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Old 03-26-2013, 02:39 PM   #1
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Replacing 2.5 Jeep Motor

I bought my first Jeep a few weeks ago, a 91 YJ. It has 91k on it, I was told by the guy I purchased it from that it had been years since he changed the oil...cause it had just been kept in his garage, not driven much at all. I decided to drive it a little to warm the motor up before changing the oil, but got overwhelmed with what it felt like to cruise without a top or doors. Later that evening, as I went to shift gears, it threw a rod. I've located a long block, at a very decent price. I am going to put it in myself, as I have done several motor replacements years ago....just not in a Jeep, nor in a standard. It looks fairly easy. Just wondering if anyone has any suggestions or things I should look out for pulling or installing the motors? This will be the first standard I've done, I'm used to torque converters.

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Old 03-26-2013, 02:58 PM   #2
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Welcome to the wonderful world of Jeeps!

If it were me I would check on all of the normal wear items, clutch, brakes, etc, and replace as required. Then I would replace all of the fluids, engine (doh), trans, transfer case, both axles, lube it up and then check on the state of the plugs, rotor, cap, and wires.

Once you are done with the swap and everything else go out and have fun with your new toy!

PS add your city and state in your profile.

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Old 03-26-2013, 03:18 PM   #3
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Yeah I think I am going to replace everything i can, so she is like new! Oh and I have my state listed, don't see a place for the city?
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Old 03-26-2013, 03:26 PM   #4
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Follow this:
user CP- top left of this post
your profile
edit your details
in additional info box
where you live- put in city, state
you done!

Yea if you take your time and go through your Jeep from stem to stern she will be sweet!
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Old 03-26-2013, 03:30 PM   #5
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Not trying to be nosy, but what kind of long block deal were you able to find? I ask because I may be in need of one in the future and the 2.5's seem high.....I guess I am being nosy!....lol
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Old 03-27-2013, 02:15 PM   #6
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It's $1041 for a totally rebuilt long block, comes with 7 year 70k warranty. The number to the place is 866 265 5584. The also said the 2.5 have a bad problems throwing rods because of the factor pistons...? I thought about buying a used motor, most average 5 to 9 hundred I've found...but then I figured I would probably be getting someone else's problem...this way I know what I have.
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Old 03-27-2013, 06:53 PM   #7
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I'm rebuilding my 2.5 ,figured it was pretty easy to pull tranny and transfer case as well as the rear driveshaft out as one unit.took the front grill off as well as the driver side fender.made it a lot easier to get it off.good luck w/your project...russ
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Old 03-27-2013, 08:48 PM   #8
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1000 bucks doesnt seem too bad. I will give them a call. Thanks!
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Old 03-27-2013, 09:40 PM   #9
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Be wary when dropping the Tranny/Engine. There is NOT enough clearance for the valve cover and it WILL hit the firewall and break. (ask me how I know this)...... Cost better than $150 to replace 15 years ago.......
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Old 03-28-2013, 09:25 PM   #10
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The '91 should still have the 'internal' slave cyl. You def. want to repl this. Otherwise the tranny has to come back out in the future. I would repl the clutch disc, pressure plate, and throw out brg at this time. Hoses, tstat...
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Old 03-29-2013, 01:28 PM   #11
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Be sure and do what YJ325i says about the slave cylinder. Some "DUMBA$$ ENGINEER" decided it was a good idea to put the slave cylinder inside the bell housing. I guess they thought that part would never need to be replaced. Well guess what, it will need to be replaced at sometime in the future. I know because I own a '90 model and I'm about to drop the tranny and replace the slave cylinder and clutch and other associated parts while im in there.
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Old 03-29-2013, 03:56 PM   #12
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Ok I will def do that. I was going to see what the clutch looked like when I got in there, but either way I'm going to replace it. Hate to have to pull it apart again.
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Old 03-29-2013, 04:46 PM   #13
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I just finished installing a new engine in my 91 yj. I have a few turned down long bolts that I can send you that will help getting the engine back in and aligned with the bell housing. I pulled and re-installed my engine by myself and they help a lot. PM me an address and I'll get them in the mail. I'm up for a phone call too if you don't want to type forever on the computer. I can go over things I found out as I was going through mine.

let me know,

Craig
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Old 03-31-2013, 05:42 PM   #14
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Thanks Craig, I sent you a IM.

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