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Identify tubing on engine and function

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Joined
Jun 17, 2017
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I noticed during my oil change this line that tees and seems to terminate on three of each cylinder. Then trances back in the firewall. I ask because I noticed the bracket that is holding it seems to be loose with chafing on fitting was wondering if it should have rubber around bracket so not to cause damage to fittings. It has been vibrating and it is manages to rub a hole is it part of oil system with pressure? I thought this was drain back tubes but I think they are too small for that function. If anyone can explain or suggest a fix please let me know. 1968 Lycoming 0-320 piper. Cherokee.
 

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