Name the size of this expansion port

Johns06yota

Johns06yota

Member
Having trouble finding the size of this expansion port below the oil filter housing on the 4.0. This would be used as an oil feed on my turbo build the eliminate the possibility of a sandwich adapter plate leak. If you know the size of this please let me know as I'm somewhat lost haha. Looking like a 3/4 or metric equivalent but don't want to pull it apart until I'm sure. Thanks!
 

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Possibly 18 x 1.5.

I'd just take that "plug" out, put it on a vise, and drill/tap a 1/8 NPT hole in it. Reinstall, then thread in a NPT-AN adapter, or have a hose shop put together a oil feed line with a male NPT fitting on one end and whatever thread/fitting your turbo's oil inlet uses on the other.
 
That would be either 3/8 NPT or 3/8 BSPT since it is an import. The oil feed on my turbo Eclipse is 3/8 BSPT, but able to accept a 3/8 NPT fitting without any leaks.
 
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