Jeep 4.0 LITER Crankcase Vent Problems. CJ, YJ, XJ, ZJ, WJ, TJ, 4.2, 4.0, 2.5 6cyl / 4cyl 

Either way ( CCV or PCV) they do the same thing. It’s not that big of a deal… well, until you get to the parts counter and the guy tapping on the keys can’t find the part because he’s looking for PCV valve. Part names do matter, but these two do essentially the same thing. 🤙 But I got another one for ya 😁 Is it a distribution block or a proportioning valve! 😄

@@Ikillintel1 front / rear is prop valve. left / right is distro block

Just had this convo on 3 differend parts stores. And they kept looking for a pcv... I spelled it ten times... Eventually got the old one cleaned out....

so the 89 4.2 the front is pcv and the rear is ccv?

@@jchiopsj8932 thats how it was on mine and worked good. I reckon there might be somekind of baffle in one if them but it shouldnt nake a difference which way you put them as long as the ccv goes to aircleaner and pcv to intake or carb (if im wrong please correct me I dont get a hissyfit)

Thanks for sharing

When you changed those valves did the rear one come with that formed plastic tube?

where did you get them? I can only find them on amazon

Thank you for the kind words

@@superb60ce 🇺🇸🇺🇸🇺🇸💪💪💪💥💥💥⚡⚡⚡🏁🏁🏁

Glad it was helpful!

Glad to help

Glad to help

Would you happen to have the part numbers or know the correct name for those pieces?

Same. I had to cut the absolute bejeezuss outta' mine, and luckily managed somehow not to get any of the hardened chunks down inside my valve cover.

​@@Dayton504 I think they are referred to as crankcase vent valve by a lot of parts places. I have been trying for a few years to find them because I referred to them as CCV valves & nobody could find them. My boyfriend finally saw them on a site as mentioned above.

Glad it helped

Guess it is time for an updated video on this topic

Happy to help

Glad to help

No problem 👍

You're Welcome

Glad to help

Glad to help

@@superb60ce how come my 2.5l valve cover has two ports on top?

@@Dabestshindig what year?

@@superb60ce 1987

@@Dabestshindig Carry over from the original 4.2l derived 2.5l 4cyl. You have PCV system

1/4 inch might be a little too large, but I see where you are going with this

Glad to help

Just use some patience when removing the seals...they will be petrified

Glad I could help

We’re does the line run or does it have a line the metered Orphice?

Thank you!

Yup

I would also recommend updating the 95 with a 96 or later valve cover...mush better oil baffle system

The 4.2 uses a different setup for the pcv/ccv system....just be aware

Update… I took the valve on the side of the valve cover out… plugged solid. I cleaned it and now the top hose connected to the air box has a vacuum draw instead of blowing oil into my air cleaner. Problem solved… Thank you sir!

Good stuff

Thanks

Yes they will overpressure, the fat line can mitigate it, but I have found that by doing old school PCV maintenance, IE replacing the orifices every 50k miles or so as well as the aft line, I have no problems

Best bet is to convert to a 96 or later valve cover,,,it has a better oil baffle system anyway

@@superb60ce yeah I’ll probably just grab one from you pull mines pretty charred anyway thanks for the advice good video

Glad it was helpful!

Glad it helped

Remove the valve cover, then remove the oil baffles from the inside of the cover and clean them. Re-install everything and use new PCV / CCV valves

It is common

No problem 👍

Glad you are trying to save it

It could, or you may just need to replace the rubber ringed filler cap (never liked that design)

Good luck!

Patience

If the filter is not getting oil soaked...drive on

@@superb60ce cool thank you.

Yes it should

@@superb60ce Thank you superb60ce, I'll get them then...

You probably have a blocked evap line from the tank to the charcoal canister. Find a local shop to confirm

location?

That is correct

@@superb60ce Thank you, I kept shaking it waiting to hear a rattle.🤣

Not an expert on Grand Cherokee Transmissions, but I recommend you get yours checked

If the leak is bad enough, then yes

Yes. Put the can between the air box and the front port

@@superb60ce Thanks my friend, I can work with that ;-)

Rock auto and search for PCv under emissions system

Year?? I recommend converting earlier models to the late model steel valve cover, much better oil baffle and a better gasket design

This is the one that is metered www.autozone.com/emission-control-and-exhaust/pcv-valve-elbow/p/dorman-pcv-valve-elbow-47057/860943_0_0

yes

I don't know the part numbers off hand, in many cases, I have just scrolled Rock Auto looking at all 4.0 HO engined Jeeps till I find what works

Not sure

The same on my 87 2.5 pvc valve in front and canister on rear.

Well, that is an easy one to spot...leaks oil, replace it

There is a vacuum reservoir behind the front bumper, check from there all the way back to the engine for leaks...I will be doing the same when I install my new engine later this year.

