Cylinder head
03-03-2019, 09:52 AM
#1
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L I6
Cylinder head
Hey guys, so I went to do an oil change yesterday and notice a lot of sludge in my cylinder head. I have a 1990 XJ that i bought used, and I've notice that the cylinder head has the 0331 stamp. I know this is the one that is notorious for cracking between #3 and #4, but I thought they were only used in the 99-00 models. Anyway I'm pretty sure its cracked and coolant is seeping in. So I want to buy a replacement head, but dont know what to buy? Im not the best at mechanics so I dont know if there had to be mods done to fit the 0331 in my jeep in the first place. Is it possible that I could just get the reinforced 0331 from Clearwater, and it would fit the same as the old 0331? Or should I be trying to find the head made for the 90 renix?
03-03-2019, 10:12 AM
#2
CF Veteran
The 0331 problem was 2000-2001, maybe some 99s.
https://www.cherokeeforum.com/how-to...rmation-398176
These also didn't have distributors anymore, so IMO stick to a straight up replacement.
https://www.cherokeeforum.com/how-to...rmation-398176
These also didn't have distributors anymore, so IMO stick to a straight up replacement.
03-03-2019, 10:15 AM
#3
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L I6
Well I have a 1990 with the 0331 head and its cracked. There's a lifter tick and sludge build up. I just want to know if I can get the 0331 Clearwater replacement head. I must be able to since the 0331 is in the truck right now
03-03-2019, 12:01 PM
#5
CF Veteran
Oh wait-- what's the serial number of the engine?
03-04-2019, 05:27 AM
#7
CF Veteran
Certainly the best place to start (find out what needs fixing before you try to fix it).
OP previously posted that he has a distributor, so the engine is a hybrid. The 0331 head could be a bad 0331, a good 0331 (TUPY), or even a Clearwater et al.
And cracked or not. Could just be a head gasket.
IMO OP needs to identify block:
If the existing head is bad, find out what head is SUPPOSED to be there.
Then find out what mods (if any) were done.
Then review options, perhaps considering going to 7120s.
OP previously posted that he has a distributor, so the engine is a hybrid. The 0331 head could be a bad 0331, a good 0331 (TUPY), or even a Clearwater et al.
And cracked or not. Could just be a head gasket.
IMO OP needs to identify block:
4.0 Engine date codes
The date code is on the passenger side of the engine, on the block, just forward and up from the distributor on a machined flat surface.
The digits of the code identify:
1st Digit-The year (8 = 1998).
2nd & 3rd Digits-The month (01 - 12).
4th & 5th Digits-The engine type/fuel system/compression ratio (MX = A 4.0 Liter (242 CID) 8.7:1 compression ratio engine with a multi-point fuel injection system).
6th & 7th Digits-The day of engine build (01 - 31).
1. FOR EXAMPLE: Code * 801MX12 * identifies a 4.0 Liter (242 CID) engine with a multi-point fuel injection system, 8.7:1 compression ratio and built on January 12, 1998.
The date code is on the passenger side of the engine, on the block, just forward and up from the distributor on a machined flat surface.
The digits of the code identify:
1st Digit-The year (8 = 1998).
2nd & 3rd Digits-The month (01 - 12).
4th & 5th Digits-The engine type/fuel system/compression ratio (MX = A 4.0 Liter (242 CID) 8.7:1 compression ratio engine with a multi-point fuel injection system).
6th & 7th Digits-The day of engine build (01 - 31).
1. FOR EXAMPLE: Code * 801MX12 * identifies a 4.0 Liter (242 CID) engine with a multi-point fuel injection system, 8.7:1 compression ratio and built on January 12, 1998.
Then find out what mods (if any) were done.
Then review options, perhaps considering going to 7120s.
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