:36 pm Post subject: Sealant for hole plugs |
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HMMmmmmmm ...Where does the 40 - 60 in/lbs come from? If it is just for 1/8" NPT then ANY thing on the threads will act as a lubricant and you will actually be going over the 40 - 60 in/lbs.
Is it a number given WITH the anti-seize?
Bottom line - Pipe threads are totally different than straight threads. Just snug it up and go 1/4 turn further and you are done.
AND... The plug has a Allen socket... Did you do your math for the length of the Allen Wrench?
Do you really think Lycoming uses a torque wrench for this!
Barry
On Tue, Sep 28, 2010 at 5:47 PM, Ralph E. Capen <recapen(at)earthlink.net (recapen(at)earthlink.net)> wrote:
[quote]--> LycomingEngines-List message posted by: "Ralph E. Capen" <recapen(at)earthlink.net (recapen(at)earthlink.net)>
I'm looking to re-seal the injector/primer hole plugs in the underside of my cylinder heads.
The injector nozzles in the top are supposed to be installed with anti-sieze and torqued to 40-60 inch-pounds.
I'm thinking the 40-60 inch-pounds would be consistent and either anti-seize or Loc-Tite 565 (white) would be used on the plugs. These are 1/8" NPT tapered fittings if I recall correctly.
Your thoughts please,
Ralph Capen
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recapen(at)earthlink.net
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| Posted: Tue Sep 28, 2010 3:52 pm Post subject: Sealant for hole plugs |
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Thanks for the response.....
That number came from my fuel injection system manufacturer and they also specified anti-seize. I'll look up the spec in my lycoming manuals and see if it is different - you may be right with snug + 1/4 turn.
I have an allen socket that adapts to 1/4" drive - no additional math for the torque wrench.
But I still don't know whether to use anti-seize or 565.....
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