@@superb60ce Thanks. I found out about that canister a few years back. It's always the first thing I check. My whole vacuum line deteriorated so badly that I recently replaced the whole line with a new one. Air blows great now from the dash vents until I push down on the skinny pedal and put some load on the engine. Then the air goes from dash vents to defrost. I saw your video and thought maybe the CCV is starving the vacuum when I load up the 4.0. What do you think? Could the CCV be partially plugged or maybe the rubber grommet is dried and cracked? I do seem to get oily residue around both ports on the valve cover.

@@bluemaltese1 check the check valve at the intake. Other than that, re check all the lines. I am chasing the same issue, could also be tired motor.

@@superb60ce I replaced the rubber ends on the PCV (CCV) tube from the valve cover to the intake manifold and it fixed my problem. I now have good air flow from my dash vents even when I put the 4.0 6 cyl under load climbing a hill. My rubber ends were dried and cracked. It only cost less than $8 and took 10 minutes. Part # 47128. I have pictures but don't know how to attach them.

I change my plugs now I am hear popping noise and engine shake when I shut it off. Any help.

Glad it was helpful!

RockAuto search under 95 wrangler exhaust and emissions system pcv hose. front is w/o orifice rear is w orifice

Not sure if you typed that correctly. I would never recommend that long of an oil change interval

@@superb60ce Oh I typed that correctly. We used to ride these babies for MILES. Seeing if I can stretch this to 50K and beyond

You have the RENIX injection which used a different vacuum system. These are the parts you need. www.rockauto.com/en/moreinfo.php?pk=586586&cc=1179996&pt=11784&jsn=1046 www.rockauto.com/en/moreinfo.php?pk=14900&cc=1179996&pt=11785&jsn=1039

Good luck, try a pick-a-pull

Two separate systems.

That's part of the EVAP system.

The open vent (line that rins to aircleaner) could be replaced with push on filter breather

@@superb60ce thanks for the reply!

shop.advanceautoparts.com/p/carquest-pcv-valve-pcv574/10015456-P?searchTerm=pcv

Yes, the earlier cast aluminum valve cover oil baffles should be cleaned if they are clogged.

That sounds about right

@@superb60ce thanks!!

Assuming it isn't stuck

@@shiftyguy_1146 It is stuck, you WILL destroy it to remove it

Which tube

Glad you enjoyed it

Probably not. I suspect your 2.5 is burning oil because the rings are shot.

@@superb60ce that’s fine, I have a rebuild kit on the way anyway, I’m sitting at 350,000 miles, so that’s not surprising

The 2.5s suck to work on because of lack of support. All I can say, is find a competent mechanic that can cobble something together to make it work

Can i put a catch can on that hose

@@user-jq2nr2tr2k dont see why not

You could but that will create a stinky garage....plenty of older, pre emissions control cars just had breathers on the valve cover.

Rear is small orifice

@@superb60ce thank you. So I need 2 of the same type (small orifices). Correct?

@@puddlesmacker No, Small orifice in the rear. Large (no orifice) in the front

@@superb60ce ok...thanks for clearing that up. Be swapping them out shortly

Yes, run a FATS (hose around the engine) from the front port and put a catch can between it and the air filter box.

@@superb60ce Thanks for reply. Using front vent for FATS should work in majority the rolls that are nose down when upside down, what about when Jeep upside down level or leaning towards rear? The rear metered valve will flow oil (slowly but will leak) I'm thinking two separate FATS, the rear is still connected in the same two locations but just do FATS loop in between around the engine??

The rear valve cover vent would be more likely to fill the intake manifold (when upside down) & cause hydrolock if plugs weren't pulled/cleared before startup.

best bet is to upgrade to the later valve cover

Quadratec has it, Crown Automotive 53030492 Rear PCV Valve Elbow for 91-93 Jeep Wrangler YJ, Cherokee XJ, with 4.0L Engine

@@ibberman thank you!

Hey, no making fun of my accent...lol

They are separate, unrelated systems.

Why, the factory systems work great, and keep everything (water) out of the engine except filtered air.

If you are blowing it out of the dipstick, the crank case is over pressurized. I would replace the CCV ports and hoses

Should be two vents on the valve cover, one of them is the metered orifice.

On a 4.0, the rear port does

@@superb60ce what will happen if I installed metered elbow up front and one is on back also

@@robpaul7900 The crankcase will not vent properly

I assume you are referring to the side vent on the 4cyl valve cover. I goes to a vacuum port on the intake manifold.

@@superb60ce thanks man

Great suggestion!

you are partly correct....most piston slap and stuck ring issues (in ALL cars) result from improper oil service intervals and / or low quality oil. I have owned jeeps w 4.0l engines since 1993....I have NEVER had piston slap or stuck ring issues.

Try tightening your torque converter bolts. That might be your so-called piston slap noise.

