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Old 06-11-2013, 01:53 PM   #1
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Charcoal canister leaking oil

Hey all,

I had a bad oil leak on my 1990 YJ 4.2 auto a while back. I replaced the valve cover gasket, cleaned the valve cover, replaced PCV valve and grommet, replaced air cleaner elbow and grommet, and the oil fill cap. Ive been great for some time now, but noticed today at work when I went to get something from the jeep I had a pretty nice oil puddle on the drivers side. I popped the good and could see the charcoal canister has a pool of oil under it. Won't be able to investigate further until this evening. Any ideas on the cause? Is a good fix the ol' catch can method? Any help is greatly appreciated.


I can provide pics of my setup if needed. I wonder now if I have ll my lines hooked up right....

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Old 06-11-2013, 02:45 PM   #2
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You may have bigger issues.....
The Charcoal canister captures fuel vapors and prevents them from escaping to the atmosphere and then stores the fumes and recycles them to the fuel tank or engine intake for combustion as needed. It should not be collecting oil at all. If it's full, then something is connected improperly.

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Old 06-11-2013, 02:54 PM   #3
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Quote:
Originally Posted by Scott-CJ8 View Post
You may have bigger issues.....
The Charcoal canister captures fuel vapors and prevents them from escaping to the atmosphere and then stores the fumes and recycles them to the fuel tank or engine intake for combustion as needed. It should not be collecting oil at all. If it's full, then something is connected improperly.
I have to go with this. Plus, unfortunately you could have developed a rear main seal leak.
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Old 06-11-2013, 03:09 PM   #4
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Quote:
Originally Posted by Scott-CJ8 View Post
You may have bigger issues.....
The Charcoal canister captures fuel vapors and prevents them from escaping to the atmosphere and then stores the fumes and recycles them to the fuel tank or engine intake for combustion as needed. It should not be collecting oil at all. If it's full, then something is connected improperly.
The fuel vapors thing goto thinking....all was good until today. Yesterday I messed with my FPR because the gauge was all over the place. Is it possible i have too much pressure on the line?
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Old 06-11-2013, 03:10 PM   #5
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Did a search.... found this .... it might help, as it describes how to clean out the canister and eliminate pressure....
Charcoal canister: maintenance and repair - Bob Is The Oil Guy
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Old 06-11-2013, 03:40 PM   #6
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Originally Posted by Scott-CJ8 View Post
Did a search.... found this .... it might help, as it describes how to clean out the canister and eliminate pressure....
Charcoal canister: maintenance and repair - Bob Is The Oil Guy
That might do the trick. Thanks!
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Old 06-12-2013, 03:41 PM   #7
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Figured out the problem. I've got or at least had excessive blow by. This was pouring in to te air cleaner. There's a hose from the air cleaner to the charcoal can. Evidently it got so full it started leaking out. This weekend I plan to disassemble and clean/bypass it. In the meantime, I've made a crappy catch can. Tonight I plan to assemble a better one. The first was just to test my theory. I will post pics of the new can soon.
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Old 06-19-2013, 01:24 PM   #8
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Looks like I also had a bunch of air and vacuum hoses hooked up wrong. I've rerouted them using a diagram I found here and that seems to have helped. I still have blow by, but I think that may be due to an incorrect dipstick. I think I might be over filling, and so it blows out of the valve cover since that's the weakest point. Going to drain the oil and fill it per manufacturers specs and see where I measure on the stick.
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Old 06-19-2013, 02:34 PM   #9
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Let us know if it fixes your issue information is valuable you may be helping someone with out even knowing it.

thanks
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Old 07-06-2013, 06:53 AM   #10
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I think I finally figured out my blow by issue. I ran some sea foam directly into the oil filler cap and promptly drained the oil 50 miles later. Changed the filter and put fresh 10w-30 in, versus the 5w-40 that was in there. I took the valve cover off and took the baffles apart. Then I cleaned the heck out of all the parts. It's mostly metal now instead of mostly looking like a tar pit. I put it all back together and moved the pcv to the rear port on te valve cover. I put a breather in the front. So far the only oil I see is whats leftover from the previous blow by. I plan on power washing the engine today to see for sure.

It also might be worth mentioning that I swapped out my Weber for a Motorcraft carb. Maybe that has helped pull proper vac pressure? Maybe not, I don't know. As far as the charcoal can goes, I just removed it for now until I can either clean it out or buy a new one.
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Old 01-21-2014, 05:40 PM   #11
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Turns out I broke a ring. Compression tests and camera confirmed. Instead of rebuilding the engine, I replaced it with another 258 4.2.

The process has gone fine until now. I didn't label my fuel lines before disconnecting from pump, hard lines, and filter. They are just along the frame with the brake lines, capped. Anyone know which is supply and which is return? If not, is there a safe way to test? Thanks.

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