Micahmanche6946 Posted April 13, 2020 Posted April 13, 2020 Hello, I'm new on here. I’ve had my 1990 pioneer 4.0 for about 6 years now. It currently has 243,000 miles on it. Engine blows and leaks oil everywhere so I took the entourage of a 1991 yj that runs great. If anyone could help me it would be greatly appreciated. I know it’s possible because almost every thing is. What I would like to know is if it’s easy and worth it. I have basic knowledge but never have swapped an engine or even replaced one. thanks in advance
MiNi Beast Posted April 13, 2020 Posted April 13, 2020 Replace long block and bolt on your accessories and brackets. Send it.
Micahmanche6946 Posted April 13, 2020 Author Posted April 13, 2020 This is sad. I’m not even sure which one is the long bock. Thanks for responding. I’ll do some research.
jdog Posted April 13, 2020 Posted April 13, 2020 Long block is the block and the head So the complete engine. I would switch the intakes and exhaust to make it easier.
MiNi Beast Posted April 13, 2020 Posted April 13, 2020 Yes 4.0 is same. Motor mounts will be different. Fly wheel be same if same trans otherwise swap that as well. Intake and exhaust varies if you had a h.o. version. Which you shouldn't. Your alt bracket and and ac brackets varies so best to keep yours. Best is replace block with head still attached. With it torn apart though be best time to reseal everything and replace rear main seal as well. Water pump may be different as well so double check that. If not in a rush take time do it right and clean things up and replace maintenance things as needed and to ensure good life.
Micahmanche6946 Posted April 13, 2020 Author Posted April 13, 2020 Awesome! That does help. I’ll take some pics and updates soon. I appreciate everyone’s help.
MiNi Beast Posted April 13, 2020 Posted April 13, 2020 Happy to help. Great site with good folks willing to share experience and info. Just remember its all nuts and bolts.
Eagle Posted April 14, 2020 Posted April 14, 2020 On 4/13/2020 at 12:02 AM, MiNi Beast said: Yes 4.0 is same. Motor mounts will be different. Fly wheel be same if same trans otherwise swap that as well. Flywheel won't be the same. 1990 is still Renix -- 1991 is Chrysler. He'll have to use the old flywheel or flex plate.
Micahmanche6946 Posted April 14, 2020 Author Posted April 14, 2020 Thanks! I started disassembling the Comanche last night. Hoping to pull the motor this weekend
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now