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Unread 01-22-2006, 02:21 PM   #1
mike481
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2000 TJ Wrangler 
 
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Is my brand new engine a bust?

I just got my jeep back after 2 months at the dealership. I took it in because of low oil pressure and coolant in the oil (I figured a bad head gasket or cracked head at worst). Turned out the head was craced and block had problems so they ordered me a new engine.

After i drove it away on friday I noticed that the oil pressure was acting the same way it was when I took it in.

My question is what is normal operating oil pressures:

4.0 engine-
@start-up 45psi.
@idle after reahing full operating temp. 18-20psi
@2,000 rpm 40psi

Do these numbers seem normal or am I correct to worry?

Mike

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Unread 01-22-2006, 02:46 PM   #2
Test
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That looks about right to me. May read lower at idle than at higher rpms. Although mine stays about the same all the time.
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Unread 01-22-2006, 02:53 PM   #3
XJ4oh
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Is that tested with a mechanical guage, or the dash guage? The dash guage is known to suck and be inaccurate at times. They seem normal, 12psi is minimum for a hot idle, and your above that.. so, sounds OK. Is there a warentty on the new engine id hope?
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Unread 01-22-2006, 07:47 PM   #4
mike481
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There is a 30k waranty on the engine.

I read the oil pressure off the gauge. However, when I originally took the jeep in the dealership told me the gauge was correct when compared to a seperate pressure tester.
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Unread 01-22-2006, 08:03 PM   #5
XJ4oh
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As long as you have a warrenty i'd give it some time and see what it does.. they dont really sound that low. Ive had mine dip to 12 psi before, at idle. Very hot summer day, temp was around 215 or so on the guage. Keep an eye on it, see what it does.

Do you mind me asking what happened to the origional engine?
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'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD
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Unread 01-22-2006, 10:20 PM   #6
mike481
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I originally noticed that my temp was getting up around 230 deg. and I was losing coolant. Then I noticed that my oil pressure seemed to be dropping. I checked the oil and it looked thin so I figuered it was coolant in the oil.

It took the dealership 2 months to figure out what was wrong and get me a new engine. Thank god I had a waranty
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Unread 01-24-2006, 08:00 PM   #7
bobjp
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Those seem a bit low, but not too bad. I would give it time to see what happens.
I would have been pretty annoyed with the dealer if it took two months to install an engine. They were just pushing you back because you were warranty work.
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Unread 01-25-2006, 10:28 PM   #8
stonehogg
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okkkkkkk

1. did you look under the hood to see if they in fact.. changed the engine ?
dealerships are morons on their best days... i could really see..." oh..gee.. i thought
you changed that engine ralph..." No ernie..i thought you did it...

2. your oil senser have a hollow tube that the pressure goes thru ? if so its probably clogged.. did you check to see if they reused the old oil sensor ? its either the sensor, the tube ( if you have one) going to the gauge.
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