3.4 swap into 1985 Jeep Cherokee questions?

[1986cherokee]

sounds like a good plan, too bad about putting in a used clutch though... well you should let me know if that s-10 flywheel works because i might just buy one. could i use the camaro wiring harness?? it would save $$$, lots. I hope the engine is from a manual tranny. well i start removing my engine tomarrow wish me luck...

Its a 94 camaro too, i read that i wouldnt have a lot of problems if it were a 93'

[cardana24]

sounds like a good plan, too bad about putting in a used clutch though... well you should let me know if that s-10 flywheel works because i might just buy one. could i use the camaro wiring harness?? it would save $$$, lots. I hope the engine is from a manual tranny. well i start removing my engine tomarrow wish me luck...

Its a 94 camaro too, i read that i wouldnt have a lot of problems if it were a 93'

I'll probably be selling mine if you are interested...just PM me.

[geoffinbc]

sounds like a good plan, too bad about putting in a used clutch though... well you should let me know if that s-10 flywheel works because i might just buy one. could i use the camaro wiring harness?? it would save $$$, lots. I hope the engine is from a manual tranny. well i start removing my engine tomarrow wish me luck...

Its a 94 camaro too, i read that i wouldnt have a lot of problems if it were a 93'

93 to 95 3.4L's were identical so I don't know why a 93 would give you any trouble.

[1986cherokee]

how hard is it to use the camaro's harness?

[cardana24]

alright guys, I pulled the transmission again, help me get it right this time. I notice a few things that seem not quite right but I would like you guys to check the pics out and tell me what you think.

First of all the pilot bearing is worn down on one side...I am guessing possibly i did not have the input shaft lined up when tightening the bell housing bolts. Any other ideas? Will this cause a problem? What tool do you use to take out a pilot bearing? I have never taken one out before. When I have done clutches in the past I don't change them because they have looked fine.

Here is a pic of the throw out bearing on the shift fork. I don't know how I can mess this one up but please varify this is right.

Next I put the flywheels side by side and they look the same. So I do not think that is a problem.

Then I looked at the clutch discs, I laid them on a flat surface and took a few pics, the appear to be the same size so I don't think that's a problem.


Now for the other thing I think could be a problem. I looked at the pressure plates, and the old one the ridges sit up just a little higher than the new one...I am guessing this could cause a problem because when the TOB pushes in on the ridges it will not be able to push the new one down as hard.
old

new

Please give me some input I am trying to put this thing back together before this weekend. I am going to the parts store now to try to get a new pilot bearing, and some sort of puller to get the old one out. Also I am going to have them cross reference the original part number on the pressure plate.

[cardana24]

okay, so I got a pilot bearing puller from Advanced and pulled my bearing out (had to shove a screwdiver between the jaws to give it enough leverage but that's another story). here are a few pics I took. As you can see the bearing is cracked and eaten up on one side. I tried to put the opposite side (no eaten up side) onto the input shaft and it would not slide on. I'm guessing this is a problem? I assume the bearing should be able to slide on to the end of the input shaft?



I don't feel like going back a ton of pages but if you guys remember the first clutch kit I got for this project was for the wrong year cherokee (the company sent me the wrong one) well I installed the pilot bearing from that kit since it fit with the out side diameter...so I never pulled it out. Could this be what is causing my no shifting situation? If you think it is can you please explain why. I have another pilot bearing coming in tomorrow made for this engine, but I would like a little piece of mind before I put it back together again. Thanks for any help.

I'm guessing the engine would not be to happy running this way either since it has something in the end of the crank that does not fit?

[geoffinbc]

Yes the pilot bearing MUST fit the end of the input shaft. The input shaft only has one bearing supporting it inside the transmission and then the output shaft rides on a needle bearing in the input shaft inside the transmission. The job of the pilot bearing is to support the input shaft at the other end. When the input clutch is engaged the input shaft and crank move at the same speed so the pilot bearing has no load on it. However when you push the clutch in the pilot bearing now supports a spinning input shaft or rather a stationary input shaft and a rotating crank. This is why it is never a good idea to have your transmission in gear and holding the clutch peddle in while sitting at a long light. You just wear out the pilot bushing and throw out bearing.

