PCV/CCV Valve Question 4.0 - Page 2

GuidedByVoices · 02-18-2009, 12:00 PM

Hey guys. New to this forum but joined after reading some great advice. Approaching 100K on my Sport and just doing so simple maint. She idles a little hard sometimes. Harder in drive than Park... I replaced the front CCV elbow (after cracking it trying to remove) and hose and now have a question...the elbow piece into the crank, sorta sits there a little loose. In no means does it want to "pop" out, however in does rattle in the spot a little with some up and down motion. Anyone know if there is supposed to be some kind of sealer put on first? Same question goes for the rear one closer to the firewall. I want to take that out and clean it as well.

georged · 02-19-2009, 05:56 AM

Can the PCC valve be cleaned with solvent - throttle body cleaner - from the outside without removing it from the valve cover? Will a pipe cleaner with solvent fit through from outside and get through the orfice with doing damage?

xplodn · 02-27-2010, 08:28 AM

Did anyone else have a very pronounced vacuum noise after doing this? I did it on my TJ and now I can hear it over the intake and exhaust now....

bigbill888 · 02-27-2010, 10:31 AM

The milky stuff in the front line is condensed water vapor/oil vapor/blow-by gases. It is there because your crankcase ventilation is going backwards because your orifice in the back of the valve cover is plugged and blow-by gas is pressurizing your crankcase a little. Once you clean that orifice and the associated line out, the milk will go away. You should be able to clean it up good as new and not replace it (if you got it out of valve cover ok)

melk · 02-27-2010, 10:50 AM

1996 4.0 with 100k

My grommets looked ok, hard but not super brittle. Pulled my rear off, took a while, but twisting and pulling finally got it off.

Sprayed it with throttle body cleaner, which wasn't really needed since I could blow air through it. It did harden up the grommets though, and I couldn't get it back on. Bought a new generic grommet from Oreillys for like $2 bucks.

So... I'm not sure what you should clean rubber with, but I don't think throttle body cleaner is the best.

I want to take the valve cover off soon just to inspect and clean it up. I'm probably going to put a small breather on the front to replace the hose that siphons off from the air intake.

wsar10 · 02-27-2010, 11:07 AM

Quote:

Originally Posted by GuidedByVoices

Hey guys. New to this forum but joined after reading some great advice. Approaching 100K on my Sport and just doing so simple maint. She idles a little hard sometimes. Harder in drive than Park... I replaced the front CCV elbow (after cracking it trying to remove) and hose and now have a question...the elbow piece into the crank, sorta sits there a little loose. In no means does it want to "pop" out, however in does rattle in the spot a little with some up and down motion. Anyone know if there is supposed to be some kind of sealer put on first? Same question goes for the rear one closer to the firewall. I want to take that out and clean it as well.

mine on either jeep dont sit very tight i can kinda wiggle them around slightly so i think its ok,
i wouldnt clean these things just replace them i think the PCV on my ZJ was 4 bucks, if you get the PCV out of your valve cover and it rattles when you shake it and you can blow through it one way but not the other than its working its not much more than a check valve.

tepantita · 08-25-2010, 10:14 AM

Hi fellas im from tijuana mexico, and last weekend try to clean ccv (front) and broke it.
Where can i found it? may jeep dealer? may junk yard?

My XJ is an 4.0 96 sport. Thank's a lot and see you.

wjcando · 09-07-2010, 07:00 PM

I only got to the front elbow... it cracked off. Tried some WD40 and needle nose pliers. That only broke off more plastic. Any advice on what to do now? If I keep taking off pieces, can I eventually get the grommet and everything out? What's going to end up inside the valve cover? Thanks.

melk · 09-07-2010, 07:09 PM

I'd work on the rubber grommet instead. You'll want to replace it anyway so it won't matter if it gets chewed up. Theres a decent chance that if you can work it loose you can get both pieces at once, rather than slowly breaking off pieces of the elbow.

I bought a replacement grommet from the autoparts store for like $2. I put on a breather filter rather than hook it back up to the airbox though, which allows you to ditch that tube and really help clean up the look of the engine bay, plus the breather looks much cooler too

iPlay1515 · 09-07-2010, 08:01 PM

So is it correct then that filtered air enters the valve cover / crankcase via the front hose and the crankcase gases are pulled into the intake manifold through the rear hose and a small orifice??

When the rear orifice gets plugged, the oily crankcase gas is forced into the air filter through the front hose??

georged · 09-08-2010, 05:40 AM

If the rear exhaust line gets pluged it builds up some pressure and the bad oil/gas stays in the endine and can blow engine seals.
Try two screw drivers to get the gromet up and maybe someone else with needle pliers to pull it out. I like the idea of a breather on the front inlet. Did you use gromet to hold it in? Also where did you get the breather and its size?

iPlay1515 · 09-08-2010, 06:27 AM

Quote:

Originally Posted by georged

If the rear exhaust line gets pluged it builds up some pressure and the bad oil/gas stays in the endine and can blow engine seals.
Try two screw drivers to get the gromet up and maybe someone else with needle pliers to pull it out. I like the idea of a breather on the front inlet. Did you use gromet to hold it in? Also where did you get the breather and its size?

I don't understand how it builds up pressure if the front hose doesn't have a check valve. It would seem that any pressure would vent to the air filter. The diagram in the manual doesn't show a check valve in the front vent, but the manual has been wrong before.

melk · 09-08-2010, 07:05 AM

K&N breather, $12 from Amazon

That one turned out to be a little big for my taste so I replaced it with a smaller one. This is the only pic I have at the moment however.

iPlay1515 · 09-08-2010, 07:24 AM

Sweet.

Where did you purchase the smaller one?

**Marcos** · 09-08-2010, 07:29 AM

Something I didn't see mentioned was to clean the metal nipple on the intake manifold where the line from the rear 90* elbow connects to. I have a '93 with 150+K on it and have taken the rear elbow off several times for cleaning and never found any buildup on the orifice, but when I first got the Jeep (used) the metal nipple on the intake manifold was nearly plugged up.

08-25-2010, 10:14 AM	#22
tepantita Registered User Join Date: Mar 2009 Location: tijuana Posts: 6 Profile Gallery Classifieds My Jeeps	hard to find ccv valve? Hi fellas im from tijuana mexico, and last weekend try to clean ccv (front) and broke it. Where can i found it? may jeep dealer? may junk yard? My XJ is an 4.0 96 sport. Thank's a lot and see you.