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Engine interchange?


 
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Jeep Autobot
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Joined: 16 May 2006
Location: Red in Libbyland

PostPosted: Wed Feb 07, 2007 5:18 pm    Post subject: Engine interchange? Reply with quote

So, I hope no one has to smack me for missing a sticky or for just plain stupidity...but I'm trying to find out whether I can replace my 4.0 from my 92 Wrangler with say, the 4.0 out of a 96 Cherokee. Will the 4.0's interchange from other models into the Wrangler w/out much hassle? Will motor brackets or at least the mounts be the same? What about the computers, will mine be easily compatible with a 4.0 from another model Jeep? Any help or resources would be much appreciated.

Thanks.
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Fri Mar 02, 2007 7:10 pm    Post subject: Reply with quote

In 1991 Chrysler Corporation, then the owners of the Jeep brand, redesigned the RENIX engine control computer and raised the intake ports approximately 1/8″ for a better entry radius. Chrysler also enlarged the throttle body and redesigned the intake and exhaust manifolds for more efficiency, and the fuel injectors were once again replaced with higher flowing units. The camshaft profile was also changed. The net result of all these changes was an engine that made 190 hp (142 kW) and 225 lb-ft (305 Nm) of torque. Badging on Jeeps equipped with this engine read "4.0 Litre HIGH OUTPUT". The new cam profile combined with altered computer programming eliminated the need for an EGR valve and knock sensor, but make the engine more sensitive to alterations, especially where emissions are concerned.

Small changes were made to the cylinder head for the 1995 model year. In 1996, the engine block was redesigned, and a new strengthened unit was then used. The new block made use of more webbing cast into the block, and a stud girdle for added rigidity of the crankshaft main bearings. The cylinder head was also again changed around 1998 to a lower flowing, but more emissions friendly, design.

it should mount up but im pretty sure you would have to swap over the wiring harness .

i am personally in the middle of a swap from a 92 into a 89 and i had to swap the engine , both the interior and engine harness . its not so great to do .

perhaps it will work but if they changed any of the sensor's you will have problems , if you don't want to swap a harness then i would look for a 94 you might be able to get away with a 95 its hard to say .

do you want to put in the new one because it is a better engine or because your's is not working ?
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Fri Mar 09, 2007 9:30 pm    Post subject: Reply with quote

another option would be to just swap over the short block .then you wouldn't have to swap any harnesses .
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