Overheating Help!!!
Thread Starter
Newbie
Joined: May 2011
Posts: 17
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Model: Cherokee
You have a 2000. From the factory, your engine came with the infamous 0331 cylinder head. This head has a casting defect between cylinders 3-4, which can lead to cracking in that exact spot.
A cracked head can give you the symptoms you describe. On the 0331, the head cracks way more often than the head gasket fails.
If this were mine, I would pull the valve cover and with a good light, perform a thorough inspection between cylinders 3-4, as many times, the crack can be seen with the naked eye.
And you really need to read this thread on the 0331 head. It is "required" reading for anybody with an 00-01 XJ.
http://www.jeepsunlimited.com/forums...d.php?t=391831
A cracked head can give you the symptoms you describe. On the 0331, the head cracks way more often than the head gasket fails.
If this were mine, I would pull the valve cover and with a good light, perform a thorough inspection between cylinders 3-4, as many times, the crack can be seen with the naked eye.
And you really need to read this thread on the 0331 head. It is "required" reading for anybody with an 00-01 XJ.
http://www.jeepsunlimited.com/forums...d.php?t=391831
I read the thread and all seems to be pointing in this direction. I will take off the valve cover tomorrow and let you know the results.
Junior Member
Joined: Jan 2011
Posts: 35
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From: Las Vegas Nevada
Year: 1990
Model: Cherokee
Engine: 4.0
over heating
my bro's 2000 over heated on him got it home and checked it out found that the clutch fan went bad and it over heated. we got all the parts also found that the water pump impeller cracked from the heat. after all the parts where installed he hasnt had any more problems
Thread Starter
Newbie
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Model: Cherokee
my bro's 2000 over heated on him got it home and checked it out found that the clutch fan went bad and it over heated. we got all the parts also found that the water pump impeller cracked from the heat. after all the parts where installed he hasnt had any more problems
Thread Starter
Newbie
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Model: Cherokee
Took off the valve cover and could not see a visable crack @ cyl 3 & 4. This would lead me to believe this may be a head gasket issue. I will still have the head looked at and also do a visual inspection on the bottom side of the head for cracks or fatigue. I also drained the oil for signs of coolant. I noticed the oil was not black, but a caramel color is this a indicator that the head gasket blew? I'll post again when I get to that road. Thanks for your input!!!!
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Senior Member
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From: LARRYVILLE
Year: 1998
Model: Cherokee
Engine: 4.0
Originally Posted by dublup50
about 3 months ago. I will change with new oil at this time.
CF Veteran
Joined: Nov 2010
Posts: 5,840
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From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
When you run a compression test, low pressure on two adjacent cylinders is usually a blown head gasket.
And not ALL cracks on the 0331 are visible. Keep that in mind. This is a fragile head.
And not ALL cracks on the 0331 are visible. Keep that in mind. This is a fragile head.
CF Veteran
Joined: Mar 2010
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From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Newbie
Joined: May 2011
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From: Berne, Indiana
Year: 1993
Model: Cherokee
Engine: 4.0
if you don't find any cracks or anything like that, and it's still running hot, get some stuff called water wetter, or the royal purple equivalent, can't remember the exact name. the electric fan on my 93 doesn't work, and I notice when I sit for a few the temp starts to go up, I bought some of the royal purple coolant additive, and I stay right around 200-210...just an idea
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Model: Cherokee
I'm no expert, but at the suction end of the water pump, that line has one or two spring inside the tube to prevent it from collapsing under pressure. I read in other forums that shop mechanics make the mistake of not reinstalling these springs when replacing the water pump. Could that be the issue?
Thread Starter
Newbie
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Model: Cherokee
I'm with you on this. I have done many oil changes and have never had this color come out, only black. I will begin the disassembly of the head today.
Thread Starter
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Model: Cherokee
Thx, if the head has a crack after inspection. Are they repairable? If not, whats the best replacement new or refurbished? Or, is there an alternative head?