PCV catch can(oil separator)

muddingrodeo · Nov 2, 2020

So the last time I took the intake off on my trooper, I noticed that there was a lot of oil puddling up in the intake. I pressure washed the intake and made it look like new but it got me thinking. I wanted to install a oil catch can or find a way to reduce the oil vapor coming into the intake. What I installed was a 3/8" air compressor water air separator(9$ ebay) in line with the PCV system to try to reduce the oil build up in the intake. Now I know the PVC system is there for a reason but the oil is collecting in the intake or building up in the cats and possibly clogging up the exhaust. After the install and about 1500 miles in I peeked into the throttle body and I noticed that no oil had collected and the inside was dry. Now I did notice that the inside had a light coating of grey powder but I imagine that is the exhaust gases from the EGR system but overall it was 99 percent cleaner with no oil build up. Also since my catch can is clear I could see the amount of oil that it was catching and drain it out as needed. At first I had to drain it out every 100 miles or so but then the interval stared to increase to the point were I just need to drain it every 1000 miles.

Any input on this would be great.

itsmehb · Nov 3, 2020

I have the 2.6 engine in an 89 Trooper. I installed one after reading a post a while back where Dennis (DSUZU) was explaining why he had one installed. It will help prevent carbon build up on the valves as your removing some of the oil vapor before it gets to that point. I have one that has rough steel wool inside to help the separation process. I empty mine every few thousand miles. Seems to work well. I think it's a worthwhile addition.

muddingrodeo · Nov 3, 2020

I have one installed in all of my ISUZU's and even a high mileage lexus that has a lot of oil accumulation on the intake runners. Along with the engine flush with diesel it lets me visually inspect the amount of oil is being blown out or whipped up in the oil vapor.
I do not know if the diesel is getting to the rings to clean out the slug but it would seem to me that if I am getting less and less oil in the can I have to be reducing blow by.

DSUZU · Nov 4, 2020

Just to clarify: PVC = "polyvinyl conduit" (IIRC). We're talking about PCV (Positive Crankcase Ventilation). The system I made was made with a fuel sediment bowl. It worked. It would have worked better if I had put the steel wool in it. I hadn't installed the system yet after rebuilding my engine (there was much less blow-by, but I still planned on installing it). I believe ANY PCV system can benefit from a catch can between the PCV valve and the plenum chamber.
Way back (at work) we were having a lot of trouble with the early EFI systems in our Kawasaki Mules. They kept clogging up with carbon deposits from crankcase vapors (no PCV valves on these). We were constantly having to remove and clean the throttle bodies and re-calibrate them. I tried one unit with a large diameter (1/2") inline fuel filter between the crankcase vent and the air intake tube. It trapped enough of the "trash" to really improve things and that unit went much longer before needing cleaning. Dennis

muddingrodeo · Nov 4, 2020

You are correct sir, I need to put the whisky down when I log on the internet I guess.

PCV catch can(oil separator)

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