Detroit 671

Lets start with what you have.
671TI, 671TIB? Hours and when did this start?
What color is your exhaust? Engines come up to speed?
Do you have an air box drain? Capture can? What's in it?
How 'bout crank pressure, valve cover vent blowing lots of oil mist?
Turbo, Blower seals, Rings could be candidates.
The more we know, the better we can help.
,rc

Are they any real mechanics in your area?
Or at least somebody that understands a little about Detroits?

The first can I can think of is the air box drain. If it's full, it may blow oil and oil may back up in the air box.
But 1 qt a hour is not good.
Next can could be the Air-Sep system. But I'm still guessing here.
A picture would help and a pic of the mod.

When we find you a mechanic, the air box drain needs to be checked for excessive oil. That may help determine if it's blower or turbo oil seals. I am feared the side covers need to come off and the piston rings examined.

One of the Post kids had some blower work just done and he may have some comments to share. I think that was internal oil leaking related.

I'm just getting the hang of getting the picture size down myself. Using a photo editor, you have to change the stretch/skew or properties down to no more than 640 pixels wide.

Or, I'm going to send you a direct message thru the system. It will include my direct e-mail address. Send the pictures to my direct address, I can resize them and post them.

We received the pictures, downsizes them to 25%.

It looks like a remote crank vent bottle. Old Racor (or like) stuff.
Crankcase pressure and fumes would normally blow thru this and back into the air filter. Gelled oil would be reclaimed and deposed of.
The other lines would be air box drains.
Newer crank vents would return the oil. With air box slobber, you don't want this oil reused.
Has anybody serviced these bottles (cans)? Drain or pour the oil out of them?

The guy you had bypass it, probably directly connected the crank hose to the air inlet, it would then be consumed and then out the exhaust.
Question;;;; Was the exhaust blue before this mod? Probably not.
You have some crank case pressure issues.

What oil (brand, weight, API rating) is in the engine?

That's Rotella T1, with an API CF-2 in a 40W?

I suspect a washed cylinder or two resulting in some excessive crank case blow by. Lets clean up that crank vent, get an oil sample sent in to an oil lab and give our forum a chance to check in. Some of these kids are on the other side of the world (and then some).. Then some have a real job and it takes longer to check in.
In the mean time, you may need to start some looking into a real Detroit mechanic or a dealer.
2-stroke Detroits have only been around for over 70+ years. Gotta be an ole Detroit fart in your area.

A NAPA store can sell you what I use. Part number 75118. This is CF-2/40w approved oil.

As I stated earlier, there are inspection covers that allow checking the piston and rings, watching the air box drains is also a good indicator.
This will take a few hours but will offer a better guide as to whats really going on.

When you know whats really going on, then it can be fixed smartly.

Always get any activity in writing from a reputable shop.