Re: 91 Jeep Cherokee 4.0 engine transplant.
 

Lots of folks have posted about swapping the different years with
success.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Simon Juncal wrote:
>
> DougW wrote:
> > L.W.(Bill) ------ III wrote:
> >
> >> You missed the '87 to '90 frog injection, so I think you'll be all
> >>right.
> >
> >
> > Hard to say, the cross says 84-91 on the shortblock. I'd be checking
> > every bit and the mount positions. :/
>
> More than likely the only changes are some new bosses cast into the
> block for attaching accessories.
>
> I've never heard of anyone having any major issues bolting an HO into a
> non-HO or for that matter Renix based injection (french as Bill alluded
> to) older 4.0 being replaced with the newest 4.0's...
>
> Differences include intakes with bosses for brackets what don't line up
> with older brackets (just drill new hols or use newer brackets), a
> coolant temp sensor bung that was relocated on the newer head castings
> (93 and newer I believe). The old bung is still there only capped by a
> bolt, which when removed allows the old coolant sensor to work. A newer
> (post 97) intake design (rounded runners) that flows somewhat better
> than the old square ones but still bolts up to older heads. and lots of
> minor BS mounting point relocations that don't matter a damn bit as long
> as you get the engine complete with those parts.
>
> Basically nothing that can't be overcome with a drill, a welder and a
> small amount of modification. And not even that much if you get a
> complete engine.
>
> --
> Simon
> "I may be wrong, but I'm not uncertain." -- Robert A. Heinlein

Re: 91 Jeep Cherokee 4.0 engine transplant.
 

Lots of folks have posted about swapping the different years with
success.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Simon Juncal wrote:
>
> DougW wrote:
> > L.W.(Bill) ------ III wrote:
> >
> >> You missed the '87 to '90 frog injection, so I think you'll be all
> >>right.
> >
> >
> > Hard to say, the cross says 84-91 on the shortblock. I'd be checking
> > every bit and the mount positions. :/
>
> More than likely the only changes are some new bosses cast into the
> block for attaching accessories.
>
> I've never heard of anyone having any major issues bolting an HO into a
> non-HO or for that matter Renix based injection (french as Bill alluded
> to) older 4.0 being replaced with the newest 4.0's...
>
> Differences include intakes with bosses for brackets what don't line up
> with older brackets (just drill new hols or use newer brackets), a
> coolant temp sensor bung that was relocated on the newer head castings
> (93 and newer I believe). The old bung is still there only capped by a
> bolt, which when removed allows the old coolant sensor to work. A newer
> (post 97) intake design (rounded runners) that flows somewhat better
> than the old square ones but still bolts up to older heads. and lots of
> minor BS mounting point relocations that don't matter a damn bit as long
> as you get the engine complete with those parts.
>
> Basically nothing that can't be overcome with a drill, a welder and a
> small amount of modification. And not even that much if you get a
> complete engine.
>
> --
> Simon
> "I may be wrong, but I'm not uncertain." -- Robert A. Heinlein

Re: 91 Jeep Cherokee 4.0 engine transplant.
 

Lots of folks have posted about swapping the different years with
success.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Simon Juncal wrote:
>
> DougW wrote:
> > L.W.(Bill) ------ III wrote:
> >
> >> You missed the '87 to '90 frog injection, so I think you'll be all
> >>right.
> >
> >
> > Hard to say, the cross says 84-91 on the shortblock. I'd be checking
> > every bit and the mount positions. :/
>
> More than likely the only changes are some new bosses cast into the
> block for attaching accessories.
>
> I've never heard of anyone having any major issues bolting an HO into a
> non-HO or for that matter Renix based injection (french as Bill alluded
> to) older 4.0 being replaced with the newest 4.0's...
>
> Differences include intakes with bosses for brackets what don't line up
> with older brackets (just drill new hols or use newer brackets), a
> coolant temp sensor bung that was relocated on the newer head castings
> (93 and newer I believe). The old bung is still there only capped by a
> bolt, which when removed allows the old coolant sensor to work. A newer
> (post 97) intake design (rounded runners) that flows somewhat better
> than the old square ones but still bolts up to older heads. and lots of
> minor BS mounting point relocations that don't matter a damn bit as long
> as you get the engine complete with those parts.
>
> Basically nothing that can't be overcome with a drill, a welder and a
> small amount of modification. And not even that much if you get a
> complete engine.
>
> --
> Simon
> "I may be wrong, but I'm not uncertain." -- Robert A. Heinlein

Re: 91 Jeep Cherokee 4.0 engine transplant.
 

