Oil Catch Can Install

[Willys41]

So Willys41 do you have a PN for the new pcv ?

I be leave its 68210345AC.
I measured the oil from the catch can before and after the new pcv valve and there was no difference in the amount of oil it collected.

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[Willys41]

If you really have a oil related pre-ignition problem, there is too much blow-by and you have a serious engine health issue. That said, if you need to get more oil vapor out of your PCV output, installing an air-oil separator like the Mann-Hummel ProVent type is going to remove more oil vapor. The difference between a "hot rod" or "racing" catch-can and a production intended air-oil separator is that the latter is that it incorporates a self draining feature, often is much higher volume to expand and condense the vapor, and often has a filter membrane to catch more oil vapor.

The opposing view from members here, of a catch-can on our jeeps, is based on that blown engine thread reference where it's believed the catch-can had accumulated a significant amount of oil from very steep maneuvers, then the contents of the catch-can was ingested in a high rate, and caused a hydraulic lock in the cylinders.

I'm getting ready to install a Teraflex Crankcase Breather check valve system to prevent that type of event. I can see where a catch-can or M-H ProVent type separator could be incorporated in this setup.

If what you are saying ( too much blow-by) Than all the 3.6 have too much blow-by.
Its not just the 3.6 There are other engine manufactures that have an poor PCV system.
Some Ford engines for example.

TSB 09-012-22
https://www.jlwranglerforums.com/fo...r-3-6-for-spark-knock-and-misfire-cel.108824/

 

[roaniecowpony]

I will probably be switching to that oil too. The last time I took my used oil in for recycling, the guy who dumped it in the tank said that was noticeably the thinnest oil he had seen. 0w-20 oil from my wife’s Subaru.

The viscosity when cold will be misleading as to its operating temperature viscosity. A 0w20 and a 0w40 could have the same apparent viscosity when cold, but be much different at 100C.

 

[Willys41]

The viscosity when cold will be misleading as to its operating temperature viscosity. A 0w20 and a 0w40 could have the same apparent viscosity when cold, but be much different at 100C.

That correct.
I have seen no oil pressure difference between 5w30 and 5w40 put I would think that the higher viscosity when hot can only help the valve train.

 

[roaniecowpony]

If what you are saying ( too much blow-by) Than all the 3.6 have too much blow-by.
Its not just the 3.6 There are other engine manufactures that have an poor PCV system.
Some Ford engines for example.

TSB 09-012-22
https://www.jlwranglerforums.com/fo...r-3-6-for-spark-knock-and-misfire-cel.108824/

Larry, I haven't had a pre-ignition issue with my 3.6L. When I had the intake manifolds off for recent work, the ports and backsides of the intake valves looked pretty clean. As with any engine with a PCV system, it will have some oil film in the intake. It only has about 33,000 miles on it.

 

[roaniecowpony]

That correct.
I have seen no oil pressure difference between 5w30 and 5w40 put I would think that the higher viscosity when hot can only help the valve train.

I wouldn't expect the oil pressure to change except possibly a very slight amount when the oil is hot at idle, when pressure can drop below the relief spring setting. Agree on the higher viscosity for valvetrain.

 

[Willys41]

Larry, I haven't had a pre-ignition issue with my 3.6L. When I had the intake manifolds off for recent work, the ports and backsides of the intake valves looked pretty clean. As with any engine with a PCV system, it will have some oil film in the intake. It only has about 33,000 miles on it.

I can only state what I have seen on mine and others.
It is a problem. maybe with PCV system or the oil centrifugal oil slinger at the back of the cam where the PCV valve is located.

 

[Dusty Dude]

The viscosity when cold will be misleading as to its operating temperature viscosity. A 0w20 and a 0w40 could have the same apparent viscosity when cold, but be much different at 100C.

Agreed. My reasoning for changing was for the viscosity when hot. IMHO, xW-20 is too light of an oil. Especially if the engine gets above normal operating temperature for any short period of time.

 

[BEJEEP]

If you saw the amount of oil that dumps out of a 3.6 intake everyday you might reconsider lol

Yup, what he said^^^^^ Almost filled the canister with 3,500 miles.…….

 

[roaniecowpony]

Agreed. My reasoning for changing was for the viscosity when hot. IMHO, xW-20 is too light of an oil. Especially if the engine gets above normal operating temperature for any short period of time.

I currently have a fill of 5w30 M1 EP in the sump after multiple flushes from coolant contamination by way of the oil cooler seals. I'll put in 0w40 if my last UOA comes back good.

 

[Heimkehr]

If your dealership is kicking your warranty due to a oil catch can then you have a shitty dealership point blank.

Lousy CDJR dealerships aren't unknown to this community. Our wariness regarding engine modifications is earned.

 

[PotterJLUR]

Replace your PCV. That's not normal at all.

I also realized you just recommended me to change my PCV valve on a 2024 with 300 miles on the engine lol

 

[alphawolff]

I also realized you just recommended me to change my PCV valve on a 2024 with 300 miles on the engine lol

There's no shot a 2024 is dumping oil into the intake like that, surely?

I was talking about the others who mentioned it

 

[PotterJLUR]

There's no shot a 2024 is dumping oil into the intake like that, surely?

I was talking about the others who mentioned it

I installed the catch can the first day I drove the jeep home and only have 300 miles on the odometer and am already collecting oil in the catch can.

 

[alphawolff]

I installed the catch can the first day I drove the jeep home and only have 300 miles on the odometer and am already collecting oil in the catch can.

That is insane and not normal. Then again, I'm not surprised with how the 3.6l build quality has been these last few years. Pacificas & WLs are blowing hadgaskets right at 50-60k miles like clockwork. Fortunately haven't seen many wranglers with that issue

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