89 YJ engine swap
I have an 89 YJ with the 4.2. I am new to the Jeep World. The motor I have is making some pretty bad tapping noises. I am trying to find out if it would be better to rebuild or change to an fi 4.0.
It is usually customary to diagnose the source of the tapping before replacing the motor. It might not be that bad. I have heard all kind of bad noises come from a bad vibration dampener. A worn timing chain can be quite noisy too. Water pumps can make some bad sounding noises too. A worn valve train does not automatically mean motor replacement. Diagnose it first.
GET OFF MY LAWN!
Swap in the 4.0! I did it to my 87. if you are just swapping the motor and mating it to your existing tranny its a very simple swap. It's a bolt in replacement. There are a few modifications that need to be done to the bell housing but that's it. Then you need to make some fuel system improvements (fuel pump and regulator) because the 4.0 runs around 50 psi. Wiring is somewhat simple, depending on the donor motor you put in, I only needed to wire 5 wires to make my 4.0 fire up.
1987 yj 4.2-4.0 swap AW4 & NP 242, 31inch BFG All Terrains, 2.5 in. rough country lift, Thrush header back exhaust, K&N intake, Subaru World Rally Racing Paint
Originally Posted by kdemoney View Post
The 4.2 kicked butt after that. I have a 4.0 now and I still think the semi built 4.2 would have given me a run for my money.
The symptoms I had was low oil pressure and a nasty lifter tick after the engine warmed up. It was ok when first started.
GET OFF MY LAWN!
Originally Posted by Chrisnvegas View Post
Thanks for everyone's input. I will have to way the cost of putting in a donor 4.0 or rebuilding the 4.2.
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