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Unread 06-07-2012, 06:35 PM   #1
94Jeap
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Engine interchange?

can any one tell me what the differences are be tween a 94 gc 4.0 engine, and later 4.0 engines?

the reason I'm asking is that i'm looking for a used engine for a 94, and I've found a good price on a 98 engine. the salvage yard tells me that the two engines won't match.

I was wondering if the main difference is distributorless ignition on the later engine, and could I just pull the cam sensor and install the distributor in its place? Or am I overlooking a larger fitment problem? (possibly a firing order change, coolant flow changes, missing bolt holes etc...)

Has anyone used the later engine in the earlier body?

any help is appreciated

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Unread 06-07-2012, 07:16 PM   #2
Jerbear0612
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They should fit fine as long as both engine were backed by the same tranny
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Unread 06-07-2012, 07:18 PM   #3
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98 has the obdII I don't think the 94 had it.
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Unread 06-07-2012, 07:27 PM   #4
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Quote:
Originally Posted by gactech
98 has the obdII I don't think the 94 had it.
No car had obdII until 96.
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Unread 06-07-2012, 08:01 PM   #5
edpmedic
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That's true I think you would need to change wire harness computer and some other stuff. It could be s nightmare. Maybe out would be easier to rebuild yours, what's wrong with it?
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Unread 06-07-2012, 09:35 PM   #6
SchizophrenicMC
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I don't see why a 98 engine would be different from a 97 engine, which I know is identical to a 94 engine. Am I missing something here?
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Unread 06-07-2012, 10:12 PM   #7
rm2001wj
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Quote:
Originally Posted by 94Jeap View Post
can any one tell me what the differences are be tween a 94 gc 4.0 engine, and later 4.0 engines?

...............

I was wondering if the main difference is distributorless ignition on the later engine, and could I just pull the cam sensor and install the distributor in its place? ............

...............
Distributorless ignition was not used until the 99 and later WJs. So that won't be a problem.
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Unread 06-07-2012, 10:33 PM   #8
CJ7-Tim
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1990-2001 XJ Cherokee and 1993-1998 ZJ Grand Cherokee engine blocks interchange. Simply remove and re-install on the door engine block the original intake/exhaust, head, fan belt driven accessories, motor mounts, transmission, OBD sensors, distributor, flywheel/flexplate, or other required original parts, as needed.

2000+ TJ and any WJ engines do not interchange and will not fit.

The junkyard is talking about a 100% bolt in engine swap.
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Unread 06-07-2012, 10:57 PM   #9
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2000 & 2001 xj motors, 1999-2006 tj motors, 1999-2004wj motors will not fit due to using different motor mounts on the block.
A 1998 zj motor will bolt on, but the flex plate and many sensors are different.
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Unread 06-07-2012, 10:59 PM   #10
SchizophrenicMC
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Quote:
Originally Posted by CJ7-Tim View Post
1990-2001 XJ Cherokee and 1993-1998 ZJ Grand Cherokee engine blocks interchange. Simply install the original intake/exhaust, head, fan belt driven accessories, motor mounts, transmission, OBD sensors, distributor, flywheel, or other required original parts, as needed, onto the donor engine block.

2000+ TJ and any WJ engines do not interchange and will not fit.

The junkyard talking about a 100% bolt in engine swap.
See, that's what I was thinking. Of course, my swapping experience is mostly with Nissans, so while I'm familiar with them, I don't know all the nuances of Jeeps.
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Unread 06-08-2012, 10:22 AM   #11
CJ7-Tim
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Rat,
2001-01 XJ engine block are compatible and will interchange with any 1990-2001 XJ Cherokee and with any 1993-1998 ZJ Grand Cherokee engine blocks.
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Unread 08-31-2012, 07:40 AM   #12
hautewheeler
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finally searched long enough to find it!

Quote:
Originally Posted by CJ7-Tim View Post
1990-2001 XJ Cherokee and 1993-1998 ZJ Grand Cherokee engine blocks interchange. Simply install the original intake/exhaust, head, fan belt driven accessories, motor mounts, transmission, OBD sensors, distributor, flywheel, or other required original parts, as needed, onto the donor engine block.

2000+ TJ and any WJ engines do not interchange and will not fit.

The junkyard talking about a 100% bolt in engine swap.

Been searching for a couple of hours for this information, and don't mean to be a thread pirate, but my question is similar to op's.

So just to be sure, a 1992 cherokee 4.0 engine block will work in my 1995 grand cherokee, I just have to swap from the head up and all of the peripherals?

The 1992 cherokee has a five speed manual, and the 95 gc has the automatic, is there any issues with the bellhouse pattern ?

Thanks guys..
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Unread 08-31-2012, 03:57 PM   #13
SchizophrenicMC
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Quote:
Originally Posted by hautewheeler View Post
Been searching for a couple of hours for this information, and don't mean to be a thread pirate, but my question is similar to op's.

So just to be sure, a 1992 cherokee 4.0 engine block will work in my 1995 grand cherokee, I just have to swap from the head up and all of the peripherals?

The 1992 cherokee has a five speed manual, and the 95 gc has the automatic, is there any issues with the bellhouse pattern ?

Thanks guys..
The manual transmission has a bellhousing, the automatic does not; it was designed to mount to the 4.0 block, whereas the manual was used for multiple engines and patterns, so it uses a bellhousing as an adapter.

As far as I know, you shouldn't have to swap the head or anything, but the peripherals may need to be swapped over. (If any peripherals have different mounting locations between models, you'll have to use model-specific components to mount them, possibly including the head and/or block)

tl;dr the engine should bolt in, but the accessories probably won't.
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Unread 09-04-2012, 04:13 AM   #14
hautewheeler
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Quote:
Originally Posted by SchizophrenicMC View Post
The manual transmission has a bellhousing, the automatic does not; it was designed to mount to the 4.0 block, whereas the manual was used for multiple engines and patterns, so it uses a bellhousing as an adapter,
That's great information, thank you.. I did not know that!
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