Biggest problem with a swap between the HO and earlier 4.0's is the
head - the manifolds are NOT interchangeable between the two heads.

On Sun, 1 Oct 2006 14:33:41 UTC Simon Juncal
<SPAMERSSUCK@usefirstinitialandlastnameATerols.com > wrote:

> DougW wrote:
> > L.W.(Bill) ------ III wrote:
> >
> >> You missed the '87 to '90 frog injection, so I think you'll be all
> >>right.
> >
> >
> > Hard to say, the cross says 84-91 on the shortblock. I'd be checking
> > every bit and the mount positions. :/
>
> More than likely the only changes are some new bosses cast into the
> block for attaching accessories.
>
> I've never heard of anyone having any major issues bolting an HO into a
> non-HO or for that matter Renix based injection (french as Bill alluded
> to) older 4.0 being replaced with the newest 4.0's...
>
> Differences include intakes with bosses for brackets what don't line up
> with older brackets (just drill new hols or use newer brackets), a
> coolant temp sensor bung that was relocated on the newer head castings
> (93 and newer I believe). The old bung is still there only capped by a
> bolt, which when removed allows the old coolant sensor to work. A newer
> (post 97) intake design (rounded runners) that flows somewhat better
> than the old square ones but still bolts up to older heads. and lots of
> minor BS mounting point relocations that don't matter a damn bit as long
> as you get the engine complete with those parts.
>
> Basically nothing that can't be overcome with a drill, a welder and a
> small amount of modification. And not even that much if you get a
> complete engine.
>


--
Will Honea

Re: 91 Jeep Cherokee 4.0 engine transplant.
 

Biggest problem with a swap between the HO and earlier 4.0's is the
head - the manifolds are NOT interchangeable between the two heads.

On Sun, 1 Oct 2006 14:33:41 UTC Simon Juncal
<SPAMERSSUCK@usefirstinitialandlastnameATerols.com > wrote:

> DougW wrote:
> > L.W.(Bill) ------ III wrote:
> >
> >> You missed the '87 to '90 frog injection, so I think you'll be all
> >>right.
> >
> >
> > Hard to say, the cross says 84-91 on the shortblock. I'd be checking
> > every bit and the mount positions. :/
>
> More than likely the only changes are some new bosses cast into the
> block for attaching accessories.
>
> I've never heard of anyone having any major issues bolting an HO into a
> non-HO or for that matter Renix based injection (french as Bill alluded
> to) older 4.0 being replaced with the newest 4.0's...
>
> Differences include intakes with bosses for brackets what don't line up
> with older brackets (just drill new hols or use newer brackets), a
> coolant temp sensor bung that was relocated on the newer head castings
> (93 and newer I believe). The old bung is still there only capped by a
> bolt, which when removed allows the old coolant sensor to work. A newer
> (post 97) intake design (rounded runners) that flows somewhat better
> than the old square ones but still bolts up to older heads. and lots of
> minor BS mounting point relocations that don't matter a damn bit as long
> as you get the engine complete with those parts.
>
> Basically nothing that can't be overcome with a drill, a welder and a
> small amount of modification. And not even that much if you get a
> complete engine.
>


--
Will Honea

Re: 91 Jeep Cherokee 4.0 engine transplant.
 

Biggest problem with a swap between the HO and earlier 4.0's is the
head - the manifolds are NOT interchangeable between the two heads.

On Sun, 1 Oct 2006 14:33:41 UTC Simon Juncal
<SPAMERSSUCK@usefirstinitialandlastnameATerols.com > wrote:

> DougW wrote:
> > L.W.(Bill) ------ III wrote:
> >
> >> You missed the '87 to '90 frog injection, so I think you'll be all
> >>right.
> >
> >
> > Hard to say, the cross says 84-91 on the shortblock. I'd be checking
> > every bit and the mount positions. :/
>
> More than likely the only changes are some new bosses cast into the
> block for attaching accessories.
>
> I've never heard of anyone having any major issues bolting an HO into a
> non-HO or for that matter Renix based injection (french as Bill alluded
> to) older 4.0 being replaced with the newest 4.0's...
>
> Differences include intakes with bosses for brackets what don't line up
> with older brackets (just drill new hols or use newer brackets), a
> coolant temp sensor bung that was relocated on the newer head castings
> (93 and newer I believe). The old bung is still there only capped by a
> bolt, which when removed allows the old coolant sensor to work. A newer
> (post 97) intake design (rounded runners) that flows somewhat better
> than the old square ones but still bolts up to older heads. and lots of
> minor BS mounting point relocations that don't matter a damn bit as long
> as you get the engine complete with those parts.
>
> Basically nothing that can't be overcome with a drill, a welder and a
> small amount of modification. And not even that much if you get a
> complete engine.
>


--
Will Honea

Re: 91 Jeep Cherokee 4.0 engine transplant.
 

