Geonovast Posted February 9, 2008 Share Posted February 9, 2008 Are they different thicknesses? I had to get a 2.8 clutch kit for my 2.5 because the 2.5 one had a throwout bearing that was completely the wrong style, and now it slips a little bit. Link to comment Share on other sites More sharing options...
Geonovast Posted February 9, 2008 Author Share Posted February 9, 2008 Someone's gotta know... Link to comment Share on other sites More sharing options...
tjbliley Posted February 10, 2008 Share Posted February 10, 2008 If they are the same they are about $150 difference in price. On another note. Why would you buy a clutch setup that has a throwout bearing that is not the same? It must be for a different tranny/motor combo. I would think it would slip since it is not made to work together. I tried to look at my microfiche but I can't find the 2.8 flywheel. If I had to guess, I would say you might need to start all over with the right parts instead of fighting it for a long time. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted February 10, 2008 Share Posted February 10, 2008 If they are the same they are about $150 difference in price. On another note. Why would you buy a clutch setup that has a throwout bearing that is not the same? It must be for a different tranny/motor combo. I would think it would slip since it is not made to work together. I tried to look at my microfiche but I can't find the 2.8 flywheel. If I had to guess, I would say you might need to start all over with the right parts instead of fighting it for a long time. 2.8 and 2.5 transmissions are the same. and he went external slave cylinder because internal slave SUCKS to fix. sooo...went with what was definitely most correct for external slave, since his parts store got him the wrong style of throwout/clutch combo (for a forward pressed slave i.e. older iron duke 2.5). correy, i did some cross-referencing and i'm pretty sure that everything's the same part number. it's the hydraulics is my bet. Link to comment Share on other sites More sharing options...
tjbliley Posted February 10, 2008 Share Posted February 10, 2008 Everywhere I looked The part number was different. It may be the same spec though. I was talking about the fact that if you are swapping part of the clutch system you should replace all of it. from the slave to the bearing including the flywheel. To try and peice together parts from different motors, to me does not make sense, since all the parts can be gotten if you are going to do the whole system. I would have to agree, now knowing more info, that you may need to look to the hydraulics. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted February 10, 2008 Share Posted February 10, 2008 hmm i'm not sure why you'd swap a perfectly good flywheel... Link to comment Share on other sites More sharing options...
tjbliley Posted February 10, 2008 Share Posted February 10, 2008 I am the kind of guy who believes in insurance. If the clutch had gone bad and you were replacing it. Then is the time to replace the flywheel, when it is accessible. If the clutch failed then I would be suspect of the flywheel. If it has one crack in it and you give it too much heat while riding it to get somewhere off road, then you are really screwed. That is why I would replace the flywheel. If I was replacing it and had issues with the throwout bearing I would make sure that all the parts were made to work together, ie - replacing everything from the clutch cylinder to the flywheel. Might cost a little more up front, but you would not have any issues with it for a Long time. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted February 10, 2008 Share Posted February 10, 2008 ah. maybe something will help clear things up... the old clutch had about 60% life left I'd say, but the new clutch needed to go in at the time for the reason you explained...easier now. flywheel had no problems :D Link to comment Share on other sites More sharing options...
1986Comanche Posted February 10, 2008 Share Posted February 10, 2008 2.8 and 2.5 transmissions are the same. and he went external slave cylinder because internal slave SUCKS to fix. sooo...went with what was definitely most correct for external slave, since his parts store got him the wrong style of throwout/clutch combo (for a forward pressed slave i.e. older iron duke 2.5). correy, i did some cross-referencing and i'm pretty sure that everything's the same part number. it's the hydraulics is my bet. How in the world would they get him a clutch kit for a GM Iron Duke 2.5L if they looked the clutch kit up for his truck? The GM Iron Duke 2.5L was never used in the Cherokee or Comanche ever and was never available. The 2.5L used in the Cherokee and Comanche is an AMC 2.5L and is a totally different motor than the GM Iron Duke 2.5L. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted February 10, 2008 Share Posted February 10, 2008 2.8 and 2.5 transmissions are the same. and he went external slave cylinder because internal slave SUCKS to fix. sooo...went with what was definitely most correct for external slave, since his parts store got him the wrong style of throwout/clutch combo (for a forward pressed slave i.e. older iron duke 2.5). correy, i did some cross-referencing and i'm pretty sure that everything's the same part number. it's the hydraulics is my bet. How in the world would they get him a clutch kit for a GM Iron Duke 2.5L if they looked the clutch kit up for his truck? The GM Iron Duke 2.5L was never used in the Cherokee or Comanche ever and was never available. The 2.5L used in the Cherokee and Comanche is an AMC 2.5L and is a totally different motor than the GM Iron Duke 2.5L. beats me dude, but fact is they got him the wrong parts. i didn't say that the iron duke was available in the xj's. trust me, i know what engine options are available. just...slow up a bit. they got him the "wrong" part (throwout bearing) when he ordered the clutch system. the part didn't match the part that's in my cherokee 2.5 5 speed 4wd, and the part in my cherokee matches the part in my 2.8 comanche. of course, the comanche is a 3.8 now and the transmission originally came from a 2.5 in the first place, but fact is that every single throwout plate (i have about 3 laying here, with the throwout bearings as well) I have laying here is identical, and came from a variation of a 2.8 v6 5 speed or a 2.5 4 cylinder 5 speed so the question here is is the flywheel different? I don't think that it measures different in thickness, which is the measurement that would effect it. the only difference i can think of is the way it's balanced (2.8 and 2.5 are NOT neutrally balanced), and the timing windows on it for the CPS pickup (2.8 doesn't have them since it's not F.I.) so, does anyone have any info different than that? or something to correct my reasoning? Link to comment Share on other sites More sharing options...
Geonovast Posted February 10, 2008 Author Share Posted February 10, 2008 If it was a problem with the flywheel needing to be replaced from being worn down, then the problem would not be that it's slipping, but that it wouldn't fully dis-engage. And yes, everything else was replaced. Brand new PP, Clutch, throwout bearing, and the master is out of my old XJ, and that was only a few months old when the truck was junked. I think it's simply that something is not allowing the slave to go back all the way. I'll try shimming it when I get the chance. The difference may be in the aluminum spacer that goes between the Slave and the flywheel? Link to comment Share on other sites More sharing options...
Geonovast Posted February 10, 2008 Author Share Posted February 10, 2008 Just to clarify, the kit that they gave me for a 1991 Jeep Comanche 2.5L 4cyl had this type of throwout bearing. Obviously that's wrong so I didn't take it. I took the old throwout bearing and the throwout plate to the parts store, ordered the kit for the 2.8, and the bearing was identical. Link to comment Share on other sites More sharing options...
1986Comanche Posted February 10, 2008 Share Posted February 10, 2008 I just went and looked in my 1986 Jeep Comanche factory parts manual and the flywheels for the 2.5L and the 2.8L look totally different from each other in the pictures. The part numbers are also different. The factory part number for the 2.5L flywheel is 89 33 002 408 and the factory part number for the 2.8L flywheel is 89 83 501 897. Hope this info helps. Link to comment Share on other sites More sharing options...
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