teamsmith Posted March 10, 2015 Share Posted March 10, 2015 I'm putting in an engine from a '98 and need to buy a new clutch pilot bearing. The part listed for the '98 is different than for my '89. Do I go with the clutch year ('89) or engine year ('98)? If I'm reading the spec correctly, it looks like the O.D. is the same for both years but the I.D. is different, so that tells me I should go with the clutch year. Can someone confirm? Thanks Link to comment Share on other sites More sharing options...
Eagle Posted March 10, 2015 Share Posted March 10, 2015 The pilot bearing is usually replaced when doing a clutch, but it is NOT a "clutch" pilot bearing. It doesn't in any way contact the clutch. The pilot bearing is what keeps the nose of the transmission input shaft centered in the crankshaft. So what you need to match is the O.D. to the crankshaft, and the I.D. to your transmission input shaft. (The reduced diameter at the tip, not the diameter at the splined portion.) Link to comment Share on other sites More sharing options...
teamsmith Posted March 10, 2015 Author Share Posted March 10, 2015 ok, Rock Auto calls it a clutch pilot bearing. Maybe they are using 'clutch' as an adjective, as in: This bearing is clutch in making sure that your input shaft is centered in your crankshaft. My head just spun around trying to visualize ID of input vs. OD Output then I got sidetracked thinking about Garfield's tormented dog, Odie. It looks like the crankshaft on the '98 and the '89 are the same so I'll use the '89 spec to match the transmission input shaft of the BA10/5. Thanks. Link to comment Share on other sites More sharing options...
1987Comanche Posted March 11, 2015 Share Posted March 11, 2015 The Renix crank has a smaller pilot dia than the HO crank. Your bearing ID will be correct but the OD won't. Link to comment Share on other sites More sharing options...
teamsmith Posted March 11, 2015 Author Share Posted March 11, 2015 The Renix crank has a smaller pilot dia than the HO crank. Your bearing ID will be correct but the OD won't.Ok thanks. I think I have it figured out. I'll get the bearing that is spec d to go with the ho.Thanks again Link to comment Share on other sites More sharing options...
Rockfrog Posted March 11, 2015 Share Posted March 11, 2015 That won't work either, the 98 had a bigger outside diameter, and the B/A 10 has a smaller inside diameter bearing. Trans Pilot - 87-93 (BA10 and AX15) - 0.590" 94 and up (AX15, NV3550) - 0.750" Crank Pilot - 87-93 - 1.1" OD 94 and up - 1" OD Link to comment Share on other sites More sharing options...
teamsmith Posted March 11, 2015 Author Share Posted March 11, 2015 Ok. So if bearing from either the '89 or '98 won't work, is there a bearing that will work? My search continues... Thank you all for your help. This site continues to be a valuable resource. Link to comment Share on other sites More sharing options...
teamsmith Posted March 11, 2015 Author Share Posted March 11, 2015 So, according to this post on Jeepsunlimited, my only option is getting a 87-93 and having it turned down by a machine shop. Stock 89 pilot bearing (National FC66426) 1.055 O.D. - .579 I.D. turned down to 1.0" O.D. http://www.jeepsunlimited.com/forums/showthread.php?321964-Pilot-bearing-for-4-0-stroker-engine-swaps-in-5-speed-4-0-XJ/page2 Edit: It looks like if I switch to a bushing, which goes to the larger first step of the crankshaft, I can use an advance adapters (P/N 716156GM) Pilot Bushing .590 ID X 1.818 OD per the below thread. http://www.cherokeeforum.com/f2/pilot-bearing-non-h-o-h-o-swap-20845/index2/ http://www.advanceadapters.com/products/716156gm--pilot-bushing-590-id-x-1818-od/ Hopefully this post will help others who try to tackle this in the future. Link to comment Share on other sites More sharing options...
xjrev10 Posted March 11, 2015 Share Posted March 11, 2015 Order a bearing for a 1974 CJ with a 304. Works like a charm. Link to comment Share on other sites More sharing options...
teamsmith Posted March 11, 2015 Author Share Posted March 11, 2015 Order a bearing for a 1974 CJ with a 304. Works like a charm. I may be mistaken, but I think the CJ bushing will only work if I'm going in reverse, mounting a 94+ AX-15 to an older engine. It has an ID of .75" while I need an ID of .59 to mate to the transmission. Link to comment Share on other sites More sharing options...
Rockfrog Posted March 11, 2015 Share Posted March 11, 2015 Correct the CJ bushing is for adding a late model trans to and early engine. You are doing the opposite. The easy answer is to find a 94+ trans. Link to comment Share on other sites More sharing options...
teamsmith Posted March 11, 2015 Author Share Posted March 11, 2015 yes, it would be optimal to have picked up a 94+ transmission and transfer case. That will likely happen in the future but while the tranny is working fine, I will put that expense off as long as possible. I bought the advanced adapters bushing which I confirmed will work. Link to comment Share on other sites More sharing options...
Rockfrog Posted March 11, 2015 Share Posted March 11, 2015 I hear ya, my BA still works fine too. But I do have a 92 and a 94 AX-15 for when it decides to kick me in the arse. Link to comment Share on other sites More sharing options...
mnkyboy Posted March 11, 2015 Share Posted March 11, 2015 92/93 AX15 should also have the same .750 input as the 94 up trans they are just internal slave instead of external. Link to comment Share on other sites More sharing options...
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