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  #1  
Old 02-17-2011
Tnscouter Tnscouter is offline
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What can happen if a pvc valve is installed incorrectly?

Exactly what is says.
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  #2  
Old 02-17-2011
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Re: What can happen if a pvc valve is installed incorrectly?

You'll have plumbing problems.

Oh, you mean PCV valve?

Do you mean if it is installed backwards? As far as I know a typical PCV valve will not allow vacuum to pass if it is installed backwards. So there shouldn't be a vacuum leak, but the crankcase ventilation system won't work correctly. You would probably smell fumes, and possibly see smoke/fumes around the engine.
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Old 02-17-2011
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Re: What can happen if a pvc valve is installed incorrectly?

They only really fit one way. But if you have it backwards it simply will not work, and you will have improper crank case pressure. This can cause blow by to puke oil out of the filler cap.

One side of the pcv valve goes to the intake, the other to the valve cover.
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Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

TN Scouter, I bought a perfect PCV the other day for my Scout, I'll get you the Part Number. I was amazed at how well it worked and fit!
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Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Please pardon my ignorance on this, but my engine does not have a PCV anywhere that I know of...are you guys adding one in or am I missing something??
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  #6  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Me too Azacher, Mine has a hose from a fitting low on the passenger front of the block to the air cleaner and a hose from a fitting on the rear of the valley pan that vents to atmosphere. No PVC valve or control of any kind that I can see.
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  #7  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Is this a 4 CYL Engine we're discussing? If it is, I can tell you exactly how you should be plumbing all of this because I just did it and Mark Taught me well, lol.
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  #8  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

We both have 266 V8s Mumpy.

Thanks
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  #9  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Ahh
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  #10  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Quote:
Originally Posted by 101vet View Post
Me too Azacher, Mine has a hose from a fitting low on the passenger front of the block to the air cleaner and a hose from a fitting on the rear of the valley pan that vents to atmosphere. No PVC valve or control of any kind that I can see.
A typical IH V-8 PCV system needs two hoses, one for crankcase fumes to exit the engine and enter the combustion air and a second hose to provide fresh clean air to the crankcase to replace the fumes that are removed by the PCV valve/hose.

The hose in the rear of the valley pan should have a PCV valve in it, and the hose should connect to the base of the carb or a fitting on the intake manifold near the base of the carb. Not all IH engines are identical.

The second hose is typically attached to the left valve cover (driver side) to a fitting which is the Flame Arrestor which screws into the valve cover. The flame arrestor prevents any carb backfire from igniting the engine fumes. The other end of this hose connects to a hose fitting on the base of the air cleaner housing which supplies the hose/engine with clean air.

Older engines can and do have different hose set ups. Some have the PCV in the right (passenger side) valve cover. Some have a hose from the oil filler tube in the front of the engine. The important thing here is that the engine needs to exhaust the fumes/blowby from the crankcase and ingest clean air. If it can't do both of these, then some problems can occur, such as leaking gaskets due to no PCV venting the internal crankcase air pressure or a build up of moisture in the oil, for example.

Six cylinder and 4 cylinder engines have similar PCV set ups.
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  #11  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Hell, since we're on PCV Set ups, I know mine is a 4cyl but I'll go ahead and show what I have and how I did it.

First the PCV Part # I used.

Notice the Black Background? Notice how Black that is? That's my New Headliner, MAN I'm LOVING ME SOME NEW HEADLINER!!!!

Ok, so I used a Barbed Fitting to screw into my Valve Cover and used a 3/8" Hose to insert on it. That hose goes from here, to my Air Cleaner where I have a Hole drilled so the Hose can enter the Air Cleaner and I've Plugged my PCV there.





Then on my Intake I have a fitting on the side and it has a hose going from there and into my Valley pan.


I know it's a 4cyl, but who knows, maybe someone down the road will need this info and have a 4cyl and stumble on this thread 3 years from now, HEHE!
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  #12  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Well I can see that I need to do some restoring of the crankcase ventilation system. The manual mentions a metering valve at the connection on the valley pan and then connecting to the intake maniflod. Instead I have just a straight vent hose to atmosphere. I'm assuming that there should be vacumn from the intake maniflold drawing air through that metering valve? Do you guys think the metering valve mentioned is an early PVC valve, and would a PVC valve in its place work if I can't come up with the metering valve?
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  #13  
Old 02-18-2011
Lowell Lowell is offline
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Re: What can happen if a pvc valve is installed incorrectly?