Will Honea wrote:
> Biggest problem with a swap between the HO and earlier 4.0's is the
> head - the manifolds are NOT interchangeable between the two heads.

I'm not sure which manifold you're talking about... the exhuast manifold
changed but the port pattern is the same so it's just a matter of
swaping manifolds, or fab'ing or buying a new collector pipe, and
modifiying brackets for clearance. The intake manifold also has the same
port pattern and is 100% interchangable from Renix to non-HO mopar MPI,
to HO, to even the newest intake (99 and up rounded runners). In fact
you can even use an old 4.2L carbureted 2bbl intake manifold on a 7120
or 0630 head. Those are both HO "high port" heads without the 0331
head's penchant for cracking.

Again this might require some minor drilling, grinding, maybe even some
welding to get workable brackets and power steering but if you're doing
an engine swap and the thought of drilling, grinding and welding scares
you then you probably ought re-think doing it. :)

--
Simon
"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein

Re: 91 Jeep Cherokee 4.0 engine transplant.
 

Will Honea wrote:
> Biggest problem with a swap between the HO and earlier 4.0's is the
> head - the manifolds are NOT interchangeable between the two heads.

I'm not sure which manifold you're talking about... the exhuast manifold
changed but the port pattern is the same so it's just a matter of
swaping manifolds, or fab'ing or buying a new collector pipe, and
modifiying brackets for clearance. The intake manifold also has the same
port pattern and is 100% interchangable from Renix to non-HO mopar MPI,
to HO, to even the newest intake (99 and up rounded runners). In fact
you can even use an old 4.2L carbureted 2bbl intake manifold on a 7120
or 0630 head. Those are both HO "high port" heads without the 0331
head's penchant for cracking.

Again this might require some minor drilling, grinding, maybe even some
welding to get workable brackets and power steering but if you're doing
an engine swap and the thought of drilling, grinding and welding scares
you then you probably ought re-think doing it. :)

--
Simon
"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein

Re: 91 Jeep Cherokee 4.0 engine transplant.
 

Will Honea wrote:
> Biggest problem with a swap between the HO and earlier 4.0's is the
> head - the manifolds are NOT interchangeable between the two heads.

I'm not sure which manifold you're talking about... the exhuast manifold
changed but the port pattern is the same so it's just a matter of
swaping manifolds, or fab'ing or buying a new collector pipe, and
modifiying brackets for clearance. The intake manifold also has the same
port pattern and is 100% interchangable from Renix to non-HO mopar MPI,
to HO, to even the newest intake (99 and up rounded runners). In fact
you can even use an old 4.2L carbureted 2bbl intake manifold on a 7120
or 0630 head. Those are both HO "high port" heads without the 0331
head's penchant for cracking.

Again this might require some minor drilling, grinding, maybe even some
welding to get workable brackets and power steering but if you're doing
an engine swap and the thought of drilling, grinding and welding scares
you then you probably ought re-think doing it. :)

--
Simon
"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein

Re: 91 Jeep Cherokee 4.0 engine transplant.
 

You may bolt an older exhaust on to the 4.0 liter, but the 258 CID
carburetor manifold will not match the ports:
http://www.----------.com/temp/258vs4LPorts.jpg
God Bless America, Bill O|||||||O
mailto:--------------------

Simon Juncal wrote:
>
> I'm not sure which manifold you're talking about... the exhuast manifold
> changed but the port pattern is the same so it's just a matter of
> swaping manifolds, or fab'ing or buying a new collector pipe, and
> modifiying brackets for clearance. The intake manifold also has the same
> port pattern and is 100% interchangable from Renix to non-HO mopar MPI,
> to HO, to even the newest intake (99 and up rounded runners). In fact
> you can even use an old 4.2L carbureted 2bbl intake manifold on a 7120
> or 0630 head. Those are both HO "high port" heads without the 0331
> head's penchant for cracking.
>
> Again this might require some minor drilling, grinding, maybe even some
> welding to get workable brackets and power steering but if you're doing
> an engine swap and the thought of drilling, grinding and welding scares
> you then you probably ought re-think doing it. :)
>
> --
> Simon
> "I may be wrong, but I'm not uncertain." -- Robert A. Heinlein