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willysmjeeps.com :: View topic - 1955 CJ5 PCV Question
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1955 CJ5 PCV Question

 
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Cobra99
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Joined: Sep 07, 2015
Posts: 6

PostPosted: Thu Sep 10, 2015 7:29 pm    Post subject: 1955 CJ5 PCV Question Reply with quote

Hello,

I have a 1955 CJ5 that I got running until all of the sudden when I went to start it, it was pumping oil from the oil bath through the carb. It seems to be a PCV issue, but the "Experts" I've talked to don't believe it has one. Attached is a picture of what I believe is the PCV valve. What I need to know if anyone has an idea, how to take it off correctly and clean or replace?

Any help is much appreciated.

Pat


PCV?
https://drive.google.com/file/d/11SaUXpV7xWUCI1VKk8nHPpNqCGI73SF9Mg/view?usp=sharing

Oil bath:
https://drive.google.com/file/d/1wj2FhFddTWjAHaEepTJ0QC8h2YV6gNaZug/view?usp=sharing

Jeep:
https://drive.google.com/file/d/1c9jLQoFea-kZjvl-sb9DBYlcGJo1tWQ35w/view?usp=sharing
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BullRun
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Posts: 459

PostPosted: Thu Sep 10, 2015 7:59 pm    Post subject: Reply with quote

PCV valves are readily available for a few dollars brand new.

Simply undo and replace.

Located on the lower left side of the block looking forward.
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4x4M38
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Joined: May 30, 2014
Posts: 3065
Location: Texas Hill Country

PostPosted: Thu Sep 10, 2015 9:01 pm    Post subject: Reply with quote

Yep, that's the pvc valve right under the manifold in your
first photo.

Are you sure the oil is coming from the air cleaner?

Check to see if you have a vent line from the oil fill tube
to the crossover pipe.

If you have a pressurized crankcase that's where the oil
will most likely come from.

Pull that PCV valve disassemble and clean.

Brian
_________________
Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
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4x4M38
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PostPosted: Thu Sep 10, 2015 9:07 pm    Post subject: Reply with quote

Second photo shows the vent line (rubber hose) leaving
the oil filler and going where ?

If it's going to the air intake between the cleaner and carb
that's probably the source of your oil.

Unless the oil level in the cleaner is too high. It can't be over
the fill mark.

Brian
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Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
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wesk
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Joined: Apr 04, 2005
Posts: 15042
Location: Wisconsin

PostPosted: Thu Sep 10, 2015 9:28 pm    Post subject: Reply with quote



Didn't I give you a link to Binky's CJ5 PCV page?



Here is another good page for the civvy PCV system on the F134. It's the CJ3B page:
http://cj3b.info/Tech.html

http://www.cj3a.info/tech/pcv.html

You will need to remove the two tube nuts on each side of the "T" fitting first. Then you can thread the valve itself out of the plumbing. Make sure flow arrow is pointing in the right direction. With the valve in your hand it should rattle when you shake it. If it doesn't then it obviously is gummed up. One hex end of the valve will unscrew. Document the order of parts removal. Photos are always a good idea. Then just clean it and reassemble.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php


Last edited by wesk on Thu Sep 10, 2015 11:30 pm; edited 1 time in total
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wesk
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PostPosted: Thu Sep 10, 2015 10:06 pm    Post subject: Reply with quote

Kaiser Jeep SB 508 dated 1961 covers the breakdown and installation of the system:



The other two pages are in my photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=album157&op=modload&name=gallery&file=index&include=view_album.php
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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Cobra99
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Joined: Sep 07, 2015
Posts: 6

PostPosted: Fri Sep 11, 2015 4:43 am    Post subject: Reply with quote

4x4M38 wrote:
Yep, that's the pvc valve right under the manifold in your
first photo.

Are you sure the oil is coming from the air cleaner?

Check to see if you have a vent line from the oil fill tube
to the crossover pipe.

If you have a pressurized crankcase that's where the oil
will most likely come from.

Pull that PCV valve disassemble and clean.

Brian


Brian,

It had been running fine for some time until it just got hard to start and when I pulled the hose from the air cleaner to the carb, they were both full of oil. I'm not much of a mechanic, but a buddy of mine said it looked like an issue we'd see if a PCV was clogged or not working. But he had never worked on any older jeeps, just muscle cars. So, before I tore it out and broke something I wanted to ask the guys who would know. I started with so called Jeep experts, who either didn't take the time to listen to the problem or just don't know. I asked them directly if there was a PCV on the 55 Willy's and they said "NO". After doing more research and reading the sites Wes sent me when I joined, I knew there was a PCV valve and should be a simple fix. But I wanted to share and make sure before I messed it up.

