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Unread 02-11-2013, 11:22 AM   #1
LordWilmar
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2000 4.0 Heads question

Is there a way to tell, without removing the valve cover, if my 4.0 has the newer, non-cracking head?

Thanks!

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Unread 02-11-2013, 12:11 PM   #2
AZ Jeff
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Do a search on this forum and it will show you where you can see the letters "TUPY" cast into the head.

If you have an original engine in your 2000 model year, it won't have these letters.
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Unread 02-11-2013, 06:57 PM   #3
CJ7-Tim
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Open the oil filler cap on the valve cover. You should be able to see the TUPY inside. You may have to use some fuel injector cleaner to clear away any oil. Note the orientation and distance from the 0331, which can be seen near the valve cover bolt, on the outside edge of the head.

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0331-tupy-2.jpg  
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Unread 02-11-2013, 09:10 PM   #4
cruiser54
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Quote:
Originally Posted by CJ7-Tim View Post
Open the oil filler cap on the valve cover. You should be able to see the TUPY inside. You may have to use some fuel injector cleaner to clear away any oil. Note the orientation and distance from the 0331, which can be seen near the valve cover bolt, on the outside edge of the head.

.
Ever wonder what TUPY stands for? Is it an acronym?
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
Refresh*Connections*Before*Replacing*Components
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Unread 02-11-2013, 09:20 PM   #5
dmill89
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Quote:
Originally Posted by cruiser54 View Post
Ever wonder what TUPY stands for? Is it an acronym?
It is the name of the casting company that made the "revised" 0331 heads.

http://www.tupy.com.br/ingles/home/
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Unread 02-11-2013, 09:21 PM   #6
cruiser54
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Originally Posted by dmill89 View Post
It is the name of the casting company that made the "revised" 0331 heads.
Outside this country?
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
Refresh*Connections*Before*Replacing*Components
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Unread 02-11-2013, 09:28 PM   #7
dmill89
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Originally Posted by cruiser54 View Post
Outside this country?
Yes, it's a Brazilian company.
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Unread 02-12-2013, 09:25 PM   #8
dave564
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I was going to start a thread about the same thing.

I have a 2000 Cherokee with ZIP for oil pressure, and will be ordering a short block as long as this head checks out.

In my case I think very early on in the trucks life it cracked, wasted the cam bearings and a dealer just swapped the head. (I hope) I am going to run to the local dodge store this weekend and have the service guy punch it in the computer to see.

QUESTION was/is TUPY the only manufacturer that made the replacement head, or is there another out there?
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Unread 02-12-2013, 09:52 PM   #9
dmill89
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Quote:
Originally Posted by dave564 View Post
I was going to start a thread about the same thing.

I have a 2000 Cherokee with ZIP for oil pressure, and will be ordering a short block as long as this head checks out.

In my case I think very early on in the trucks life it cracked, wasted the cam bearings and a dealer just swapped the head. (I hope) I am going to run to the local dodge store this weekend and have the service guy punch it in the computer to see.

QUESTION was/is TUPY the only manufacturer that made the replacement head, or is there another out there?
TUPY was the OEM supplier of the "revised" 0331 heads for Jeep, if you pull a used head from a 02+ WJ (Grand Cherokee) or TJ (Wrangler) it will be a TUPY.

There are many other companies out there making replacement heads such as Clearwater Cylinder head if you want a new head.
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