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Unread 09-10-2013, 08:27 PM   #1
99wjmaverick
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2000 jeep grand cherokee high rpm rattle

Hello, i have a 2000 jeep grand cherokee 4.0, and at rpms over 2000 it rattles pretty bad and loses oil pressure once warmed up. it has 160,000 miles. Anyone have any idea whats wrong with it?

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Unread 09-11-2013, 02:24 PM   #2
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Unread 09-11-2013, 02:34 PM   #3
brouwmat
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Quote:
Originally Posted by 99wjmaverick
Hello, i have a 2000 jeep grand cherokee 4.0, and at rpms over 2000 it rattles pretty bad and loses oil pressure once warmed up. it has 160,000 miles. Anyone have any idea whats wrong with it?
I don't know what that one would be.. when you say "Rattle" what does it sound like? Any codes? don't rely on the idiot light.. hook it up to a computer and see if it has any codes there.
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Unread 09-11-2013, 04:28 PM   #4
99wjmaverick
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Alright, it almost sounds like something is in the fan.
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Unread 09-11-2013, 07:42 PM   #5
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Originally Posted by 99wjmaverick
Alright, it almost sounds like something is in the fan.
Clutch driven fan or electric fan? If it's the clutch driven fan that would be my guess..
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Unread 09-14-2013, 10:56 AM   #6
99wjmaverick
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electric fan.
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Unread 09-14-2013, 08:09 PM   #7
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Probably bearing on fan. Oil pressure can anything.
You can change oil and filter.
Test pressure with mechanical gauge.
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Unread 09-18-2013, 04:10 PM   #8
99wjmaverick
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I had somebody look at it and they said main bearings or cam bearings, anyone know how to find out which it is?
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Unread 09-18-2013, 08:38 PM   #9
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Sounds like cam bearings and the rattling is probably the lifters losing oil from lack of pressure.
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Unread 09-18-2013, 08:58 PM   #10
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Sounds like cam bearings and the rattling is probably the lifters losing oil from lack of pressure.
X2 if it were mains you'd here them
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Unread 09-18-2013, 09:10 PM   #11
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alright thanks. Would it be worth having the cam bearings replaced or find a junkyard engine?
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Unread 09-18-2013, 10:10 PM   #12
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Junkyard engines are hit or miss on whether they are good or bad.
If your gonna do the can bearings may as well rebuild the engine.
Craigslist is a good source for running engines.
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Unread 09-19-2013, 06:11 AM   #13
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if you don't have the ability to rebuild the engine yourself, I would look at a reman. Mine was about $1900 + install. Most junkyard engines worth anything are going to be in the same range + the same install. The reman comes with a 3yr Unlimited mileage warranty that may cover labor (depending on who you buy it from of course) where your junkyard motor will be lucky to have a 1yr parts warranty.
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Unread 09-20-2013, 05:36 AM   #14
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X2 on the reman. You can't beat the price plus you get a warranty.
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