Question: D4 7U Oil Cooler

Best to fit a loop pipe. The fitting threads appear to be UNF as in a bolt thread.

..or plug the outlet/inlet with pipe plugs to suit and remove the bypass valve and spring located in the filter base accessed via the large nut.

There was a LONG thread on this subject about 3(?) years ago. Most photo's have probably been removed. These two fellows are correct in that there are two ways to repair this. As you are planning an attempt to repair later, I agree with the "Loop" method as being the easiest for you!

its steel and rusted thru, don't repair, u don't need it anyway.

I really appreciate the great help / clarification from you guys on dealing with my d4 oil cooler leakage!

All the best,
dan

Hi , just look at pic 3 on cat d8 , just above this thread and you see the solution . This was done on many engines and lasted for ever .
Have a nice day , johan7

Get a couple of dash10 Oring Face Seal plugs from your local hydraulics store. Slip a #116 oring up to the shoulder, add your preferred thread sealer and forget about the oil cooler. Do remember to remove the oil cooler bypass plunger and spring from the bottom of the filter housing.

+1, no nasty looking hoses or kinked looped lines is best way

+1, no nasty looking hoses or kinked looped lines is best way