4.0L Valve Cover swap write up - JeepForum.com

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post #1 of 28 Old 04-02-2013, 07:21 PM Thread Starter
HaskiE
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4.0L Valve Cover swap write up

ok so this is pretty easy, but when I searched for it, I couldn't find it on here, so here goes my first write up.

I got most of my info from Drahcir's build on comancheclub.com
http://comancheclub.com/topic/7615-d...age-22/page-14

his engine is much cleaner than mine, so his might be a better write up in general over there, but here's my stab at it having done this on my beater YJ.

The older 4.0L's came with an aluminum valve cover with PCV & CCV towers,


and the newer ones got a all-steel valve cover with a full length baffle



I got mine off a Grand Cherokee at my local junk yard for ~$25

remember to keep all the bolts and steel sleeves!


from what I can tell, the baffle keeps the oil in the engine and lets the air out without getting oil in the intake, thus the point of this modification = cleaner air filter.

so step 1:
remove gunky old valve cover & clean off the old gasket & all your parts.


Note! Also remember where your PCV & CCV hoses hook up, you'll need the hoses for the new valve cover as they are larger in diameter.

step 2:
install new gasket
I told the guy at AdvancedAuto parts I needed one for a '96 cherokee, he gave me felpro part # VS 50522 T, you want the one with the rubber grommets!


step 3:
install rubber grommets on the valve cover

step 4:
install steel sleeves into grommets

step 5:
install on jeep!


step 6: torque to spec
(for me it was 55in*lbs)
spec:
http://www.jeepforum.com/forum/f12/y...ations-587412/

hook up PCV & CCV lines, one goes into the intake manifold next to the throttle, the other goes to the air-box.

step 7:


1992 YJ 1"Body Lift, Slip Yoke Eliminator & CV Driveshaft,
2.5" TJ exhaust, WJ valve cover, XJ Computer, External Slave Cyl AX15,
Durango Steeringbox, No track or sway bars, CJ tailgate, on 31's :)
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post #2 of 28 Old 01-18-2014, 02:32 PM
adammannis
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Just exactly what I was looking for. Thanks for the post

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post #3 of 28 Old 01-18-2014, 06:45 PM
jsawduste
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Interesting.
Did not know there was a difference in the oil baffling. Found one on CL for 20 bucks. Going to pick it up tomorrow.

The "newer" design would appear to be a better engineered set up.

Thanks
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post #4 of 28 Old 01-18-2014, 07:01 PM
bigbossd1030
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Bumped for future reference.

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post #5 of 28 Old 01-19-2014, 09:45 AM
Louie4
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Very nice. I will be making a trip to the JY today or tomorrow!

Great write-up!

Lou

I have a jeep...and it is modified...I win.

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post #6 of 28 Old 01-19-2014, 10:25 AM
jsawduste
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Picked my cover up.

Interesting point I found. While I do not know if the 4.0 TJ CCV system is different then the YJ`s I did do a JF search using the terms "oil in air box" and "oil in airbox" on the TJ forum and found a couple references. Both the 2.4 none on the 4.0. While using the same search terms on the YJ forum brings up plenty of hits.

Secondly I cannot confirm but am speculating that the TJ`s use the newer style VC. Perhaps better baffling with the later model VC is separating the oil from the vapors better ?

Linky on grommets from the TJ section. Again I do not know how this stuff translates over to a GC VC but it`s a start.
http://www.jeepforum.com/forum/f9/va...-4-0-a-539469/

Another
http://www.amazon.com/Dorman-47079-H...gy_auto_text_z

Check your stuff as this info has yet to be verified.
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post #7 of 28 Old 01-19-2014, 11:15 AM
94chb
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im running a 98 grand cherokee cover on mine theres info on my build thread, i also got rid of the external power steering resivor and used a built in one from the 98 grand and the serp belt.
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post #8 of 28 Old 01-19-2014, 01:22 PM Thread Starter
HaskiE
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Quote:
Originally Posted by adammannis View Post
Just exactly what I was looking for. Thanks for the post
Quote:
Originally Posted by bigbossd1030 View Post
Bumped for future reference.
Quote:
Originally Posted by Louie4 View Post
Very nice. I will be making a trip to the JY today or tomorrow!

Great write-up!
Quote:
Originally Posted by jsawduste View Post
Interesting.
Did not know there was a difference in the oil baffling. Found one on CL for 20 bucks. Going to pick it up tomorrow.

The "newer" design would appear to be a better engineered set up.

Thanks
cool, somebody found this! no prob, glad I could help guys!

Quote:
Originally Posted by jsawduste View Post
Picked my cover up.

Interesting point I found. While I do not know if the 4.0 TJ CCV system is different then the YJ`s I did do a JF search using the terms "oil in air box" and "oil in airbox" on the TJ forum and found a couple references. Both the 2.4 none on the 4.0. While using the same search terms on the YJ forum brings up plenty of hits.

Secondly I cannot confirm but am speculating that the TJ`s use the newer style VC. Perhaps better baffling with the later model VC is separating the oil from the vapors better ?

Linky on grommets from the TJ section. Again I do not know how this stuff translates over to a GC VC but it`s a start.
http://www.jeepforum.com/forum/f9/va...-4-0-a-539469/

Another
http://www.amazon.com/Dorman-47079-H...gy_auto_text_z

Check your stuff as this info has yet to be verified.
not sure on the differences from GC/TJ from what I can tell it looks like there are only two designs (old= aluminum and new= steel w/the baffle). My valve cover was obviously a disaster and I found that thread on comancheclub, so instead of just doing the gasket, seemed like a better move to upgrade. I just used what I could find - a TJ in a yard around here would get stripped in minutes; but there's always a pile of XJ's and Grand Cherokees.

