Looking for definitive answer on engine compatability
07-24-2019, 01:24 PM
#1
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Year: 1999
Model: Cherokee
Engine: 4.0 L 6 cyl.
Looking for definitive answer on engine compatability
Hi y'all.
I have 2 Grand Cherokee Laredos.
1 is an 04 with the 4.0 straight 6
2 is an 02 with the 4.0 straight 6
The 02's engine has a cracked head. The 04's head is good. The 04's block is crap. The 02's block is good.
My question is... Can I bolt my 04's head onto my 02's block without any problems?
The reason I ask is, because the frame on my 04 is broke. The 02 has almost zero rust.
I have 2 Grand Cherokee Laredos.
1 is an 04 with the 4.0 straight 6
2 is an 02 with the 4.0 straight 6
The 02's engine has a cracked head. The 04's head is good. The 04's block is crap. The 02's block is good.
My question is... Can I bolt my 04's head onto my 02's block without any problems?
The reason I ask is, because the frame on my 04 is broke. The 02 has almost zero rust.
07-24-2019, 01:58 PM
#2
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Year: 2000
Model: Cherokee (XJ)
Yes.
Will be a straight bolt on.
Guessing your '02 was made early in the year so it has the 0331 head in it.
When you take the valve cover off the '04 you will see the letters TUPY.
I think people say that you could see the letters through the oil filler cap.
It is still a 0331 head just the improved version.
Some '02's made later in the year will have the TUPY head.
And the rest of the WJ's from that point on.
Will be a straight bolt on.
Guessing your '02 was made early in the year so it has the 0331 head in it.
When you take the valve cover off the '04 you will see the letters TUPY.
I think people say that you could see the letters through the oil filler cap.
It is still a 0331 head just the improved version.
Some '02's made later in the year will have the TUPY head.
And the rest of the WJ's from that point on.
07-24-2019, 02:19 PM
#3
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Year: 1999
Model: Cherokee
Engine: 4.0 L 6 cyl.
Yes.
Will be a straight bolt on.
Guessing your '02 was made early in the year so it has the 0331 head in it.
When you take the valve cover off the '04 you will see the letters TUPY.
I think people say that you could see the letters through the oil filler cap.
It is still a 0331 head just the improved version.
Some '02's made later in the year will have the TUPY head.
And the rest of the WJ's from that point on.
Will be a straight bolt on.
Guessing your '02 was made early in the year so it has the 0331 head in it.
When you take the valve cover off the '04 you will see the letters TUPY.
I think people say that you could see the letters through the oil filler cap.
It is still a 0331 head just the improved version.
Some '02's made later in the year will have the TUPY head.
And the rest of the WJ's from that point on.
07-24-2019, 02:29 PM
#4
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Year: 2000
Model: Cherokee (XJ)
07-24-2019, 02:29 PM
#5
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Year: 1999
Model: Cherokee
Engine: 4.0 L 6 cyl.
Deteted post
Yes.
Will be a straight bolt on.
Guessing your '02 was made early in the year so it has the 0331 head in it.
When you take the valve cover off the '04 you will see the letters TUPY.
I think people say that you could see the letters through the oil filler cap.
It is still a 0331 head just the improved version.
Some '02's made later in the year will have the TUPY head.
And the rest of the WJ's from that point on.
Will be a straight bolt on.
Guessing your '02 was made early in the year so it has the 0331 head in it.
When you take the valve cover off the '04 you will see the letters TUPY.
I think people say that you could see the letters through the oil filler cap.
It is still a 0331 head just the improved version.
Some '02's made later in the year will have the TUPY head.
And the rest of the WJ's from that point on.
Last edited by bigbernie; 07-24-2019 at 02:34 PM.
07-24-2019, 02:32 PM
#6
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Year: 1999
Model: Cherokee
Engine: 4.0 L 6 cyl.
How do I know when it was made. I'm asking because I'm being told that the gasket set I want is compatible with the 02 but not the 04
07-24-2019, 02:50 PM
#7
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Year: 2000
Model: Cherokee (XJ)
By the way this is the XJ section and you really want to ask this question in the WJ section.
I just happen to know the answer because I have a TUPY head from a '04 WJ as a back up for my '00 XJ.
I went to take a look at Napa online for both vehicles.
They do ask for a letter from the VIN for both '02 and '04.
I went back and forth trying both years with both letters and I come up with FPG 26211PT.
Wondering if they are looking up the part wrong. V8 for one and the straight six for the other.
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07-25-2019, 03:52 AM
#8
Old fart with a wrench
There should be no difference in head gaskets for a 4.0L except early ones don't have dowel pin locators in the block for the head, but can still use late model gaskets. There's nothing the 04 has that the 02 doesn't. Well, maybe thickness. Don't be going with a thicker gasket! It can change your lifter preload.
Last edited by dave1123; 07-25-2019 at 04:00 AM.
07-25-2019, 08:07 AM
#9
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