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Author Topic: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????  (Read 2459 times)

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GPSAR TJ

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94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« on: October 15, 2010, 04:20:46 PM »
Threw a rod bearing/ posibly main at rausch last week, wheeled it all day sun that way, may as well get my $ worth. any how I have a complete 2.5 out of a late model yj and would like to toss that into my tj while the tj 2.5 gets a proper build for turbo( forged goodies) what is the same? whats diffrent? and what needs to stay in the tj to to this quick swap.. got most of the stuff for my turbo project and will do alot of the basic de-bugging on this older yj motor while the other gets rebuilt and this will also allow me to wheel. having withdrawl already. any advice would be great, thanks Jason
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Offline Jeffy

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #1 on: October 15, 2010, 04:45:16 PM »
The block and heads should be the same.
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Offline sharpxmen

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #2 on: October 15, 2010, 06:22:44 PM »
oil pan and oil pump (at least the pickup i think) is different. water pump is different also.
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
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Offline Bounty Hunter

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #3 on: October 15, 2010, 09:35:27 PM »
Quote from: sharpxmen on October 15, 2010, 06:22:44 PM
oil pan and oil pump (at least the pickup i think) is different. water pump is different also.
Unless the YJ donor is a '95.5, as they switched to a lot of TJ parts mid-year, like the oilpan and pickup.  Likely water pump as well, as the belt-routing changed mid-year '95.

Just use the block, head, and oilpan from the YJ.
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Offline sharpxmen

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #4 on: October 15, 2010, 10:15:33 PM »
Quote from: Bounty Hunter on October 15, 2010, 09:35:27 PM
Unless the YJ donor is a '95.5, as they switched to a lot of TJ parts mid-year, like the oilpan and pickup.  Likely water pump as well, as the belt-routing changed mid-year '95.

Just use the block, head, and oilpan from the YJ.

he's got a TJ, so why keep the YJ oilpan? isn't that going to interfere with the exhaust downpipe?
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

rroadkilll

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #5 on: October 16, 2010, 05:07:19 PM »
I believe he has to change the oil pan too...

I'm doing the same but having a shop build the short block for me...

I NEED to know this same question...   Also is there anything on the block to identify what year it's from???
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Offline sharpxmen

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #6 on: October 16, 2010, 05:23:27 PM »
Quote from: rroadkilll on October 16, 2010, 05:07:19 PM
I believe he has to change the oil pan too...

I'm doing the same but having a shop build the short block for me...

I NEED to know this same question...   Also is there anything on the block to identify what year it's from???

if you have a TJ then use the TJ oil pan and oil pump (or at least the oil pickup, i think the pumps are the same but not sure)

there's an engine identification stamped area right under the 4th cylinder spark plug (from FSM, i can confirm that's the case with my block)
first 3 digits are
1 - year
2 and 3 month
then there's a 2 digit code for the type of engine, all i know is HX stands for 150cid 9.1:1 comp ratio mpfi engine
digits 5 and 6 are for the day it was built.

so 306HX15 means it was manufactured on June 15 1993, i have no idea what they did once it reached 2000, maybe they start using letters.
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

rroadkilll

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #7 on: October 16, 2010, 05:48:59 PM »
Cool...   Thanks for the info...   I'll have to check out what they are on BOTH of my 2.5's...  The one in the garage I'm planning on building up!

Another thread for that discussion..  Let me see if I can find it!
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GPSAR TJ

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #8 on: October 17, 2010, 06:40:06 AM »
you guys are the best. thanks for the info. seeing as my tj pan looks like a gremlin went at at with a 5 lb. sledge I will use the yj pan and pickup, exhaust  routing is changing anyway for the turbo. roadkill you goin forged rods/pistons? curious to know what stuff your using. thanks all, Jason.
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rroadkilll

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #9 on: October 21, 2010, 01:29:37 PM »
I'm going to be a cheap as possible...

Dropping off the block today to get a better quote...
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rroadkilll

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #10 on: October 22, 2010, 07:48:16 AM »
The code I got for identification is 00IHX22   

I think the I may be a 1...


Also the machine shop thinks it my have to be bored to 60 over...   I don't think I'm going to do it with this block!!!
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Offline sharpxmen

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #11 on: October 22, 2010, 08:37:34 AM »
Quote from: rroadkilll on October 22, 2010, 07:48:16 AM
The code I got for identification is 00IHX22   

I think the I may be a 1...


Also the machine shop thinks it my have to be bored to 60 over...   I don't think I'm going to do it with this block!!!

HX is def past 91 so that would make it Jan 22 2000 - unless that first 0 it's an 8 then is a '98 rather
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline dwtaylorpdx

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #12 on: October 23, 2010, 01:03:38 AM »
Quote from: rroadkilll on October 22, 2010, 07:48:16 AM
The code I got for identification is 00IHX22   

I think the I may be a 1...


Also the machine shop thinks it my have to be bored to 60 over...   I don't think I'm going to do it with this block!!!

Youd have to sonic check it to make sure all the cylinder walls can handle it.
Mine would have maxed out at 50 on two cylinders. But I only needed 30...

Dave
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94 YJ - 2.5 Hesco Cam B&B Ported - AX5 Trans w/Centerforce Dual Friction Clutch - 4" Rough Country Lift W/Skyjacker Shocks - D44 Rear/ARB - D30/ARB - ARB Compressor - Warn M8000 in Custom Bumper - Reunell Rear Bumper - Metalcloak 6" Body Armor Kit - Tuffy Console - 265x85-16 Tires - 2M Radio

GPSAR TJ

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Re: 94-95 yj mpi 2.5 same as 97-98 tj 2.5 block n heads ??????
« Reply #13 on: October 27, 2010, 05:18:19 PM »
Update to OP. pulled the oil pan, found piston soup. piston closest to the trans, all the skirt up to the wristpin and about halfway around one side of the wristpin in the bottom of the pan. really sounded like a rod bearing but damn this thing is tough, i beat it mercillessly all day in that condition at rausch.
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