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Torque value for crush washer type plug

Bavafa

Well Known Member
I know there is a procedure for properly tightening a plug with a crush washer type (i.e. oil screen plug) but I have forgotten it. I know tthat the crush washer is installed with the slit part to the non-moving side and you are suppose to hand tighten it and then xxx number of turns. What is the xxx
Please correct me if I remember the whole thing incorrectly
 
Thank you.
If I read this correctly, it says turn 90 degree for copper after the surfaces touch. Only quarter of turn seems a bit less than what I remember but it says so in this guide so I must have remember incorrectly.
 
I've been using 3/4 of a turn for a long time and no leaks, but apparently I've have been over torquing.
 
135 degrees

Turn it 135 degrees after contact, no more. I turned it a tad more than 135 exactly one time and of course it leaked and I had to go back and fix it.


Thank you.
If I read this correctly, it says turn 90 degree for copper after the surfaces touch. Only quarter of turn seems a bit less than what I remember but it says so in this guide so I must have remember incorrectly.
 
Thank you.
If I read this correctly, it says turn 90 degree for copper after the surfaces touch. Only quarter of turn seems a bit less than what I remember but it says so in this guide so I must have remember incorrectly.

Check the parts catalogue for your engine. I show that oil screen plug as 1.00x20 Lycoming P/N LW-12545, so 20 tpi, which takes 135 degrees, not 90.
 
Thank you.
If I read this correctly, it says turn 90 degree for copper after the surfaces touch. Only quarter of turn seems a bit less than what I remember but it says so in this guide so I must have remember incorrectly.

The number of degrees depends upon the thread pitch. The courser the thread, the fewer the degrees of turn.

Larry
 
Print the last 2 pages and laminate, very useful reference for general maintenance.
 
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