Topic: Engine swap question 92' to 98'

[Complete Loser]

I just ran across a 98 2.5L for sale. This would save me alot of trouble if i can just buy it and swap it with my current ragged out 92' 2.5.
My question is, is this possible? Or would i need to just swap heads and intake? I wont be getting the computer. I would rather have OBD2 but money is tight lately. And i dont have the time or the money to do that major of a swap.

 Any advice is appreciated.

[Jeffy]

You're going to have to source a lot of YJ 4.0L parts to make it work.  All of your basic stuff, harness, radiator, tach/speedo, emissions stuff, sensors, exhaust manifold, crossover pipe, etc...  Honestly, if money's tight then I wouldn't do it.

[Complete Loser]

?  im a bit confused.

What i want to do is take this 98' 2.5L and use that motor in my 92yj.  Im not going to be using the 98' computer. So  i will be keeping the 92' computer and all the sensors and install them on the 98'. Will all that be compatible with the 98' block and head?
Will the 98' block mate up to my ax5 tranny? Will the flywheel and clutch assembly be compatible aswell?

Just incase I might have said wrong, just wanted to clarify my intentions. Its been a long day (111F) in a powder coat booth.


Oh. And im assuming the 98' 2.5L is a 4cyl.

 

[Jeffy]

?  im a bit confused.

What i want to do is take this 98' 2.5L and use that motor in my 92yj.  Im not going to be using the 98' computer. So  i will be keeping the 92' computer and all the sensors and install them on the 98'. Will all that be compatible with the 98' block and head?
Will the 98' block mate up to my ax5 tranny? Will the flywheel and clutch assembly be compatible aswell?

Just incase I might have said wrong, just wanted to clarify my intentions. Its been a long day (111F) in a powder coat booth.


Oh. And im assuming the 98' 2.5L is a 4cyl.

 

Oh a 2.5L to 2.5L...  You'll probably want to use all of your accessories.  Although the waterpump spins the opposite direction then your YJ.  You'll swap out the intake and the exhaust manifolds.  Technically, you'd also want to swap cams but that isn't all that necessary.  You'll also need to swap out the engine mounts to off the engine itself as they are different as well.  Otherwise, it's pretty much bolt on and swap till it works.

[Complete Loser]

Thanks Jeffy.
(more ASSumptions) im assuming that the 98' is a roller cam, where as the 92 is flat tappet?
Also, im assuming the 98' has electronic timing control (a different distributor setup)?
 

I have no idea about these things since all my knowledge is chevy based. 

[penske2704]

the only 2 thing that is not the same is
-all the sensor
 as they dont plug whit the same connector and the water temp sensor beside the valve cover l/s on the rear of the head  is not existant on a 98 head so you need to splice and go to the water thermostat housing

-distributor shaft since it is not the same connector again

but i suggest that you replace the intake manifold and exhaust since the engine is off --they all leak--
also in your case the oil pan will fit ok

the reason i know that is because i put a 94 engine in my 98 tj  
it is realy easy to

[sharpxmen]

no roller cam (i wish there was)

[Complete Loser]

the only 2 thing that is not the same is
-all the sensor
 as they dont plug whit the same connector and the water temp sensor beside the valve cover l/s on the rear of the head  is not existant on a 98 head so you need to splice and go to the water thermostat housing

-distributor shaft since it is not the same connector again

but i suggest that you replace the intake manifold and exhaust since the engine is off --they all leak--
also in your case the oil pan will fit ok

the reason i know that is because i put a 94 engine in my 98 tj  
it is realy easy to

Thanks. :) So i will need to swap distributors?  And you say the exhaust and intake are prone to leaking?

[sharpxmen]

Thanks. :) So i will need to swap distributors?  And you say the exhaust and intake are prone to leaking?

i wonder if you can just swap the Camshaft position sensor on the distributor, that would be better if it works.

[Complete Loser]

Well that was a nice adventure. Heres the ad  http://www.hoosiertopics.com/cgi-bin/aforum.isa?req=28x7g1330a

Says "98 4cyl 2.5 runs good call 812 887 8007 charlie"

So we drove 100miles to get there and its actually an 89' 2.5.

I told him to bo-yah! off. 

[Mousejockey]

Im about to undertake nearly the same task. The 2.5 in my 97 started a knockin, I have a 91 sittin 20ft away with a donor 2.5. 
From all I can gather I should be able to do a straight swap on the long blocks correct? Reusing my sensors, manifolds..  etc etc.  I read something about the rotation of the waterpump being diff in the years?  true/false?
Smog is due sooner than I can get a rebuild of the current 2.5 so Im looking for something to run while I do that.

[sharpxmen]

Im about to undertake nearly the same task. The 2.5 in my 97 started a knockin, I have a 91 sittin 20ft away with a donor 2.5. 
From all I can gather I should be able to do a straight swap on the long blocks correct? Reusing my sensors, manifolds..  etc etc.  I read something about the rotation of the waterpump being diff in the years?  true/false?
Smog is due sooner than I can get a rebuild of the current 2.5 so Im looking for something to run while I do that.

i think you can swap your pump (again, i think but not sure) or use the YJ serpentine belt routing pattern (if possible)

[Jeffy]

i think you can swap your pump (again, i think but not sure) or use the YJ serpentine belt routing pattern (if possible)

Swap cams...  Swap the pump for a 'reverse' and reuse the YJ accessories...

[sharpxmen]

Swap cams...  Swap the pump for a 'reverse' and reuse the YJ accessories...

is the cam any different? i thought they were all 424 lift and 114/110 center lobe 91 and up

[Jeffy]

is the cam any different? i thought they were all 424 lift and 114/110 center lobe 91 and up

I was told the cam was different.  That's why one of the reasons there is a performance difference between the 1995 and the 1997 engines.