Engine swap?

[hotrod]

Just wondering if a 4.0 out of a 87 XJ with an auto will drop right into a 89 YJ with an auto? How difficult would this be? Thanks

 

[toyworx]

You've got the wiring for the EFI to conetend with unless you are just going to use the 4.0 long block and put all of the 4.2 parts from the YJ onto it.

 

[PaulW]

i don't know if the trannies will bolt up. the yj uses a chrysler auto and the xj uses a toyota trans, would reccommend doing some research on the bellhousing patterns

 

[toyworx]

4.0 and a 4.2 have the same pattern on the block, so the bellhousing side won't be an issue

 

[beaker]

4.0 and a 4.2 have the same pattern on the block, so the bellhousing side won't be an issue

It may, you need a place to put the flywheel position sensor which is normally mounted on the bellhousing.

There are reloacator kits to put them on the front.

The accessories on the front of the engine may need to be moved. XJ's and YJ's had different brackets. They may fit they may not, don't know.

Jeepinmax did a engine swap on his YJ, he may have more insight into this.

 

[yj-mike]

Go to the 4.0 swap forum at cjoffroad.com

The fine folks there will be able to answer all of your questions.

Mike

 

[hotrod]

Thanks guys. What does everyone recommend I do? Should I look for a running 4.2? I have the 4.0 and its free but it sounds like a head ache. Thanks for your suggestions.
-Dan

 

[kakirubi]

Go with the 4.0. It's a little work but you wont regret it! Helped Jeepinmax with his install. He is the one to talk to! :mrgreen:

 

[beaker]

The 4.0 has everything you need,

Horsepower and EFI, what ever the angle it will run and pull you through.

An alternative is to mount the head and manifolds from a 4.0 onto a 4.2 and run it. I think some coolant ports need to be blocked but other than that it's a bolt together.

If your going to use the auto from the 4.2 wrangler you'll need a crankshaft position sensor relocator. It puts it on the front of the crank. A little googleing should find one.

As for fitting the accessories. Measure the width on your engine bay where your accessories mount to the front of the engine and measure the width on the cherokee. I suspect yours will be wider. They probably mounted the yj's differently since they had more room.

 

[toyworx]

HESCO should have the stuff you need.

 

[JeepinMaxx]

HESCO should have the stuff you need.

I swapped a '92 YJ engine into a '90YJ. The Hesco harness set-up was a HUGE time/money saver :lol:

The crank position sensor relocation was expensive (and since the AX15 bell housing accommodated the original CPS - it turns out it wasn't needed) - still have the set-up on hand if anyone needs it...

However - an '87 XJ engine has the earlier Renix fuel injection/computer- so it is not compatable with 90+ XJ/YJ ECMs Check out the post below..

The 4.0 has everything you need,

Horsepower and EFI, what ever the angle it will run and pull you through.

An alternative is to mount the head and manifolds from a 4.0 onto a 4.2 and run it. I think some coolant ports need to be blocked but other than that it's a bolt together.

If your going to use the auto from the 4.2 wrangler you'll need a crankshaft position sensor relocator. It puts it on the front of the crank. A little googleing should find one.

As for fitting the accessories. Measure the width on your engine bay where your accessories mount to the front of the engine and measure the width on the cherokee. I suspect yours will be wider. They probably mounted the yj's differently since they had more room.

 

[hotrod]

Will it be compatible with an 89 ECM? How much do you want for the cps relocator? Thanks for all the replies. I am going to try and pull the wrangler motor out Friday and see what I am getting into :smile: its not like I have enough projects already