lurk520

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nemanjaguitar

I now this a super old thread, but I need your help guys...
can anyone tell me if it's safe to use a heater hose in place of the CCV tube? I am talking about the one that is closer to the firewall, the one that gets the gasses into the manifold.
It is normally plastic, or stainless, but mine broke and I was thinking to just clamp on some radiator/heater hose and run it like that. I made sure the seals are tight, but what I wonder is whether the hose will be heavy duty enough? I don't wanna see it melt or something.... Please help!

Thanks

BotakBeng

This might interest you.

GL

dukie564

You can't do what the previous poster said on the rear fitting.

They are plastic. But seriously just go to the dealer and pick another set up. They come with new end connectors also. <$20.

iwheeljeepxj

i wanna punch you all in the face because i am so confused half you say theres a pcv valve others say they don't call it a pvc valve and other say theres no such thing as a pcv valve. and i thought this forum was suppose to help me not confuse the shet out of me.

freegdr

there are pvc valves just jeeps dont have them.the tiny hose on the rear of the valve cover renoves crank case pressure at idle with vacuum. the bigger hose in the front of the valve cover removes crank case pressure when off idle when there no vacuum .its that simple you can call the any thing you please they still do the same thing...simple enough.........

Snowbucks

They don't. I went through this on mine - NO PVC...just a hose/line...no valve.

iwheeljeepxj

Weird because the 92 that im working on. The front at a parts store is called a pcv elbow and all the parts stors around hear say the back one doesnt exsist and so we called the jeep dealership and the parts guy knew exsactly what we were talking about but wont have it till tues. So when we get it ill kno what it's called.

dukie564

the front elbow is just that, an open elbow, no valve, nothing
the rear elbow has no valve, it has a small hole in one end that only lets a certain amount of gases though constantly - it's proper name is the "CCV Fitting" - "CCV" stands for "constant crankcase ventilation"

hope this makes you un-confused.

a lot of parts stores label them incorrectly - it's a system unique to jeeps

Evil Drew M

You have absolutely no idea what you are talking about.

Anyone have the part number for the front elbow? You can get the rear orifice elbow and grommets in the Dorman/Help stuff in any auto parts store but the front elbow is non-existent and looking on the various Mopar parts websites they don't even list the part.

I'm about to go buy another orifice elbow for $5 and drill it out but figured I'd give this a shot first. I called my local dealer and some woman answered. I asked her and her response was "Dem 4 point ohs don' have a PCV valve". Thanks lady - that isn't what I asked. I called back 2 more times and she kept answering so I gave up.

dukie564

I'll almost guarantee you the rear orifice elbow you found does not have the correct hole size. This is a dealer only part in my experience. Part # 53030945

Front elbow part # is 53030991

Grommets (front and rear) part # 2946079

This should help:
http://www.jeepforum.com/forum/f310/...ite-up-733669/

1991Jeep_Man

Honestly, I am thinking of making a thread about these common mis-understood part names for XJ's and their 4.0's. I mean, Im not trying to sound like a jerk, but I have seen many threads (including some of my own) with questions about very difficult problems be moved to the next page with these simple questions. This question has been covered a million times, and the search button can be your best friend and help avoid a flame.

As stated, the 4.0 does not use a positive crankcase vent system (PCV) which basically only releases 'pressure' when it is above constant. The 4.0 uses Constant Crankcase Ventiliation, meaning air is always availible to the crankcase. Ergo, the front grommet connected to the air box and the rear grommet to the intake. I have seen people toss in CAI's without modifying it to accept the front hose and just leave the hose dangling. This is very stupid. Also, blowby out of the front tube is very common. This can either be clogged hoses, clogged grommets, or the orifaces inside the Valve Cover may be clogged themselves. It could even be as bad as old worn rings. Either way, if replacing/cleaning the 'Easy 3' as I call them doesn't help, you can always install a 'catch can' along the front line to collect oil.

Evil Drew M

You are right - the rear is the orifice elbow ie: the one with the really small hole which is why I said I was going to drill it out.

The front elbow is straight through with no form of metering/orifice/checkvalve/etc in it so there is no negative to drilling a rear out other than it isn't the original part.

Grommets have a Dorman/Help part number. I've already installed the 2 grommets and rear orifice elbow.

dukie564

i understood your plan. I was saying the the part had the wrong hole size for the rear (just in case you were replacing that part as well)

Evil Drew M

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