Wanted: 4.0L TUPY cylinder head

[V]

I need a 4.0L head from a 2003-2004 TJ or WJ/WG.

 

The TUPY head is a revision of the 0331 that has the coil pack bosses but without the cracking problem.

If you look down the oil filler hole you will see the word 'TUPY' cast into the top surface of the head between No.3 and 4 exhaust rockers.

 

I don't need another time bomb 0331 from 2000-2001, but I will consider a 7120 from 1991 to 1995 or a 0630 from 1996-1999. I have a spare exhaust manifold that matches these earlier heads but I will need to engineer a solution to add the coil packs and I will also need a new custom exhaust down pipe to join to my existing custom system. A TUPY head is a bolt on.

[TimC]

49 minutes ago, V said:

I need a 4.0L head from a 2003-2004 TJ or WJ/WG.

 

The TUPY head is a revision of the 0331 that has the coil pack bosses but without the cracking problem.

If you look down the oil filler hole you will see the word 'TUPY' cast into the top surface of the head between No.3 and 4 exhaust rockers.

 

I don't need another time bomb 0331 from 2000-2001, but I will consider a 7120 from 1991 to 1995 or a 0630 from 1996-1999. I have a spare exhaust manifold that matches these earlier heads but I will need to engineer a solution to add the coil packs and I will also need a new custom exhaust down pipe to join to my existing custom system. A TUPY head is a bolt on.

 

Good grief Vince! Where on earth do you get all this info from and where do you store it all! This is encyclopedic! 

[V]

OK, you got me.

My hands are up.

I'll confess.

I'm a Cherokee nerd.

[TimC]

I would never have guessed! 

[UKTJ]

On 14/06/2022 at 13:29, V said:

I need a 4.0L head from a 2003-2004 TJ or WJ/WG.

 

The TUPY head is a revision of the 0331 that has the coil pack bosses but without the cracking problem.

If you look down the oil filler hole you will see the word 'TUPY' cast into the top surface of the head between No.3 and 4 exhaust rockers.

 

I don't need another time bomb 0331 from 2000-2001, but I will consider a 7120 from 1991 to 1995 or a 0630 from 1996-1999. I have a spare exhaust manifold that matches these earlier heads but I will need to engineer a solution to add the coil packs and I will also need a new custom exhaust down pipe to join to my existing custom system. A TUPY head is a bolt on.

If a 2000-2001 has an 0331 and a 2003-2004 has a TUPY, what does a 2002 have?  Curious as, you guessed it, my 4.0l TJ is a 2002.

[V]

The 2002 has either. The TUPY head was introduced late in 2002. I don't know which month exactly. Shine a light in the oil filler cap and have a look. From memory, UK Wrangler stock was moving very slowly in 2002 and there was a large number of unsold pre-ordered vehicles parked up in storage fields for quite some time. I am not entirely certain, but I think the dealers had to pre-order to hold in stock one or two Wranglers a year but something like only 50 were sold.

 

I hope you are lucky and have a TUPY head otherwise you are in the same boat as me. My 2001 XJ has just done 100K miles. It is not overheating, performance is fine, and I don't have emulsified oil. However, my coolant level is dropping slowly. This could be a small leak from my radiator, hose or water pump which is not obvious at the moment due to the general light earth colour of every surface under the bonnet.

[digger]

Hi V, sorry I missed you today. I may be able to go again on Sunday or one day next week.

[V]

No problem. I am just trying to be proactive to have a head ready to swap in. Used 4.0L Jeep parts are becoming very scarce and the prices have shot up in a lot of areas. The cheapest I can get the bare Chinese head for is £260 delivered from France.

[V]

I am still looking for a TUPY head for convenience, but I am leaning more towards a 7120 from 1991-1995 for a long term fitment.

 

I now have a solution/upgrade for the 2001 coil pack - getting rid of it!. A popular reliability upgrade for the later 4.0L engines that have the coil-on-plug rail is to convert them to use a Dodge Viper coil (or V6 Dodge Caravan coil). This coil is an electronically controlled six electrode sequential firing coil. It requires plug leads but works with the distributorless ignition system using the same wiring.

