Engine oil cooler F-134 - plumbing question...

On my Jeep, I have an engine oil cooler mounted in the top of the grille shell in front of the radiator. Of course, I took the whole thing apart in 2008, and didn't mark where the oil lines were connected to.....

I have the canister type filter housing mounted to the firewall, and I am attempting to replace all the oil lines.
As far as I can tell, originally, there is a pressure line from the oil gallery plug beside the fuel pump that runs to the "inlet" port on the side of the canister, then the "output" line at the bottom of the housing goes to the fitting on the timing cover, where the oil drains back into the pan.

Should I plumb it so the pressurized oil goes to the cooler first, then the canister, and then the timing cover (this makes the most sense to me), or should I run the lines to the canister, then the cooler and back to the timing cover?

I do plan on being able to operate the Jeep in the winter here ( -20 to -30 Celsius ) if needed......
Thanks in advance!
Chris

 

I'm thinking after the cannister, only because there would be less pressure on the cooler, and less oil loss if it failed.

Do you really need a cooler? Will it be bypassed in cold weather? Cold oil is not always a good thing.

 

The cooler was already installed and plumbed by a previous owner - I never had any issues with it in the cold - at least, not that I can remember.......

 

Honestly, neither am I, but it was plumbed in before I pulled the motor - I think for now, I am going to just run the original route - oil gallery to inlet, outlet to timing cover - If I *need* to, I can always hook up the cooler later.......

 

OK. I hit a bit of a snag with this plan..... I removed the filter canister and brought it to work (to use the parts washer). After I got all of the sludge cleaned out, I took a closer look at the inside. Somebody drilled a hole in the center tube, opposite and above the original 0.050" hole, but much larger - slightly smaller than 1/4". It appears the hole was drilled through the 'inlet' hole in the canister.
I am fairly concerned that this will contribute to oil pressure problems....

 

you could always insert a reducing bushing with the right size hole into the bigger one.