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Spark plug torque on Denso IK27 spark plugs

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Neal

Forums Chief Pilot
Staff member
Joined
Oct 31, 1996
Posts
707
Type aircraft owned
Carbon Cub FX-3
Base airport
KFCI
Ratings
COMM, IFR, MEL, SEL
I've been trying to find the proper torque to use on the Denso IK27 spark plugs in my Lycoming 363i from CubCrafters (essentially an IO-360). I read somewhere a year ago 15 ft-lbs and am trying to find my resource but also at the last condition inspection done as owner assisted the A&P also confirmed 15 ft-lbs. But I want to verify so if anyone knows the info please let me know.

I looked up the plug at the link below and in the specs it shows the torque values so I think 15-22 is correct. Also FYI they are 14mm plugs.

Torque SpecsCast Iron: 26-30 lb. ft. Aluminum: 15-22 lb. ft.


I do change the plugs every year, even with lean while taxiing and LOP while flying my plugs still looked like crap. For FX-3's like mine they are cheap at $10/plug. Amazon seems to be the best place to get them and I carry two spares in the plane as well.

Amazon product ASIN B000CIY4FM
 

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