Sludge in oil fill and cap!
- Thread starter Hubjeep
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I noticed this for the first time (actually the person changing the oil noticed it, I almost never pull the cap myself) in our 2000 Jeep GC 4.7L with over 100,000 miles. It was a thin layer of light yellow scum inside the cap and filler, which partly went away after driving awhile. You could also see water in the opening that leads to the PCV valve. I should note that the high temp today was in the 20s. It sounds from the discussion here that this might be "normal". How does one know for sure that there is no other problem? the oil on the dipstck appears normal. I imagine that it would also be wise to replace my PCV valve, as it is probably way overdue. Thanks in advance for any suggestions.
Seth
This time of year this type problem starts showing up. It's a good routine to clean out the breather tubes/hoses as well as cleaning out or replacing the pcv valve as well. I noticed that condensation in my oil fill neck last year, took off the breather tube and sprayed it out with carb cleaner and ran a coathanger through. Some gunk did come out and the condensation problem went away. I guess you could also wrap some insulation/towel around that neck too.
Thanks for the reply. I'm going to replace the PCV valve and hose this weekend, and see if it recurs.
Seth
Having a 4.7L and found that "stuff" in to oil fill neck. By removing the stock mech. fan and replacing with a electric fan has help a lot with that. It allows the filler neck (FN) to warm up and do away with the build up. The old fan was blowing COLD air over the FN and causing the build up. True this did not stop at 100% but it did help. Other 4.7L owners have wraped the FN so it will stay warmer.
Oil sludge in filler neck.
Ele. Fan
Oil sludge in filler neck.
Ele. Fan
IMHO, it's helping to correct a design weakness, and pretty ingenious, too. That filler neck is going to be the coldest part of the engine, where all the water will naturally condense. If you keep it warm, the water will stay in vapor form then migrate out through the PCV instead of collecting at the filler neck. I say good idea.
It doesn't hurt anything, so don't worry about it. There is a baffle form the dealer you can get for it. My 2003 Durango has the baffle and I see very little sludge in the neck.
Comman issue that comes up this time of year on many of the Dakota, Ram & Darango boards. Here some ifno for you ...
(sorry , I must edit out the non sponsor Amsoil link)
[ January 03, 2005, 12:04 PM: Message edited by: Patman ]
(sorry , I must edit out the non sponsor Amsoil link)
[ January 03, 2005, 12:04 PM: Message edited by: Patman ]
Sorry I some how missed some of the above postes.
But I'm going to insulate the filler neck and PVC hose some how, someday.
But I'm going to insulate the filler neck and PVC hose some how, someday.
You should be cleaning it out on a regular basis if you want room for more condensation to form. Otherwise your oil will load up with water. That's what happened to my air cooled Suzuki GS400. I was using it in the winter to take 2 km trips back and forth from University and after 700 km my oil would look like milk. You couldn't tell by checking the oil level. Anyway, I also started parking the bike inside at school instead of leaving it out in -30C temperatures. This helped a lot too.
Steve
Steve
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