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Old 10-11-2005, 03:49 PM   #1 (permalink)
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2 Questions

I don't have the jeep repair manual, but to replace to rear main seal on a 1990 YJ with the 258. One needs to remove tranny and clutch and what else???

Second does the 1990 YJ with ax-15 have a slave cylinder. I know that seems like a dumb question cuz there is the DOT 3 fluid resovoir so obviously it is a hydraulic clutch. My question is, is the a slave cylinder???? I don't see a slave cyclinder listed in my parts magazine. I have my new clutch kit and don't want to put everything back on without replace the slave cylinder. If there is a slave cylinder where is it????
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Old 10-11-2005, 03:52 PM   #2 (permalink)
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follow the line from your reservoir

It might be internal? A SC isn't exactly a wear item though, if it don't leak really no need to replace it..
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Old 10-11-2005, 04:10 PM   #3 (permalink)
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Well I followed the fluid lines and they only lead to the clutch release bearing. And this is why I'm thinking I don't have an SC. I"m not really as dumb as I'm sounding. I've just never done this before, I don't have a teardown manual, and I want to cover my basis.
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Old 10-11-2005, 04:48 PM   #4 (permalink)
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not sure about the 258 but the 4.0 you DON'T need to pull the transmission/xfer case. As far as a rear main seal is concerned is a I-6 an I-6?

I'm assuming a 2 piece seal. If so try droping the oil pan and taking a look. Pull one cap and you should have access (4.0) anyway.
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Old 10-11-2005, 04:52 PM   #5 (permalink)
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Quote:
Originally Posted by microtus
not sure about the 258 but the 4.0 you DON'T need to pull the transmission/xfer case. As far as a rear main seal is concerned is a I-6 an I-6?

I'm assuming a 2 piece seal. If so try droping the oil pan and taking a look. Pull one cap and you should have access (4.0) anyway.
That is correct for the 4.0. I am also not sure on the 258, but on the 4.0 the crankshaft is often grooved at the rear main seal, and just replacing the seal will not totally fix an oil leak. It will probably slow it down though.
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Old 10-11-2005, 07:54 PM   #6 (permalink)
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the ax-15 has an external sc and can be replaced after everything is put back together........unless its broke don't fix it
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Old 10-11-2005, 08:27 PM   #7 (permalink)
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The slave cylinder on my '91 is internal...
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Old 10-11-2005, 08:39 PM   #8 (permalink)
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You don't have to remove the trans just the oil pan and the last bearing cap.
http://www.neow.org/rms1.html
It an article for a CJ but its the same motor

Last edited by 73jeep; 10-11-2005 at 08:40 PM.
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Old 10-14-2005, 03:42 PM   #9 (permalink)
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If everything is apart right now, go to a junkyard or jeep used parts place (i.e. JWjeeeps0< and buy a 94 and up Ax-15 bellhousing with the external slave cylinder (normally 94 and up Yj's and possibly XJ and TJ's with teh AX15).

I had the internal slave cylinder (I think it is also called throwout bearing) - looks like a cup and acoredon that mounts on the tranny input shaft on the front. It has two lines running to it. That is your slave or throwout bearing, I believe the same thing.

Then from the same junkyard or jeep used parts place, get the hos eand external slave. You can use a clutch kit from a 94 Yj, and be good to go.

I highly recommend doing this at this time to avoid having to tear stuff down again next time the POS internal slave fails again (and it very likely will). Then it becomes a 15 minute job

clucth kit - about $120 includes disk, plate, pilot bearing

used bellhousing and external slave and hose - about $70

not having to deal again in a long time tearing the tranny down PRICELESS

BTW, the pilot bearing may be slightly different on the kit you get (the 4.2, 91 flywheels and 94 flywheels are different, and have difefrent internal and external diameters), so make sure you use the correct one, if the one in the kit does not work for ya. And do not be lazy and repalce it at the same time. Unless your flywheel is too fubar, DO NOT resurface it.

More info on the pilot bearing issue here for future searches :

/forum/jeep-hardcore-tech/267393-not-all-ax15s-created-alike-please-read-suggestions.html

Good luck!
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