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Unread 04-11-2010, 12:00 PM   #1
89blackwidow
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I bought a 4.0l engine for $10!

I was fortunate enough to purchase this motor on ebay for $10.50. It was pulled from a 94 with 130,000 miles. It doesn't have a flywheel but crank easily turns over. It does have an area of rust on the block I'm a little concerned about, but overall its appears to be pretty decent. If anyone can tell me things that are obviously missing from the motor please let me know as this is the first 6 cylinder I have see up close. I hope to be able to rebuild it and put it in my 89 to replace the 2.5l.









This next photo is the area of rust I am concerned about. Not sure if this can be repaired at a machine shop or not.



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Unread 04-11-2010, 01:11 PM   #2
88YJtoCJ
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looks like a blown head? Can't really tell from that picture which part of the block it is.

You could get a new head if thats the case, which would take care of that during a rebuild.
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Unread 04-11-2010, 01:22 PM   #3
moonshinefuel
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Wow, you got ripped, $7.49 would have been my final offer. Considered an HO engine right? I think all od them were at that time, not sure though.
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Unread 04-11-2010, 01:26 PM   #4
green89yj
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yeah. That is an HO. It's OBDI too which will help when wiring it up. Obviously gonna need a new distributor, ha. I'd go to the junkyard and get everything from a 94 YJ or XJ as far as wiring goes and just start cleaning the block up and looking for issues.
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Unread 04-11-2010, 01:35 PM   #5
89blackwidow
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If I am reading the block casting correctly its from a 95. The number is 509MXI3. The other block number is 53020569 which I think is a serial number.
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Unread 04-11-2010, 01:39 PM   #6
iluvtruenos
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It is a 95+.

The oil cap is a clicky type that screws on. The Earlier ones had two tabs.
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Unread 04-11-2010, 03:51 PM   #7
89blackwidow
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Thanks for the responses!
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Unread 04-11-2010, 05:39 PM   #8
geusey
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Quote:
Originally Posted by moonshinefuel View Post
Wow, you got ripped, $7.49 would have been my final offer. Considered an HO engine right? I think all od them were at that time, not sure though.
yeah, im pretty sure all of the fuel injected 4.0s they put in yjs were HO.
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It seemed like a good idea at the time...
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Unread 04-11-2010, 07:26 PM   #9
SkullTripper
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Where can I find out what the numbers on the side of my engine mean? sorry for highjacking :/
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Unread 04-12-2010, 11:59 AM   #10
Alfons
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That engine looks pretty good & that bit of rust on cast iron is nothing, but before installing it, I'd do a compression test on it to see if it's worth putting in - the rebuild parts and labor for things like honing etc will add up to a lot of cash. To do the compression test, you'll need a bell housing, starter motor, and battery.

Do you have the harness, computer, etc as well?
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Unread 04-12-2010, 12:20 PM   #11
MLJeeper
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Shame you live in N. Cali. I have a 20 gallon plastic tank with fuel pump etc you will need. Bound to save you some cash, Think i have $25 bucks in it. But shipping a fuel tank has to be a nightmare.
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Unread 04-12-2010, 12:58 PM   #12
Reverb
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Wire brush that rust off and see if thats a crack on the left. I think thats a mounting point though so you should be in the clear.
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Unread 04-12-2010, 01:25 PM   #13
RikRotorhead
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Alternator, idler pulley, and power steering pump are missing.
That rust could be coming from a leaking freeze plug. Hard to tell from that pic even which side of the engine it's on.
Great score. And yeah, you will need a flywheel from a 4.0 with the CPS notches, an AX15 trans, NP231/J transfer case, and a fuel tank from a YJ that had fuel injection. Your 2.5 has the AX5 and a np231 with 21 spline, you need a 23 to work with the ax15.
All bone yard parts or craigslist. But for what you paid for that engine, it will be a relatively inexpensive install.
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Unread 04-12-2010, 02:36 PM   #14
timatoe
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Where you at in NorCal? There's lots of us in the Sac area that would probably be willing to help out.
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Unread 04-12-2010, 05:46 PM   #15
89blackwidow
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Quote:
Originally Posted by Alfons View Post
That engine looks pretty good & that bit of rust on cast iron is nothing, but before installing it, I'd do a compression test on it to see if it's worth putting in - the rebuild parts and labor for things like honing etc will add up to a lot of cash. To do the compression test, you'll need a bell housing, starter motor, and battery.

Do you have the harness, computer, etc as well?
No harness or computer. I think I will probably take my time on this and break it down to replace the bearings, rings etc. I also take the block to get new freeze plugs put in.
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