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Question Do we need copper crush washers with Denso IK27 automotive plugs?

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Neal

Neal

Forums Chief Pilot
Staff member
Joined
Oct 31, 1996
Posts
1,051
Type aircraft owned
Carbon Cub FX-3
Base airport
KFCI
Ratings
COMM, IFR, MEL, SEL
A friend of mine is about to change his plugs in his FX-3 and he’s being told to use copper crush washers. I don’t know anything about this and just use the two washers that come with the plug. Can someone educate me on the proper procedure to change these plugs and parts required please?

IMG_6457.jpeg
 
In further conversation it seems he was talking between the step down adapter and the cylinder and not between the plug and adapter.
 

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