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  #13  
Old 08-20-2011, 08:14 PM
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Re: Oil consumption

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Originally Posted by 2005JGC View Post
negitory... oil control rings are not compression rings, you could theoretically have failed oil control rings and still have proper combustion or visa versa.

furthermore all the time to do a leakdown test and its only checking ONE possible cause of oil intrusion into the cylinder... Im simply stating that for how much it would "help" diagnose the problem it would take SO much time and still be a half ass pinpoint.
So what would you do? Buy another PCV valve?
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  #14  
Old 08-22-2011, 06:39 AM
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Re: Oil consumption

Is smoking out the back pipe
1- When idling?
2- When accelerating?
3- When leaving traffic lights etc? (Small amounts of idle time)

Have you tried holding revs in park or neutral at constant 3000-3500rpm to see what gives?

Does the PCV pipe have excessive oil in it?
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  #15  
Old 08-22-2011, 07:56 AM
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Re: Oil consumption

It doesnt smoke in idle, but when accelerating from a stop, some smoke appears. (and not always) I dont see it when im driving it in this case, but only when im outside.
Also during strong acceleration on the highway i can see some smoke (especially at night with other cars behind)
Also tried reving the engine when standing still, but most off the time no smoke present, and when there is, its only for a second or so and then disappears, with the engine at 3000 rpm.
The PCV line is quite wet from the inside, but i have no idea what is suppost to be normal.
I will plug the PCV line for a test, lets see.
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  #16  
Old 08-22-2011, 12:02 PM
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Re: Oil consumption

Dont plug it, your better off to disconnect it and wrap a rag around it to catch any oil that spurts out... you would rather vent too much out of your crankcase than plug it.

I have seen a WK 4.7l that obviously was burning oil, when the sparkplugs were removed cylinder 7 seemed to be the culprit... it was the only oil saturated plug. It was actually the PCV valve that seemed to dump its oil load down into cylinder 7's intake runner.
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  #17  
Old 08-22-2011, 03:56 PM
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Re: Oil consumption

I agree don't plug PVC, it's a vent and need to vent to stop crankcase pressurizing.
If anything rag it as said, or set-up a catch can.
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Old 08-22-2011, 07:18 PM
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Re: Oil consumption

Quote:
Originally Posted by 2005JGC View Post
negitory... oil control rings are not compression rings, you could theoretically have failed oil control rings and still have proper combustion or visa versa.

furthermore all the time to do a leakdown test and its only checking ONE possible cause of oil intrusion into the cylinder... Im simply stating that for how much it would "help" diagnose the problem it would take SO much time and still be a half ass pinpoint.

plus, a leakdown is only "free" when you own a leakdown tester.

I know that oil control rings are not compression rings, BUT if your compression rings are going bad along with you oil control ring, POOF there you go burning oil....


I've seen oil control rings intact and bad rings on a cylinder and the car was still burning oil. New rings cured the problem...


James
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  #19  
Old 08-22-2011, 09:00 PM
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Re: Oil consumption

I know that and I am by no means arguing that its not his rings, simply stating he stated that changing the pcv valve has helped in the past. To take the time to do a leak down test which at a shop would be costly to pay them otherwise this "free" leakdown test would cost you anywhere from 250-500 dollars in a leakdown tester and a compressor. furthermore it would take the time and energy to do the test, when at the end of the day you dont know if the 40% leakage your getting on a cylinder is actually where your burning oil is coming from.

I like to do things as easily as possible, if he deturmines it to be the rings and its a task he wants to undertake, he must go in from the top and bottom to get the pistions out and at that point he can look down into the runners for oil buildup on the stem and back of the valve and also replace stem seals. A leakdown test will point him in a direction to look but not tell him the problem like a leakdown would tell you why a cylinder is misfiring.

Ultimately if its not his pcv valve the motor is going to need to come apart for further inspection, at the very least the intake manifold removed so the runners in the cylinderhead can be inspected... Oil consumption repairs are not simple generally, so spending a bunch of time sort-of-diagnosing a problem when its going to be a 25hr+ job for joe schmoe in his driveway to repair something large like rings himself.

There are ways you can help narrow down where the oil is coming from by symptoms, load, startup, always, coasting, compression braking. all will help but ultimately if its not something like a pcv valve the motor is coming apart to one extent or another.

Also, dont get me wrong, I dont agree with it, but IIRC chryslers deturmination for excessive oil consumption is 1 qt per 1k miles and your 3 qts in 5k miles is below the "excessive" threshold.
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  #20  
Old 08-24-2011, 04:53 PM
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Re: Oil consumption

Is your 4.7 stock? My modify 4.7 loses almost 1 qt every time I take it to the track, but all of it goes to the catch can. I just got tire of messing with the PCV valves and installed a oil catch can instead.
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  #21  
Old 08-24-2011, 06:29 PM
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Re: Oil consumption

Thanks everybody for the help sofar. But.......... my 5 weeks ago rebuild tranny just gave up on me again with the same problem, 3rd gear clutch slipping..............
Jeep is back to the office and lets see what is wrong this time.
I think its time to dump it...................................
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  #22  
Old 08-25-2011, 05:02 AM
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Re: Oil consumption

Quote:
Originally Posted by Frango100 View Post
Thanks everybody for the help sofar. But.......... my 5 weeks ago rebuild tranny just gave up on me again with the same problem, 3rd gear clutch slipping..............
Jeep is back to the office and lets see what is wrong this time.
I think its time to dump it...................................
Dump it and get one w/ the reliable I6.
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  #23  
Old 08-25-2011, 10:41 AM
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Re: Oil consumption

Sofar the tranny shop has removed the tranny, but didn't open it yet. The only anomally he found sofar was some foam on the dipstick from the tranny and a higher then normal fluid level. I have never removed an automatic transmission, but could there be any oil transfer from the engine to the tranny, explaining the engine oil loss and tranny fluid rise?
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  #24  
Old 08-25-2011, 10:52 AM
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Re: Oil consumption

I believe it is possible it is possible but if you are noticing smoke from the exhaust I would lean towards the oil is burning off. Although if your increased oil consumption started after you had the tranny fixed recently it could just be a seal problem when they reinstalled the tranny. Unless the motor oil is fresh it would probably darken the tranny fluid, and the wrong oil definitely could cause the clutches to go bad. Good luck, sorry to hear you are having so many problems with the jeep!
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