So if you have a pilot bearing that is sloppy you may feel vibration a stiff clutch peddle and bad shifting. If the pilot bearing it too small then the transmission wont install into the crank and it would be very difficult to bolt up. If you do somehow force the transmission input shaft in the bushing it would be a very tight fit and the input shaft would always try and spin with the crank and you would again have difficulty shifting.

[cardana24]

Yes the pilot bearing MUST fit the end of the input shaft. The input shaft only has one bearing supporting it inside the transmission and then the output shaft rides on a needle bearing in the input shaft inside the transmission. The job of the pilot bearing is to support the input shaft at the other end. When the input clutch is engaged the input shaft and crank move at the same speed so the pilot bearing has no load on it. However when you push the clutch in the pilot bearing now supports a spinning input shaft or rather a stationary input shaft and a rotating crank. This is why it is never a good idea to have your transmission in gear and holding the clutch peddle in while sitting at a long light. You just wear out the pilot bushing and throw out bearing.

So if you have a pilot bearing that is sloppy you may feel vibration a stiff clutch peddle and bad shifting. If the pilot bearing it too small then the transmission wont install into the crank and it would be very difficult to bolt up. If you do somehow force the transmission input shaft in the bushing it would be a very tight fit and the input shaft would always try and spin with the crank and you would again have difficulty shifting.

it was very hard to bolt up. I kept on tightening from side to side then finally it made a poping noise and it was a lot easier...I assume it was when the input shaft broke the pilot bearing. Anyway, so you are thinking this could be my problem? Check out my post before this one and let me know what you think about all of those pictures. What is your advice with those? Thanks for you help.

[geoffinbc]

Yea I think you found the problem. There is sever scoring inside that bushing. Which suggests a tight fit. You basically had an input shaft pressed into the crank shaft causing them to always try and spin together. With a new bushing you should be alright. Inspect the end of the transmission input and be sure there is no damage. You can clean up minor blemishes with some 400 grit emery cloth.

For future reference you should NEVER use the bell housing bolts to force the transmission in. If you cannot get it seated all the way to the block and sitting on the dowel pins then something is wrong. Double check that you did not crack the case. I also hope there was no damage to the thrust bearing in the block.

[cardana24]

Yea I think you found the problem. There is sever scoring inside that bushing. Which suggests a tight fit. You basically had an input shaft pressed into the crank shaft causing them to always try and spin together. With a new bushing you should be alright. Inspect the end of the transmission input and be sure there is no damage. You can clean up minor blemishes with some 400 grit emery cloth.

For future reference you should NEVER use the bell housing bolts to force the transmission in. If you cannot get it seated all the way to the block and sitting on the dowel pins then something is wrong. Double check that you did not crack the case. I also hope there was no damage to the thrust bearing in the block.

Yeah I hope I did not do any damage. I will find out soon enough.

So do you think I am safe to use the new clutch disc and pressure plate now? I would rather not put back in old parts, but if those are the ones that will work then I will.

[CNCguy]

It looks almost like the input shaft broached its way through the bushing. Perhaps the clutch disk wasn't centered with the bushing. Did you use an alignment shaft when you installed the clutch disk and pressure plate?

[cardana24]

It looks almost like the input shaft broached its way through the bushing. Perhaps the clutch disk wasn't centered with the bushing. Did you use an alignment shaft when you installed the clutch disk and pressure plate?

yes I used the alignment tool....anything is possible. It could have slipped out of place at the last minute...I don't know.

[cardana24]

I pressed the new pilot bearing in last night and put the clutch back on. So my set up as of this point is. Original 2.8 flywheel neutrally balanced and re surfaced, new clutch disc, old pressure plate, new throw out bearing. Sound good to everyone? Speak now or for ever hold your peace. I am putting it back together tonight so any last minute advice?

[geoffinbc]

Sounds good. Did you check that the pilot bearing slipped over the end of the input shaft of the trans.

[cardana24]

Sounds good. Did you check that the pilot bearing slipped over the end of the input shaft of the trans.

yes, and it does. I tried the old one just for the heck of it, and it will not slip over...I guess I should have checked that in the first place.