Did the early Scout with 152s have a PVC valve or just a breather cap on the fill tube?
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  #14  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

One more time, it's PCV, not PVC.

Yes, metering valve = PCV valve.
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  #15  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Quote:
Originally Posted by Lowell View Post
Did the early Scout with 152s have a PVC valve or just a breather cap on the fill tube?
Prior to chassis no. FC 63573, they had a road draft tube & breather cap only. The PCV system appeared beginning with the aforementioned chassis number.
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  #16  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

[QUOTE=George Womack;110930]One more time, it's PCV, not PVC.

Ya got me there Dad. I could blame it on dyslexia, or I could fess up and claim ignorance

I think I'll go and write "PCV" on the blackboard a few hundred times

Oh, and thanks a million for the clarification.
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  #17  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Just to be REALLY picky, V8 engines have a valley pan. Not so on 4-cylinder engines--they have a tappet cover.
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  #18  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

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Originally Posted by George Womack View Post
Just to be REALLY picky, V8 engines have a valley pan. Not so on 4-cylinder engines--they have a tappet cover.
Just to get under your skin a little bit and it's Friday... It's a Push Rod Cover

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  #19  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Quote:
Originally Posted by George Womack View Post
Prior to chassis no. FC 63573, they had a road draft tube & breather cap only. The PCV system appeared beginning with the aforementioned chassis number.
Now more confusion. You just described what I have, I think. My line ticket list the chassis number as G 260982 which looks like a much later number than you mention but with a different prefix.
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  #20  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Quote:
Originally Posted by Mumpy View Post
Just to get under your skin a little bit and it's Friday... It's a Push Rod Cover

IH calls it a tappet cover.
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  #21  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Quote:
Originally Posted by 101vet View Post
Now more confusion. You just described what I have, I think. My line ticket list the chassis number as G 260982 which looks like a much later number than you mention but with a different prefix.
Maybe the engine was swapped in from an earlier Scout? The G numbers started in 1966.
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  #22  
Old 02-18-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Yep, they may call it a Tappet cover, but IH ain't selling you the stuff! The people that are selling you the stuff are calling it a Push Rod Cover!


P.S. I'm just messing around since I'm completely bored at work looking outside my window and wishing I was driving my Topless Scout on some Dirt Road looking for Turkey Sign!
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  #23  
Old 02-19-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Quote:
Originally Posted by George Womack View Post
Prior to chassis no. FC 63573, they had a road draft tube & breather cap only. The PCV system appeared beginning with the aforementioned chassis number.
This is my situation, my chassis no is something like FC 49997, and all I have is the road draft tube and oil breather cap. At first I thought the road breather tube was a PO-ism but found mention of it on the board here which made me feel better
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  #24  
Old 02-20-2011
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Re: What can happen if a pvc valve is installed incorrectly?

After reading this thread, I have come to realize two things. First, one is I think my PCV is set up backwards (I can Thank Mark B for pointing this out) and I think mine is supposed to have the Road Draft Tube / Oil Breather Cap.

Now, gonna have to figure out how to make the PCV system work because I don't want the Road Draft Tube and Oil Breather Cap.
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  #25  
Old 02-20-2011
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Re: What can happen if a pvc valve is installed incorrectly?

Quote:
Originally Posted by Mumpy View Post
After reading this thread, I have come to realize two things. First, one is I think my PCV is set up backwards (I can Thank Mark B for pointing this out) and I think mine is supposed to have the Road Draft Tube / Oil Breather Cap.

Now, gonna have to figure out how to make the PCV system work because I don't want the Road Draft Tube and Oil Breather Cap.
You are right! What you posted above how you installed the PCV valve is wrong.

The PCV valve needs to be conected to engine somewhere and a hose from it to vacuum. Then you need another hose from engine to the air filter so it will draw in clean filtered air.
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