Topic: Swapping 93' 2.5 into my 97' SE?

[catfish33]

Can I swap a used 93' 2.5 in to my 97' SE? Guy has one locally to me that only has 5,000 miles on it and is asking $550.

[sharpxmen]

Can I swap a used 93' 2.5 in to my 97' SE? Guy has one locally to me that only has 5,000 miles on it and is asking $550.

yes. you'd probably need your cam sensor as the connectors are probably different (or whole distributor), temp sensor in the thermostat housing and maybe the oil pressure sender. use your intake and exhaust manifolds. Someone said at some point that the waterpump on TJ spins opposite to the YJ one, i can't tell you if that's the case or not but better doublecheck.

[neale_rs]

Make sure you don't have problems with state inspections and such things.

[Jeffy]

The cams are different but I think that's a minor issue.  Routing of the belt is completely different but you can reuse all of your accessories and convert it over.  You'll want to swap everything from your TJ over to the stripped YJ block so you won't run into any compatibility issues.

[catfish33]

Thanks for the replies guys. I picked that motor up last saturday. It had been totally rebuilt 5,000 miles ago. It is all stripped and ready to go in. GOing to hopefully get mine out tonight and start putting it back in tomorrow night.

[catfish33]

Well the rebuilt motor is sitting between the frame rails as of 10:30 last night. Gotta rework my exhaust to work with the older model oil pan. Gotta put the PS pump, alternator, AC and Starter back on, then it is a matter of plugging things back in.

[sharpxmen]

Well the rebuilt motor is sitting between the frame rails as of 10:30 last night. Gotta rework my exhaust to work with the older model oil pan. Gotta put the PS pump, alternator, AC and Starter back on, then it is a matter of plugging things back in.

you could swap your own oil pan but i think the oil pump pickup might be also different so you might need to swap that as well. I meant to mention the oil pan but i recall someone saying it worked without it but i can't remember if it was YJ to TJ swap or the other way around (which would make more sense so that was probably it).

[catfish33]

Yeah I could have swapped the pan and the pickup tube. But I didn't want to mess with changing them out. I work in a shop that makes exhaust fixtures and gages so I just brought my pipe in an welded a bridge from the close to the bell to the straight part of the pipe. Then cut teh section out moved it forward 6 inches and rewelded it.

[neale_rs]

How are the pans different?  Isn't it just the position of the drain plug?

[catfish33]

The sump is actually thicker (front to back) than the 97' and later. so whwn the exhaust crossed under the pan it now hit it. So I had to move the crossover section forward.

[catfish33]

SHE'S ALIVE. Had to grind the located ears off the dizzy so I could adjust for the difference in the cam duration. But man does she purr. I need to get  atiming light on it and see if I can tweak it in some more. Man I missed driving the old girl. Hell she is just like a new Jeep. 

[sharpxmen]

Had to grind the located ears off the dizzy so I could adjust for the difference in the cam duration. But man does she purr. I need to get  atiming light on it and see if I can tweak it in some more.

explain this some more, what's "the dizzy"? and how do you plan to adjust timing?
if you're thinking you adjust timing by rotating the distributor don't bother, it won't work but it will get your spark weaker (rotor out of sync with the cap prongs) and possibly firing the injectors in the wrong spot, rotating the distributor will not adjust your ignition timing.

[catfish33]

DIzzy = distributor. And why wouldn't turning the dizzy adjust the timing? Or am I just wording that wrong? All I know is she wouldn't run with the distributor in the stock location. Took out the clamp bolt, rotated it counterclockwise while my buddy was cranking it over and VROOM, she fired up. Adjusted the dizzy just a bit more to smooth her out and clamped it down.

[sharpxmen]

DIzzy = distributor. And why wouldn't turning the dizzy adjust the timing? Or am I just wording that wrong? All I know is she wouldn't run with the distributor in the stock location. Took out the clamp bolt, rotated it counterclockwise while my buddy was cranking it over and VROOM, she fired up. Adjusted the dizzy just a bit more to smooth her out and clamped it down.

the distributor aligns the rotor with the cap so the spark goes to the correct cylinder, the crankshaft position sensor provides the timing signal for the spark. the cam sensor in the distributor is for injector opening sequence. if you swapped the distributor you were off by a tooth or so and you got it corrected when rotating it, i suggest taking it out and setting it correctly. you can try with the timing light, it's either won't start or you get the same ignition advance regardless of the positon, at some point i would misfire or stop running depending how far off you are.

[catfish33]

I used the distributor from the 97. If you look at the dizzy from the 97 and from the 93 side by side the rotation of the oil pump stub is different from each other in conjunction with the rotor. How do you set it correctly? Sorry I am used to working on older carburated V-8s.