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Old September 30th, 2012, 05:29 PM   #1
98ZJ318
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Condensation or Cracked Head?

My brother was checking fluids in his 2000 XJ when he took the oil cap off and found this....It hasn't over heated in the 5/6 months he's owned it but she does drink a bit of coolant ive noticed...so whats your guys's thoughts..
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Old September 30th, 2012, 05:59 PM   #2
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how often does he drive it and for how many miles per trip? lots of short trip driving where the engine never fully heats up will cause that. i would do a cylinder leak down test to check the integrity of the head and head gasket. certain year 4.0s have been known to crack the head between the valves or between the chamber and bolt holes.
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Old September 30th, 2012, 06:03 PM   #3
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Doesn't drive alot, i think he drives 12 miles a day to and from work. The 2000-2001s 4.0(0331 head casting) and its going in the shop for a compression test this week and we'll go from there. Looks like condensation but with bad luck it could be a cracked head. Shes using coolant and its not leaking so thats what got him worried about it being cracked
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Old September 30th, 2012, 06:21 PM   #4
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How much coolant is a bit?
With a 12 mile run of starting and jumping in and going, it could be just condensation.
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Old September 30th, 2012, 06:40 PM   #5
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Quote:
Originally Posted by Shotgun View Post
How much coolant is a bit?
With a 12 mile run of starting and jumping in and going, it could be just condensation.
He usually keeps an eye on it and checks it every week. So within a weeks time itll drop to the "add" mark on the reservoir. My 96 never has that build up?
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Old September 30th, 2012, 06:57 PM   #6
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If it is losing that much coolant and you assume it is ending up in the crankcase it would show up on the dipstick when you check the oil.........if it doesn't then probably condensation causing the sludge on the oil cap......
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Old September 30th, 2012, 06:59 PM   #7
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Head is cracked. If you have a coolant pressure tester put pressure to it and look down through the oil cap hole and you will be able to see coolant coming up through a crack in the head.
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Old September 30th, 2012, 07:22 PM   #8
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He plans on dropping it off and getting a compression test done and i will recommend he gets the coolant pressure test done. Now if the head is cracked, wouldnt he be dropping oil pressure? Thanks for the tips btw
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Old September 30th, 2012, 09:57 PM   #9
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CO dectector (sparge type) is an excellent way of detecting small cracks or head gasket leaks. I use mine all the time when the pressure test results are inconclusive.
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