Yeah, the PVC elbows are a *****. I think I broke both and used new ones from advanced autoparts. get the valve cover with them both intact if you can, they dont come off easy...

Quote:
Originally Posted by 94chb View Post
im running a 98 grand cherokee cover on mine theres info on my build thread, i also got rid of the external power steering resivor and used a built in one from the 98 grand and the serp belt.
me too! well, my powersteering was off an '88 xj. does your powersteering interfere with your airbox? mine kinda wedges and doesn't fit awesome... link to your build thread?

1992 YJ 1"Body Lift, Slip Yoke Eliminator & CV Driveshaft,
2.5" TJ exhaust, WJ valve cover, XJ Computer, External Slave Cyl AX15,
Durango Steeringbox, No track or sway bars, CJ tailgate, on 31's :)
#theneverendingaxe
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post #9 of 28 Old 01-19-2014, 08:29 PM
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Quote:
Originally Posted by HaskiE
well, my powersteering was off an '88 xj. does your powersteering interfere with your airbox? mine kinda wedges and doesn't fit awesome... link to your build thread?
I did the same upgrade.
My air box was a no go. So I just stuck an air filter on a piece of exhaust tube with 1/2" pipes welded on either side for the lines that come out of it. It's painted now so it looks 100x better but here is a pic.
Attached Images
 

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l----L-[]lllllll[]-
()_)-()_)--o)_)

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post #10 of 28 Old 01-19-2014, 09:18 PM
Dake
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Is the steel one that much better?

Waiting on my Rough Country lift to sag!
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post #11 of 28 Old 01-19-2014, 09:30 PM
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i run a tj air box



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post #12 of 28 Old 01-20-2014, 04:29 AM
jsawduste
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Quote:
Originally Posted by Dake View Post
Is the steel one that much better?
Cannot conclusively say it is but the baffle set up definitely seems to be an improvement over the pedestal baffle/breathers from a visual standpoint. Add to the fact that there seems to be little in the way of TJ owners complaining about oil in the airbox is also an indication.

My GUESS is that Mopar found out they could make the VC cheaper out of a steel stamping rather than aluminum and at the same time clean up emissions due to less oil in the intake charge. Remember this new VC came to be just about the same time the new more stringent OBD2 emissions came into effect.

In my personal case the way I have the CCV system set up I tend to pull a little bit of oil due to two vacuum sources. Having the (what I perceive to be) better baffling in the steel VC may have an effect on the amount of oil that gets drawn in.
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post #13 of 28 Old 01-20-2014, 04:39 AM
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Quote:
Originally Posted by 94chb View Post
i run a tj air box
Which is a darn good idea.

Quote:
Originally Posted by bigbossd1030 View Post
I did the same upgrade.
My air box was a no go. So I just stuck an air filter on a piece of exhaust tube with 1/2" pipes welded on either side for the lines that come out of it. It's painted now so it looks 100x better but here is a pic.
Boss, see all that dirt trapped between the pleats of your air cleaner ?

http://www.stu-offroad.com/engine/air1/air-2.htm

Will be doing this on my junk. Still think the stock/TJ box is the best of both.
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post #14 of 28 Old 01-20-2014, 05:40 AM
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Quote:
Originally Posted by 94chb View Post
Off topic and low priority, but in your pic: I see those underhood 'courtesy lights' in photos all the time. I assume it works with a version of a mercury switch. I want one. I haven't really needed it but...
After having bought a bunch of junk parts YJs and currently have my 89 driver, 91 project, and a 93 junker on hand, I haven't managed to own one that has this light. Or the wiring for it. Was this an option that didn't get sent to New England or something LOL or should I have bought a lottery ticket based on the fact I can't seem to buy a wrangler with the switch?

How many old threads actually convince *you* to read all 36 pages? http://www.jeepforum.com/forum/f12/length-envy-build-thread-629700/
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post #15 of 28 Old 01-20-2014, 06:29 AM Thread Starter
HaskiE
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Quote:
Originally Posted by bigbossd1030 View Post
I did the same upgrade.
My air box was a no go. So I just stuck an air filter on a piece of exhaust tube with 1/2" pipes welded on either side for the lines that come out of it. It's painted now so it looks 100x better but here is a pic.
Nice job, I like that idea

Quote:
Originally Posted by 94chb View Post
i run a tj air box



that's awesome! I put a tool box on that side... D'oh.

Quote:
Originally Posted by jsawduste View Post
Cannot conclusively say it is but the baffle set up definitely seems to be an improvement over the pedestal baffle/breathers from a visual standpoint. Add to the fact that there seems to be little in the way of TJ owners complaining about oil in the airbox is also an indication.

My GUESS is that Mopar found out they could make the VC cheaper out of a steel stamping rather than aluminum and at the same time clean up emissions due to less oil in the intake charge. Remember this new VC came to be just about the same time the new more stringent OBD2 emissions came into effect.

In my personal case the way I have the CCV system set up I tend to pull a little bit of oil due to two vacuum sources. Having the (what I perceive to be) better baffling in the steel VC may have an effect on the amount of oil that gets drawn in.
x2

Quote:
Originally Posted by jsawduste View Post
Which is a darn good idea.



Boss, see all that dirt trapped between the pleats of your air cleaner ?

http://www.stu-offroad.com/engine/air1/air-2.htm

Will be doing this on my junk. Still think the stock/TJ box is the best of both.
me too probably... or NHfireYJ's hummer intake setup... we'll see

1992 YJ 1"Body Lift, Slip Yoke Eliminator & CV Driveshaft,
2.5" TJ exhaust, WJ valve cover, XJ Computer, External Slave Cyl AX15,
Durango Steeringbox, No track or sway bars, CJ tailgate, on 31's :)
#theneverendingaxe
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