SI Manual Transmission - Main shaft bearing replacement DIY by Droopy 128

[Patrick]

Does your makes noise like it gona seize at any moment or sound like it got no oil in there? If you have noise from the tranny and couldn't figure out if it T/O or Main Bearing, indications are follows: Clutch pressed-in and noise went away = Main Bearing (Input shaft bearing) In neutral or driving in gear and hear noises = Main Bearing (Input shaft bearing) If noise is heard with clutch pressed-in = T/O Bearing Transmission Model: PL3-9000 (SI Transmission) - After the tranny is out and on the floor with fluid drained, flip tranny on the flat surface with 2 pieces of wood to avoid damage to the spline shaft (it sticks out a little). - Remove bunch of those 12mm bolts attached to the transmission housing (don't have to remove drain and fill plug). After all bolts removed, tranny will likely still be attached. Don't bang it or pry it apart, cuz you might cause damage to the casing, instead till the tranny to the side and drop it on the floor, and it will come loose. (Don't p/u and drop it on the ground.. just lift the end about 3 inches off ground and a slight drop will do). - Flip back to tranny on the woods and use a screwdriver and insert into crack housing but don't pry it, then used a 3/8 ratchet to remove the Sealing Screw and you will see the Snap Ring which held the counter shaft bearing. - Used a snap ring tool to widen the ring if you have the tool. If not use a needle nose and spread it out and wiggle the tranny casing a bit and it will come apart. Now you can lift the casing straight up. (At this point, a good time to get to know your tranny, gears, syncros, diff, etc..) - Next step is remove the reverse idler gear then use an allen socket and remove the Interlock bolt above the T/O on the spline side of the tranny casing. Once off, the shift arm can be rotate a little and you can lift the mainshaft and countershaft straight up (as a whole unit), may need to wiggle a bit to get it out. Whoa la, there's the bearing. (3rd pix, bearing on bottom left) If you don't have a bearing puller, used a socket and extension and knock it from the opposite side, it not that tight, just few slight tap will do. Careful not to tear up the seal but I would suggest to replace the seal at this time, since everything is out. - Check other bearing for damages, replaces as needed, but usually it's only the mainshaft bearing that goes bad. - After bearing replacement and putting all the gears back. Clean the housing and use RTV to seal up the tranny case. You all good to go.. Did I forget some steps ?? If did, probably not important. lol.

To remove this ad, register today or login if you already are registered!