oil in all of the wrong places - JeepForum.com
 
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post #1 of 7 Old 08-27-2011, 01:06 AM Thread Starter
ore4x4
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oil in all of the wrong places

my comanche has an oil leak on the valve cover the rubber fitting is worn out, and there is oil on the air filter.

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post #2 of 7 Old 08-27-2011, 09:22 AM
ftpiercecracker
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1990 MJ Comanche 
 
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well you probably just need to replace your valve cover gasket, that should solve the leaking. as for the oil in the air filter, what happens is oil fumes that are burned of the motor because of the leak get pulled into the filter and ta da you have an oily filter, but if there is literaly a pool of oil i am not sure what on earth would cause this. It might also be your PCV valve, all very simple things. just ask your local auto parts store. uless you have a washable K&N air filter you should probably get a new one. let me know if this works.
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post #3 of 7 Old 08-27-2011, 09:24 AM
ftpiercecracker
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replace your PCV valve and your air filter.
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post #4 of 7 Old 08-29-2011, 06:50 AM
Garvin
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There is no PCV valve. The PCV is integrated into the valve cover. What you need to do is clean the valve cover up real well in the inside top, find a rubber grommet that fits in the top and replace the air filter. Blow by is a very common issue with these Jeeps and is fairly easy to fix.

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post #5 of 7 Old 08-29-2011, 12:15 PM Thread Starter
ore4x4
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thanks for the help.
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post #6 of 7 Old 08-29-2011, 04:52 PM
cruiser54
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Quote:
Originally Posted by Garvin View Post
There is no PCV valve. The PCV is integrated into the valve cover. What you need to do is clean the valve cover up real well in the inside top, find a rubber grommet that fits in the top and replace the air filter. Blow by is a very common issue with these Jeeps and is fairly easy to fix.
This^^. Replace the vacuum harness that includes the valve cover grommets while you're at it. Napa has them priced reasonably.
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post #7 of 7 Old 08-30-2011, 07:01 PM
DonBC
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When I got my 89 Comanche it was pushing oil over to the air filter when driving and sucking oil into the intake manifold when I was stopped at a light. It would go through about a litre of oil in 500 km. Compression was good and there was little blow-by when the oil filler cap was off on the valve cover. I finally removed the valve cover and saw the source of my problems. Everything under the valve cover was coated with at least 1/4" of sludge. The ventilation passages near the top of the valve cover were plugged so the only opening was near the bottom of the valve cover. The space around the push rods was almost closed off so the oil had trouble getting back to the crankcase and it would build up to the lower ventilation openings in the valve cover and get drawing into either the air filter or the intake manifold. I don't think that this truck ever saw any highway miles, just city stop and go driving. I spent over 6 hours cleaning the valve cover and everything under the valve cover. I flushed the engine twice with kerosene and then engine cleaner just before the next two oil changes. No more smoke and oil consumption is an acceptable 1 litre every 2500 km.
The seller told me it needed an engine overhaul. It turned out to be a cheap fix and it runs beautifully.
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