oil in my air filter... - JeepForum.com
 
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post #1 of 15 Old 06-06-2004, 04:02 PM Thread Starter
hmk_21
 
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oil in my air filter...

ive heard the term 'blow by' used...
but whats the cause..

and how do i attempt to repair :/

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post #2 of 15 Old 06-06-2004, 04:08 PM Thread Starter
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sorry...

1989 YJ, 4.2L 6cyl
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post #3 of 15 Old 06-06-2004, 04:10 PM Thread Starter
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post #4 of 15 Old 06-06-2004, 04:15 PM
drew2000
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This is often caused by clogged PCV/CCV systems not allowing the crankcase to vent. I don't remember which system yours has, my 94 2.5 uses a CCV system which is very easy to clean out.

Drew

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Originally Posted by hmk_21

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post #5 of 15 Old 06-06-2004, 04:17 PM
RCHavok797
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Your 89 has a PCV system and is located on the valve cover.

2005 LJ Impact Orange 4.0L Automatic (Tigger) - new ride
1991 YJ Sahara 4.0L Automatic
1978 Dodge Lil Red Express - work in progress
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post #6 of 15 Old 06-06-2004, 05:27 PM Thread Starter
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so is it a matter of replacing the pcv value?

seconds of work i gather...
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post #7 of 15 Old 06-06-2004, 07:36 PM
MarathonScott
 
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It doen't take long, just make sure the grommet that the PCV valve plugs into is soft and not hardened. If it gets hard, it won't make a good seal.
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post #8 of 15 Old 06-07-2004, 08:15 AM
gustaia
 
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oil in th eair filter

Quote:
Originally Posted by hmk_21
ive heard the term 'blow by' used...
but whats the cause..

and how do i attempt to repair :/
I had the same thing, I tried cleaning the orifices and vacum hoses to no result...but i bought an oil separator (I did a search on yahoo/shopping) for about 8$ (6$= 2$ shipping). It took me 2 minutes to install it (it fitts where the oil caps goes) and since then no more oil in the air filter...
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post #9 of 15 Old 06-07-2004, 08:56 AM
RCHavok797
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Quote:
Originally Posted by gustaia
I had the same thing, I tried cleaning the orifices and vacum hoses to no result...but i bought an oil separator (I did a search on yahoo/shopping) for about 8$ (6$= 2$ shipping). It took me 2 minutes to install it (it fitts where the oil caps goes) and since then no more oil in the air filter...
I've never heard of an oil separator. Can you tell me more about it?

2005 LJ Impact Orange 4.0L Automatic (Tigger) - new ride
1991 YJ Sahara 4.0L Automatic
1978 Dodge Lil Red Express - work in progress
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post #10 of 15 Old 06-07-2004, 09:00 AM
Tshark299
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Quote:
Originally Posted by hmk_21
so is it a matter of replacing the pcv value?

seconds of work i gather...
Hopefully it's the PCV valve... that would be the cheapest problem to fix. There are other causes for blow-by. Ive heard about people taking off their valve cover and cleaning off all the gunk inside that can clog the vents on top and basically do the same thing as a bad PCV valve.

Blow-by can also be caused by worn piston rings in the engine which allow some of the exploding gas in the cylinder to slip past into the crankcase and kinda pressurize the valve cover... which is relieved through that vent into the air cleaner.


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post #11 of 15 Old 06-07-2004, 09:08 AM
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Or, you can do what I did, if a new PCV doesn't cure your oil-filled air filter. I removed the hose that connected the PCV to the air filter, and rerouted it from the PCV to the lower end of the motor compartment. No more oil in the air filter

Jason T.
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post #12 of 15 Old 06-07-2004, 10:08 AM
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Quote:
Originally Posted by JaySHOguy
Or, you can do what I did, if a new PCV doesn't cure your oil-filled air filter. I removed the hose that connected the PCV to the air filter, and rerouted it from the PCV to the lower end of the motor compartment. No more oil in the air filter
sounds about right!! I think any one with the ol 258 is going to have a blow by problem, just ask the cj owners!!

I have tried everything short of replacing the motor with no results. i ended up routing a hose out of the valve cover into a "catch can" type container that way the pressure could be released and any oil that came out with the pressure could be caught instead of dripping on the ground or in the motor bay.
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post #13 of 15 Old 06-07-2004, 10:36 AM Thread Starter
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Quote:
Originally Posted by JaySHOguy
Or, you can do what I did, if a new PCV doesn't cure your oil-filled air filter. I removed the hose that connected the PCV to the air filter, and rerouted it from the PCV to the lower end of the motor compartment. No more oil in the air filter
so it simply blows any blow-by into the open air?
this sounds like a decent idea
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post #14 of 15 Old 06-07-2004, 11:11 AM
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Quote:
Originally Posted by hmk_21
so it simply blows any blow-by into the open air?
this sounds like a decent idea

With my set-up, yes. Or, you could set-up a catch-can like rollmeover did. It just vents the blow-by somewhere else, instead of into the air filter.

My blow-by was extremely bad when I bought the Jeep. Within a 1-minute drive up the street after changing the PCV and the airfliter, they were both oil-soaked (Jeep sat for a little while before I bought it). Since my quick "repair", I have not noticed any oil coming out of the hose anymore...

Jason T.
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'04 WJ:Special Edition. V8, QTII, 2"BB, Bilsteins & 245/75/16" Goodyears
'02 WJ:4.7L, Selec-Trac. Totalled 9-12-07. Click to hear
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post #15 of 15 Old 06-07-2004, 05:07 PM
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Quote:
Originally Posted by JaySHOguy
Or, you can do what I did, if a new PCV doesn't cure your oil-filled air filter. I removed the hose that connected the PCV to the air filter, and rerouted it from the PCV to the lower end of the motor compartment. No more oil in the air filter
This is actually what I did, execpt I put a small breather filter on the end of the hose to keep any dust or whatever out.


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