Cylinder head question????
12-07-2010, 08:03 PM
#3
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Year: 1997
Model: Cherokee
Engine: 4.0L
which might be a good thing. It's rumored that the bosses for mounting the coils could be the reason the heads tend to crack on 99+ models.
The head will work but I think there is a coolant port that needs to be opened up or closed- I can't remember. But my brother did put one on his 2000 TJ and the machine shop that did the work fixed the head up correctly. He was going to make brackets for the coils (since the 92 head doesn't have any) but he has still yet to get around to doing it. Been with out mounting for two years now...
I've been told the '92 head will "flow" better too, but my brother didn't notice any improvement.
The head will work but I think there is a coolant port that needs to be opened up or closed- I can't remember. But my brother did put one on his 2000 TJ and the machine shop that did the work fixed the head up correctly. He was going to make brackets for the coils (since the 92 head doesn't have any) but he has still yet to get around to doing it. Been with out mounting for two years now...
I've been told the '92 head will "flow" better too, but my brother didn't notice any improvement.
12-08-2010, 06:20 AM
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Year: 1997
Model: Cherokee
Engine: 4.0L
And just so you know, if you're driving around with the cracked head problem you'll probably need a complete rebuild of the engine anyways because the coolant is damaging the bearing, as was the case with my brother's Jeep.
And the modification is very simple.
And the modification is very simple.
12-09-2010, 02:21 AM
#6
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Year: 1988
Model: Cherokee
Engine: AMC242
The 1992 will have the 7120 head, and the 2000 will have the 0331.
You'll have to fabricate brackets to retain the coil rail (anchor using valve cover screws,) and you'll also need to fabricate an adapter plate to make sure the exhaust ports are covered by the header primaries (easiest way to do that is to use sheet steel and cut it to the shape of the exhaust gasket for the 2000 - then use the 2000 manifold gasket on the manifold side and the 1992 manifold gasket for the cylinder head side.)
And, you'll either leave the temperature sensor in place on the rear of the head, or remove it and install a 1/8" NPT pipe plug in its place.
Apart from that, it's no more difficult than a straightforward head swap. If you want to avoid the conversion trouble, look for a 2002-up #0331 head with "TUPY" cast into the upper surface under the valve cover - this is the revised casting that shouldn't crack.
12-09-2010, 07:05 AM
#7
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Year: 1994
Model: Cherokee
Engine: 4.0
Yes, but not directly.
The 1992 will have the 7120 head, and the 2000 will have the 0331.
You'll have to fabricate brackets to retain the coil rail (anchor using valve cover screws,) and you'll also need to fabricate an adapter plate to make sure the exhaust ports are covered by the header primaries (easiest way to do that is to use sheet steel and cut it to the shape of the exhaust gasket for the 2000 - then use the 2000 manifold gasket on the manifold side and the 1992 manifold gasket for the cylinder head side.)
And, you'll either leave the temperature sensor in place on the rear of the head, or remove it and install a 1/8" NPT pipe plug in its place.
Apart from that, it's no more difficult than a straightforward head swap. If you want to avoid the conversion trouble, look for a 2002-up #0331 head with "TUPY" cast into the upper surface under the valve cover - this is the revised casting that shouldn't crack.
The 1992 will have the 7120 head, and the 2000 will have the 0331.
You'll have to fabricate brackets to retain the coil rail (anchor using valve cover screws,) and you'll also need to fabricate an adapter plate to make sure the exhaust ports are covered by the header primaries (easiest way to do that is to use sheet steel and cut it to the shape of the exhaust gasket for the 2000 - then use the 2000 manifold gasket on the manifold side and the 1992 manifold gasket for the cylinder head side.)
And, you'll either leave the temperature sensor in place on the rear of the head, or remove it and install a 1/8" NPT pipe plug in its place.
Apart from that, it's no more difficult than a straightforward head swap. If you want to avoid the conversion trouble, look for a 2002-up #0331 head with "TUPY" cast into the upper surface under the valve cover - this is the revised casting that shouldn't crack.
I love it when somebody actually KNOWS the answer. This stuff ought to be stored somewhere other than this posters memory. Well done.
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12-09-2010, 08:51 PM
#9
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Year: 1988
Model: Cherokee
Engine: AMC242
Gimme time - I'm workin' on it! That, and I'm negotiating to get the Power Manual printed by someone other than me...
Are you trying to overhaul a head to have handy in case yours cracks (typically 150-180Kmiles for non-TUPY #0331 heads - right between #3 and #4 cylinders, up top, under the oil filler cap...) or do you have a performance goal in mind?
12-10-2010, 07:37 AM
#10
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Year: 2000
Model: Cherokee
Engine: 4.0L
My jeep has 220000 miles and the valve train is noisey as hell. I want to rebuild a head and swap it out before any actual damage happens.
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