 

I have a spare manifold for a 7120 so I would just need to make a 2.5" diameter downpipe to connect it to the custom made exhaust system on my 2001 XJ. Most XJ Cherokees have a 2.25" exhaust system. The advantage of using the 7120 is that it is the same head model on my 1993 XJ. When collecting spares for use after 2030, I only need to find a spare 1991-1995 4.0 engine.

[digger]

I am going near  to my favourite scrappie on Tuesday next week. I will take a look then.

[JimC]

13 hours ago, digger said:

I am going near  to my favourite scrappie on Tuesday next week. I will take a look then.

Any photos of Jeep Junkyard Gems would be great.
Great to know what is in the junkyards should any members be looking for parts and also for historical reasons

 

[UKTJ]

Resurrecting this thread as I realise there is a gap in my understanding.  The TUPY head in the OP is from an '03 - '04, but what about after 2004?  Was there another change that means a 2005 head will not work with a pre 2005 4.0l engine?

[V]

TUPY heads were made right up to 2006 for TJ Wranglers but they rarely pop up as a used part. It is easier to find a TUPY head from a 2003-2004 WJ/WG Grand Cherokee due to the larger quantity that were built. I was being lazy in my original post not showing both model ranges.

 

2003-2004 WJ/WG

2003-2006 TJ

 

[V]

I am getting the parts together to convert my 4.0L 2001 XJ from an 0331 to 7120. I have both manifolds now and some of the Viper coil conversion parts so it will be distributorless but with spark plug leads.

[UKTJ]

5 minutes ago, V said:

I am getting the parts together to convert my 4.0L 2001 XJ from an 0331 to 7120. I have both manifolds now and some of the Viper coil conversion parts so it will be distributorless but with spark plug leads.

Sounds like an interesting project.  I guess this means the search for the TUPY head was fruitless.

[V]

The TUPYs that I found all came with a 4.0L engine. If Jeep had not decided to make WJ/WG block different to the XJ block, a spare engine would be useful if I had the space. However, a WJ block requires custom engine mounts on a XJ. It's been done in the USA on LHD XJ but it's less than ideal and not recommended. The RHD XJ has less space due to the steering shaft and the right hand engine mount is unique to RHD XJs, it's a project I'm not interesting in being a guinea pig for until after 2030 and options become limited.

 

[UKTJ]

46 minutes ago, V said:

The TUPYs that I found all came with a 4.0L engine. If Jeep had not decided to make WJ/WG block different to the XJ block, a spare engine would be useful if I had the space. However, a WJ block requires custom engine mounts on a XJ. It's been done in the USA on LHD XJ but it's less than ideal and not recommended. The RHD XJ has less space due to the steering shaft and the right hand engine mount is unique to RHD XJs, it's a project I'm not interesting in being a guinea pig for until after 2030 and options become limited.

 

Ah, so even if you find a possible candidate, scrap yards only want to sell the engine complete.  I guess that makes sense as it may be hard to sell everything except the cylinder head.

Edited January 1 by UKTJ
Missing comma

[V]

You may be lucky with a TJ block. I think the TJ mount holes are in the WJ block.

[UKTJ]

11 hours ago, V said:

You may be lucky with a TJ block. I think the TJ mount holes are in the WJ block.

I just don't have the space to store a spare engine, just in case.  So if that is the only way to get a TUPY head I will have to keep my fingers crossed and deal with it if the need ever arises.

[V]

I don't have any actual evidence, but I suspect that the Chinese made 4.0L cylinder heads are the same as the TUPY head developed from genuine Chrysler patterns licensed to Beijing Jeep. As with a lot of Chinese manufacturing subcontracted out to a smaller specialist, they continued making them after the contract ended. I suspect that the Chinese foundry makes all of the after-market '0331' replacement 4.0L heads including the 'Clearwater' but not the Edlebrock performance head.

[UKTJ]

3 hours ago, V said:

I don't have any actual evidence, but I suspect that the Chinese made 4.0L cylinder heads are the same as the TUPY head developed from genuine Chrysler patterns licensed to Beijing Jeep. As with a lot of Chinese manufacturing subcontracted out to a smaller specialist, they continued making them after the contract ended. I suspect that the Chinese foundry makes all of the after-market '0331' replacement 4.0L heads including the 'Clearwater' but not the Edlebrock performance head.

OK, if that is the case if it ever comes to it maybe a new Chinese one is a better option than a reclaimed one from a scrapper?!?