AMC360 PCV plumbing - JeepForum.com
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post #1 of 13 Old 09-21-2021, 11:31 AM Thread Starter
CJKevin1978
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AMC360 PCV plumbing

I've been driving this Jeep with a 360 swap for a while and decided that its time to get get the nasties out of my crank. What I think is the PCV valve has a rubber cap as does the back of my carb. I have oil in my air cleaner and on the front 1/2 of the engine.

So, I have ordered a PCV valve and I think I may have gotten the wrong one. What I got has three barbed outlets but my engine does not have a rubber grommet. I will try to attach pics.

It seems that this valve is supposed to connect to the manifold, the carb and a charcoal canister. I don't have a charcoal canister.

Please have a look at the pics and tell me:
Is the old valve inside the existing connection to the manifold?
Can I simply connect this 3-port PCV to the hard pipe and the back of the carb then run the third outlet ?someplace?
Does this valve need to be mounted vertically?

Thanks in advance

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post #2 of 13 Old 09-21-2021, 12:20 PM
uptillnow
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I don't see many V8 Jeep engines. Maybe someone can chime in here who knows more about this than me.
I have a drawing from a TSM that may be of some help. (?)
UTN
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post #3 of 13 Old 09-21-2021, 01:50 PM
Matt1981CJ7
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The PCV valve you got is different from what the factory used.

I had trouble finding the correct grommet when I built my 360, so I made my own from a rubber plug that I found at the hardware store.

Since you don't have a vapor canister, you don't need the T that's shown in my pic.
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post #4 of 13 Old 09-22-2021, 08:23 AM Thread Starter
CJKevin1978
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Matt, do you have a canister that is not yet connected in that pic or do you run yours with the tee open? At this point, I am probably going try connecting mine similar to your and check the status of the third port (pressure/vacuum).

As I understand it, I should have a gentle vacuum on the oil filler neck when things are correct.
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post #5 of 13 Old 09-22-2021, 09:19 AM
Matt1981CJ7
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Quote:
Originally Posted by CJKevin1978 View Post
Matt, do you have a canister that is not yet connected in that pic or do you run yours with the tee open? At this point, I am probably going try connecting mine similar to your and check the status of the third port (pressure/vacuum).

As I understand it, I should have a gentle vacuum on the oil filler neck when things are correct.
Kevin, that pic was taken when I was still assembling my 360. I do have a vapor canister that is hooked up to the T.

Yes, you should have a small vacuum at the filler neck when the engine is running. I'd also recommend connecting your filler cap to the air cleaner, as shown in UpTillNow's pic. That way your engine will pull clean filtered air into the crankcase, instead of dirty air from the engine compartment.

Here's a few more pics for you. The part number for the grommet in the first pic was wrong, at least for my Edelbrock intake I never determined the correct part number, perhaps someone else here has.


Good luck,

Matt
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post #6 of 13 Old 09-22-2021, 09:40 PM
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Some quick research...

https://theamcforum.com/forum/thread...opic30797.html

Paperwork will ruin any military force.
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post #7 of 13 Old 09-23-2021, 05:31 AM
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On my '79 CJ5 304 I used this Edelbrock PCV grommet with my Edelbrock 2131 intake:

https://www.summitracing.com/parts/edl-4299

I use this PCV valve: (My 5 has a new charcoal (EVAP) canister.)

https://www.summitracing.com/parts/s.../cj5/year/1979

Both work fine.

Answer to a question on Summit Racing Site by Edelbrock for this product:

Edelbrock went out and had this AMC/Jeep PCV Grommet Made, as the Factory version is no longer available, 100% A-OK with a Factory OEM Cast Iron Intake Manifold, as All Edelbrock AMC/Jeep Intake manifolds are Machined to Accept the Factory Rubber Grommet, 4299 is a PVC Grommet intended for 1967-1991 OEM and Edelbrock AMC/Jeep Intake Manifolds. This Grommet is Designed for use with Factory or Factory Replacement PCV Valves. The Grommet is Black in color and has “EDELBROCK” molded in on the top surface. See below for dimensions, OD of Grommet where it fits in the Intake Manifold is 1.0", The Grommet where it Fits in is .250" Thick, OD of Top of Grommet is 1.50", ID for Grommet or PCV Valve is .500" OD Valve, I hope this answers your inquiry...

Edelbrock Answer - 11/30/2020
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post #8 of 13 Old 09-23-2021, 06:28 AM
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So, according to JeepDaddy's link there is two different PCV configurations found on AMC V8s. One is a non-threaded hole that uses a grommet, and the other is a threaded hole that uses a elbow fitting. It appears the OP has the latter configuration. I learn something new every day.

Kevin, the PCV valve you got should work, assuming it fits into the elbow fitting snuggly. Just be sure to cap off that extra port, if you don't use it for a vapor canister.

Matt
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post #9 of 13 Old 09-23-2021, 09:51 AM
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An FYI to all....
I've found the various Rambler and AMC forums a plethora of information on some of the oddball issues that crop up from time to time.

Paperwork will ruin any military force.
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post #10 of 13 Old 09-23-2021, 12:41 PM
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PCV rubber grommet - Stock number 3181287

I found an exact replacement - just can't find the picture or info at the moment.
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1972 CJ5 304 V8, 3 speed manual trans
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post #11 of 13 Old 09-23-2021, 03:41 PM
atrusler
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I have my 360 connected the same way that Matt has in his pic and diagram (without the T in the line). I had trouble with the new grommet on the PCV valve so ultimately modified it with a razor blade and cut down the bottom lip to make it fit better. Still not perfect but it works. I tried a few different ones and never found one that fit perfectly (Edelbrock Torker manifold).
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post #12 of 13 Old 09-25-2021, 08:06 AM Thread Starter
CJKevin1978
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Well I installed my 3-outlet PCV valve horizontally with the third outlet plugged. I do find a slight vacuum on the oil fill neck and the engine actaully seems more content. I cleaned out all the oil that had collected in the air cleaner. We'll see if it stays clean. This was step 1 in an attempt at a cleaner garage floor.

Thanks to all for the input...
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post #13 of 13 Old 09-25-2021, 08:47 AM
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Don't forget to readjust your idle mixture.

Paperwork will ruin any military force.
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