TRNW-2: 2018 Lincoln Aviator Catalytic Converter Nut Size

[Glenn Pattison]

I don't know for sure, but it looks like EP style nut. 1 pic is of 17mm 12pt and 20EPL socket for reference. Hth



Glenn Pattison
B&M Transmission

Say what you do, do what you say, and make sure your words and actions match!



-------- Original message --------
From: "tucker tuckertrans.com via trnw2" <trnw2 at trnw.net>
Date: 2025-09-15 12:28 p.m. (GMT-08:00)
To: Technical Discussion Forum <trnw2 at trnw.net>
Subject: TRNW-2: 2018 Lincoln Aviator Catalytic Converter Nut Size

Group
 Does anytime know the exact size of the nuts that hold the catalyst converter nuts to the manifold?  It is the 'E' type nut 6 point but we tried an E22 and it fits a little loose.  We used a 17mm 12 point to get them out but man oh man they were tight and we want to have the right tool next time.  I don't like using a 12 point socket.
Maybe it is an E 22.  I don't know.  I do know rounding it off would be a bummer.
Dan Tucker

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