Crankcase Breather - JeepForum.com

 
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post #1 of 13 Old 06-15-2003, 02:15 PM Thread Starter
MudLover
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Crankcase Breather

Ok, I don't have the stock air filter assembly on my 258, which may be one of the reasons I'm having the problem I'm about to describe. The line which runs from the back of the crankcase to the air filter is throwing oil into the carb. I got a new air filter about 2 weeks ago, and it is almost completly black from the oil. How can I fix this? Can I just make the line longer or is there I filter I can stick in the line? I thought this tube was only suposed to carry air into the carb from the crankcase. What if I just put some cotton in the line? Will that help take the oil out or is that just running a huge risk of the cotton being sucked into the engine?

HELP!!!
Marc


1979 CJ5 project
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post #2 of 13 Old 06-15-2003, 03:02 PM
goody350s
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i was told you will have a little blow by from the crankcase
but to me from what you are describing sounds exessive
im not quite sure what causes the blowby you are having
hopefully someone with more knowledge will get in here
and help you out further
im just gonna throw this out and if im wrong im sorry
but maybe it has somthing to do with worn out rings
which would let the oil by easier i dont know
just trying to trow some ideas out
i dont think you would want to stuff cotton down the line
i think that would defeat the porpose of why the line is there
i have seen the breathers out there that are filtered
but to me that is puting a bandaid over a problem
that is still going to be there
anyway thats my.02

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post #3 of 13 Old 06-15-2003, 03:25 PM
CJchris
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The only thing I can think of is that you might have too much oil in your engine. If you do, the crank will hit the oil in the pan while it is spinning and make it foam up, which could get it into the breather tube. I wouldn't put cotton or anything in the tube either. Have you noticed any other problems, smoking, etc.? You also posted about having a gas smell in your garage, is that only since you out the new filter on, or have you always had that problem? I don't know how they could be related, but its something to think about.

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post #4 of 13 Old 06-15-2003, 05:11 PM Thread Starter
MudLover
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The gas smell's been there for a long time, so I don't think it stems from this problem.

Marc

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post #5 of 13 Old 06-15-2003, 09:15 PM
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How many miles on the engine......sounds like blow-by.

Ed
1975 CJ-6 1983 CJ-8
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post #6 of 13 Old 06-15-2003, 11:02 PM Thread Starter
MudLover
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Odometer reads 112000, and I dunno when the last rebuild was.

Marc

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post #7 of 13 Old 06-16-2003, 11:00 AM
mxg342
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Blow by is the problem. Just take the line off at the air cleaner and route it towards the ground. You don't need it to recirculate. That way you can save the air filters. Make sure you plug the hole in the air cleaner so its not sucking dirty air through your motor

I had the same problem once I put on my weber and that's what I did to 'fix' it. (or at least save the air filter)

'84 CJ-7 Junkyard TBI 360/T18/D300, 4" 4WDH Lift, D44 front with ARB and HS/D44 Rear w/ Detroit, 4.56s, 36" Iroks, TFI, TJ flares, Homemade rocker guards and bumpers with swing out, Optima Yellow Top, M8000, York OBA, 6pt cage
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post #8 of 13 Old 06-16-2003, 01:19 PM Thread Starter
MudLover
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Quote:
Originally posted by mxg342
Blow by is the problem. Just take the line off at the air cleaner and route it towards the ground. You don't need it to recirculate. That way you can save the air filters. Make sure you plug the hole in the air cleaner so its not sucking dirty air through your motor

I had the same problem once I put on my weber and that's what I did to 'fix' it. (or at least save the air filter)
That's a good idea, but it only sounds like a temporary fix. What causes the "blow by"?

Thanks,
Marc

1979 CJ5 project
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post #9 of 13 Old 06-16-2003, 10:24 PM
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The cause is a tired engine. The clearances are getting excessive causing oil to pass by certain components e.g. piston rings, valve guides.

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post #10 of 13 Old 06-17-2003, 12:49 AM Thread Starter
MudLover
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So, do you think a rebuild is in order fot this engine? It's been giving me all sorts of trouble lately. It now shoots huge clouds of smoke in 3rd and 4th if the engine's not warm.

Thanks,
Marc

1979 CJ5 project
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post #11 of 13 Old 06-17-2003, 06:50 AM
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Personally, I wouldn't rebuild unless I had to. I rebuilt my El Camino when it simply wouldn't pass smog no matter what I did to the carb, tune ect. I won't rebuild my 258 until it won't pass smog, or it won't get me where I want to go reliably.

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post #12 of 13 Old 06-18-2003, 06:49 AM
CJay7
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I have one comment on the routing of the line downwards instead of going to the air filter. The line goes through the air filter to filter incoming air to the crankcase. With the line routed downward you will risk sucking in dirty/wet air from the engine bay. I would install a K&N breather/filter to avoid dirty air from entering the crankcase. When it gets dirty clean it, re-oil it, and put it back on.

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post #13 of 13 Old 06-18-2003, 11:21 AM
jadams68
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Why not get yourself a stock air filter assembly and use the little oil trap filter (small square piece for like 2 bucks at Napa) that the CCV hose from the back of the engine feeds into.

i had the same issue with my 84...

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I used to own two CJ's...Perhaps a 3rd is in the future?
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