Bob737 Posted March 21, 2018 Report Share Posted March 21, 2018 I noticed the O ring binding in the threads as I unscrew the fuel cap. I purchased a new set of O rings from Lockwood Aviation and the same thing is happening. Is there a lubricant than I can use that’s safe with the fuel to prevent the O-ring from rolling on the threads as I open the tank. Link to comment Share on other sites More sharing options...
Tom Baker Posted March 21, 2018 Report Share Posted March 21, 2018 The O-ring doesn't get into the threads, but rather the mating surface above the threads. Just a dab of engine oil off the dipstick will help for a while.. You will need to reapply when it gets sticky again. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted March 21, 2018 Report Share Posted March 21, 2018 I have used white lithium grease, it works longer than oil and is fuel soluble so won't cause any issues. I have to reapply about 4 times a year. Link to comment Share on other sites More sharing options...
Bob737 Posted March 21, 2018 Author Report Share Posted March 21, 2018 Thank you both for the suggestions. I was wondering why after having the plane for seven years this O-ring rolling has just begun. I thought the old rings just stretched but the new ones from Lockwood are doing the same. I have tried the engine oil from the dip stick but it does not last. I will try so white lithium grease. Link to comment Share on other sites More sharing options...
Tom Baker Posted March 21, 2018 Report Share Posted March 21, 2018 You might also try cleaning the inside of the filler neck. There might be some dried fuel residue causing the sticking. Link to comment Share on other sites More sharing options...
WmInce Posted March 21, 2018 Report Share Posted March 21, 2018 4 hours ago, FlyingMonkey said: I have used white lithium grease, it works longer than oil and is fuel soluble so won't cause any issues. I have to reapply about 4 times a year. x2 Link to comment Share on other sites More sharing options...
CTMI Posted March 22, 2018 Report Share Posted March 22, 2018 X3 Link to comment Share on other sites More sharing options...
Tom Baker Posted March 23, 2018 Report Share Posted March 23, 2018 1 hour ago, Roger Lee said: Just had a CTLSi with the same thing. It isn't the "O" ring. It is the plastic edge just above the "O" ring that seats down inside and flush with the top. Just sand this down some and it will be smooth operating. Roger, I know you know this, but the CTSW and CTLSi have different style caps. Link to comment Share on other sites More sharing options...
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