Do all Jeep 4.0 long blocks interchange? - Page 2 - JeepForum.com

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post #16 of 25 Old 03-10-2017, 12:14 PM
bobthecatkiller
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Quote:
Originally Posted by bluejunior View Post

If you're willing to do some parts diving, you can get yourself a TUPY head to fix the 0331 issue, and you can delete the cali emissions (I think that's legal to talk about here since you're modifying your original emissions anyway) but the 95 is less work to be reliable. The 95 doesn't have the better intake/ignitiom so it puts out a smidge less, will use a bit more gas and has a distributor to mess with so that's the tradeoff.
I'm not talking about Cali emissions of course you can delete that but the exhaust ports are different so you can't use your old headers as far as I know it won't line up, you can however use a older head and your existing exhaust.


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post #17 of 25 Old 03-10-2017, 12:47 PM
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Originally Posted by bobthecatkiller View Post
I'm not talking about Cali emissions of course you can delete that but the exhaust ports are different so you can't use your old headers as far as I know it won't line up, you can however use a older head and your existing exhaust.
The older style header may not work. I believe the '00-'01 has two pre-cats. I believe you may be able to use an older style head though. Either you would need to use an older style header and down pipe, thus deleting the two pre-cats. Not good in an emissions state. The other possibility is to search E-Bay for a '00-01 header. They should cover the older ports and connect to the pre-cats. Not 100% sure, so check on it first.
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post #18 of 25 Old 03-10-2017, 01:32 PM
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Originally Posted by 75SV1 View Post
The older style header may not work. I believe the '00-'01 has two pre-cats. I believe you may be able to use an older style head though. Either you would need to use an older style header and down pipe, thus deleting the two pre-cats. Not good in an emissions state. The other possibility is to search E-Bay for a '00-01 header. They should cover the older ports and connect to the pre-cats. Not 100% sure, so check on it first.
Edit: nvm I can't read, your right except the newer manifolds won't work on older heads.

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post #19 of 25 Old 03-10-2017, 05:50 PM
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Edit: nvm I can't read, your right except the newer manifolds won't work on older heads.
The newer 'stock' exhaust manifolds won't. They are cast iron. I am not sure about the aftermarket 'headers'. I see sets on E-Bay that look like regular headers, but come down to two pipes, one for each cat. I think they would/might have enough ID on the runner tubes to cover earlier exhaust ports.
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post #20 of 25 Old 03-19-2017, 10:33 PM
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This is a very informative discussion and altho I know zero about long block/short block/head stuff I understand a little bit of what is being said here. But only a little. I'm going to piggyback on this thread because my question is entirely relevant to the discussion. Forgive me if my question lays bare my ignorance for all to see, but I have to ask so that I can fully understand. All the talk about TJ/YJ and other non-XJs have me a little bit confused so I'll address my specific issue.

So ... will the full engine (long/short block) from a 1992 XJ swap over to a 2001 XJ? I would not be doing the work myself, and not entirely sure that it will come down to an engine swap, but I need to be prepared. School me like I'm 6 years old.

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post #21 of 25 Old 03-20-2017, 01:19 AM
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What is the difference between a short block and a long block? I've been hearing that for years and never know what people are talking about.

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post #22 of 25 Old 03-20-2017, 01:28 AM
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BTW - regarding changeover year from distributor cap to coil-on-plug...

I've always heard that 99 was the changeover year, and that early 99 (like mine) are like 98 and have a distributor cap; and late 99 have coil-on-plug.

I learned this when shopping for upgrade fuel injectors. 98 uses one part number injector, 2000+ uses another injector that is different because of something to do with coil-on-plug ignition in 2000. And for 99 XJs like mine, I had to specify whether mine was an early 99 with distributor cap, or a late 99 with coil-on-plug.

None of this matters to anyone, unless you have a 99 XJ. If you have a 99 it matters with regard to ignition system and compatible injectors. I'm basing that on my vague memory of these topics.

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post #23 of 25 Old 03-20-2017, 05:09 AM
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The 92 to 01: It would 'swap over. Some problems though. First is emissions.. The 00 and 01 have Pre-Cats. You might be able to use an after market header to cover the larger ports on the '92 head. There is an extra temp sensor in the '92 head. leave it in there , just no wire connected to it. Legally, you are only suppose to only use engine latter than your model number.


As to long block vs short block. Traditionally, a short block was without the head. Long block comes with the head. I'd also consider both without oil pan , valve cover and some other stuff. Those items would be engine complete. I only found one place that sells a short block for Jeep 4.0L. Maddco in TX. If any others chime in. I had a crank go bad, so looking at my options. Presently, I'll be putting in a used crank from an '00 or '01.
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post #24 of 25 Old 03-20-2017, 11:13 AM
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Quote:
Originally Posted by Cherokeegrrl View Post
So ... will the full engine from a 1992 XJ swap over to a 2001 XJ ?
Bolt right in with no changes at all ? No it won't. The engine block and all the internal parts will swap, one would then need to remove and re-use all of the 2001 specific parts as needed or required from your original 2001 engine: Intake/Exhaust manifolds, flex plate/flywheel, cylinder head, distributor-less ignition or distributor assembly, engine sensors, fan belt driven accessories and/or mounting brackets.


Assuming the 0331 head has cracked and this is the reason you need an engine swap, you would want to find a suitable 0331 head in good condition.


Short Block Engine

Short block engines are not complete but they do come with a cam shaft, pistons, connecting rods, and a crank. They do require the installation of additional internal parts which include but are not limited to: an oil pump, cylinder heads and gaskets. Some short blocks are made available with camshafts and timing parts.


Long Block Engine

This type of engine is almost complete and comes with the head which is bolted to the short block. The long block engine will need to have some additional external parts installed. These parts include but are not limited to: valve covers, manifolds for the exhaust and intake, a timing covers and an oil pan.

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post #25 of 25 Old 03-20-2017, 10:37 PM
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Appreciate the info - thank you!
Now can anyone tell me, what are the symptoms of a cracked head? And does anyone have a pic of a cracked head just so I can get a feel for what to look for?
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