Depends on the year and emissions package, I would consult your service manual

@@superb60ce i took off the emissions. Not sure the year of the engine, the previous owner replaced the 2.5 with the current 4.2

Nope

@@superb60ce is it bad to do?

@@highwayxj9397 It will make for a stinky engine bay

@@superb60ce you’re a stinky engine bay!

The physical replacement of the metered orifice?

welcome

The 89 Cherokee 4.0 was a Renix and used a different PCV system

@@superb60ce gotcha.. I am getting oil into the air box and my setup looks similar to this one.

I would start with the valve cover vents as discussed in this video. The crank is over pressurized probably because your vents are old and blocked.

Awesome video thank you. I have some common sense and was left scratching my head when I went to a mechanic and asked for a diagnosis. He explained that I needed to have my old engine rebuild or replaced. 92 Cherokee with an old engine and very low mileage . He never even checked the mileage.

the part numbers vary but the best bet is to check on rock auto. the front is wo orifices the rear with. Rear OEM / Interchange Numbers: 53030495, Front OEM / Interchange Numbers: 53030497

No, only the rear vent is metered.

Front www.rockauto.com/en/moreinfo.php?pk=1320609&cc=1180314&pt=5052&jsn=1011&_nck=HllVxRCey1%2B2aVRDo41oQXhbegy63eH0PchVaGVs1k%2BAll0%2F%2F7FZXjBdldY0BurSU4nxEEcYmFKe35qT58jQ3b%2BhkYx21EuBgQ9FAP%2BRj3QDI%2BSBMINrOaO1V3GRPjCLGkRHH8rSLMdTjkEX4pgs3zTWT%2BA5hjNVLeez44dZuPrkveq9Jnp8wJLmODnNaXCenSNDRppfGESlIh9BZ98I1U1hgJpzOiZ1pV%2BqLjXHtKKk5aGYVIjmSga0IQmwn8p78kbMfyGDq6q08sigFbKns8JtUG8tYklZHD6CeCNCJMggDqjytOe59XfL8DctTweV Rear www.rockauto.com/en/moreinfo.php?pk=12490837&cc=1180314&pt=11784&jsn=1004&_nck=HllVxRCey1%2B2aVRDo41oQXhbegy63eH0PchVaGVs1k%2BAll0%2F%2F7FZXjBdldY0BurSU4nxEEcYmFKe35qT58jQ3b%2BhkYx21EuBgQ9FAP%2BRj3QDI%2BSBMINrOaO1V3GRPjCLGkRHH8rSLMdTjkEX4pgs3zTWT%2BA5hjNVLeez44dZuPrkveq9Jnp8wJLmODnNaXCenSNDRppfGESlIh9BZ98I1U1hgJpzOiZ1pV%2BqLjXHtKKk5aGYVIjmSga0IQmwn8p78kbMfyGDq6q08sigFbKns8JtUG8tYklZHD6CeCNCJMggDqjytOe59XfL8DctTweV Grommet www.rockauto.com/en/moreinfo.php?pk=13559737&cc=1180314&pt=11785&jsn=997&_nck=HllVxRCey1%2B2aVRDo41oQXhbegy63eH0PchVaGVs1k%2BAll0%2F%2F7FZXjBdldY0BurSU4nxEEcYmFKe35qT58jQ3b%2BhkYx21EuBgQ9FAP%2BRj3QDI%2BSBMINrOaO1V3GRPjCLGkRHH8rSLMdTjkEX4pgs3zTWT%2BA5hjNVLeez44dZuPrkveq9Jnp8wJLmODnNaXCenSNDRppfGESlIh9BZ98I1U1hgJpzOiZ1pV%2BqLjXHtKKk5aGYVIjmSga0IQmwn8p78kbMfyGDq6q08sigFbKns8JtUG8tYklZHD6CeCNCJMggDqjytOe59XfL8DctTweV

Thank you

Not really, and do you mean EVAP system?

If the vacuum port on the intake is left open, it will run lean

Would that be where the ccv goes to? This opening bought doesn't have any vaccum or evap lines left. I'm trying to find out where the all go..

@@davidvarnado7761 yes

Guess it is time for an updated video on this topic

@@superb60ce it’s my head gasket. I’m gonna have the head redone.

I’m just glad I caught right before it blew there’s water in my oil. I think it’s just beginning to spew.

@@alfred-mi2wt Have the head inspected, could be cracked

You're Welcome

ALL combustion engines will get some combustion blow by into the oil...dirty oil will smell a little gassy, question is how much is too much...do a compression check on your engine

@Super-B cylinder 1 is a little low but nothing that would really raise any flags. I think it couldn't hurt to replace the injectors and see what happens. I was curious of what you thought.

@@Mattmazz77 Probably have an injector sticking open and pumping too much gas on combustion stroke which is leaking down into the sump as the engine is unable to burn it. Check your injectors.

@Taylor Livingston that was my guess too. Thank you for your input.

You're Welcome