Bypass Crank Case Lubricating Oil System

You can't just blank them off as it stops the oil circulation.
Do a search for oil cooler lines and filter change overs on here as this was just brought up on a D4 last month so the info is available to explain what and how to do that.
The easiest way is to take the lines from the filter to the oil cooler and interconnect them so the oil comes out of the filter and returns right back in.

Your talking about three different events here.
The conversion from partial flow (bypass) filtration to full flow filtration using the conversion kit has nothing to do with bypassing the oil cooler.

There are two options for bypassing the cooler. You can rig a bypass loop connection....tubing or hose at the filter base.
or
You can plug the ports directly. If you just plug them it is a good idea to remove the oil cooler bypass valve/plunger from the bottom of the filter housing (under the two bolt plate)

Be aware that the ports are straight thread pipe, 1 inch 14 tpi (not tapered)
Overtightening tapered pipe plugs in these port can crack the housing so beware.

I have recently started using o-ring face seal plugs with an o-ring installed similar to and o-ring boss fitting. The OFS plug is a -10 size with the 1-14 thread.

OldMagnet.... do you happen to have a part number for the face seal plug ???? I've searched on McMaster-Carr and can't find it. Thanks, Wayne

Hi Wayne,
McMaster is pretty limited on hydraulic fittings......and your not likely to find them in our area unless you know of a good hydraulics house.

O-Ring Face Seal (OFS) dash 10 (-10) size

SAE #520109
Aeroquip FF9767
Parker PNLO
Weatherhead 4229

I get all my hydraulic & hose fittings here
www.discounthydraulichose.com

Their part number is a FS2408-10

Don't forget to add an o-ring to the outside that makes it sort of an 0-ring boss fitting. Discard the face seal if your not using it.