It looks like it will be a simple item to uninstall and clean/repair.

I'll let you all know how it goes.
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Cobra99
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PostPosted: Fri Sep 11, 2015 4:47 am    Post subject: Reply with quote

wesk wrote:


Didn't I give you a link to Binky's CJ5 PCV page?



Here is another good page for the civvy PCV system on the F134. It's the CJ3B page:
http://cj3b.info/Tech.html

http://www.cj3a.info/tech/pcv.html

You will need to remove the two tube nuts on each side of the "T" fitting first. Then you can thread the valve itself out of the plumbing. Make sure flow arrow is pointing in the right direction. With the valve in your hand it should rattle when you shake it. If it doesn't then it obviously is gummed up. One hex end of the valve will unscrew. Document the order of parts removal. Photos are always a good idea. Then just clean it and reassemble.


Wes, this is exactly what I needed. Thank you! Yes, you had sent me the links, which were helpful. But I didn't want to mess it up, so I wanted to be absolutely sure. This forum is awesome with the amount of information available. I really appreciate you annotating the photo, that is very helpful. I'm not much of an engine mechanic, so keeping it simple helps.

I'll let you know how it goes.

Thanks,

Pat
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4x4M38
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Posts: 3065
Location: Texas Hill Country

PostPosted: Fri Sep 11, 2015 5:29 am    Post subject: Reply with quote

If I remember my research correctly Willys was one of or the first
automakers to install emission control equipment on their
vehicles. The PCV valve was part of that installation.

It was not designed, as was mentioned earlier, as such, but
as a way to pressurize the crankcase while fording in high
water on military vehicles. This led to two things. The replacement
of the draft tube with this system on all vehicles, as well as
the deep water fording kits on the CJ3V and M38 and later
vehicles.

To enable driving in high water Willys Motors essentially started
emission control on automobile and truck engines.

Wes, if I've misstated feel free to correct.
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Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
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wesk
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PostPosted: Fri Sep 11, 2015 11:11 am    Post subject: Reply with quote

Note the date on the service bulletin. Delmar Roos filed for the Willys MB PCV valve patent in 1943. By the end of the 40's several manufacturers were using them. The mandatory requirements show up in 1961 in Cal. and 1962 over the rest of the US. Although designed to solve sealing of internal combustion engines for underwater operation during WWII, they were offered as an option on many brands of vehicles from 1945 through 1961/62.

Some folks confuse the early PCV systems with emission control systems. The primary purpose of the PCV valve is as stated above but eventually it became part of vehicle emission control systems starting in 1961.

For this reason your jeep gurus who said nay to your question may have been thinking smog or emission control systems of the 60's and up.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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Cobra99
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Joined: Sep 07, 2015
Posts: 6

PostPosted: Sat Sep 19, 2015 12:33 pm    Post subject: Reply with quote

wesk wrote:


Didn't I give you a link to Binky's CJ5 PCV page?



Here is another good page for the civvy PCV system on the F134. It's the CJ3B page:
http://cj3b.info/Tech.html

http://www.cj3a.info/tech/pcv.html

You will need to remove the two tube nuts on each side of the "T" fitting first. Then you can thread the valve itself out of the plumbing. Make sure flow arrow is pointing in the right direction. With the valve in your hand it should rattle when you shake it. If it doesn't then it obviously is gummed up. One hex end of the valve will unscrew. Document the order of parts removal. Photos are always a good idea. Then just clean it and reassemble.


OK, finally got it off the Jeep, it does not rattle, but I can use a straight piece to push on the edges of the brass inside. I don't see a way to get it apart. It doesn't mean there isn't, I just don't see it.

https://drive.google.com/file/d/0B66zfeSa-0UCYXB3ZlFad3RUZms/view?usp=sharing

https://drive.google.com/file/d/0B66zfeSa-0UCbkduZ1YtcFFLWG8/view?usp=sharing

https://drive.google.com/file/d/0B66zfeSa-0UCM2RKMDJCQUltTEE/view?usp=sharing
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wesk
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PostPosted: Sat Sep 19, 2015 7:18 pm    Post subject: Reply with quote

You are not looking at your own photo close enough!


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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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Cobra99
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PostPosted: Sat Sep 19, 2015 8:21 pm    Post subject: Reply with quote

wesk wrote:
You are not looking at your own photo close enough!



Thank you! I figured it out after I posted this, but didn't get back to update. It was pretty black and gummed up inside. Got it cleaned up and reinstalled but now I can't get it to start. I have the battery charger on it right now. Had it fire up for a little while, but couldn't keep it running.
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4x4M38
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PostPosted: Sun Sep 20, 2015 7:26 am    Post subject: Reply with quote

You may need to clean some oil out of your carb!
_________________
Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
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