Lately I had couple of projects going on. Some info from this projects might be useful for some folks.
After I discovered water condensation in engine oil on my way from coast to coast I was wondering how to prevent this in the future.
First I want to add Frantz bypass oil filters using TP.
Second I will modify crankcase ventilation system. Instead of just just tube going down I will install oil trap with filter and route it into air filter, just like newer engines, but this will wait for some time.
One of the benefits of using TP bypass oil filters is their ability to absorb and keep water away from oil.
I was trying to get more info on how to connect bypass filters correctly but found almost nothing. There is a ton of info how to plumb 5.9 Cummins but 8.3 Cummins is not so common engine...
I had a small oil leak from engine oil cooler area, not even a leak but a bunch of dust build up there, so because my exhaust manifold was off there was a good chance to remove oil cooler fix the leak and see how oil system is plumbed.
Here are 2 plugs on oil cooler cover circled red and yellow. Cummins manual says this plugs are for checking oil filter performance, but it doesn't says which one is before filter and which one is after.
Now I know 100% bottom one (yellow circle) is before oil filter and top one (red circle) is after oil filter.
Here is another picture showing top circle is oil connection for turbo oil supply line (always after oil filter)
Here is another picture from the back:
And another one:
And one more:
BTW blue line is original Cummins oil bypass filter section drainage. It starts in the middle of the filter (next picture) and goes trough steel tube all the way to oil drain section which drains directly to oil pan(green area).
Original bypass circuit starts here (blue circle):
So, I ended up with something like this:
Red is oil valve after main oil filter for taking oil samples for oil analysis(just to make it clean and painless).
Yellow is oil before main oil filter goes to bypass oil filter.
Green return oil from bypass oil filter drains to oil pan. I drilled and tapped in green area(next picture)
Here I drilled and tapped 1/8" NPT hole for return oil line from bypass oil filter. This was possible because I had the cover off otherwise I would use drain plug on the side of the oil pan.