2nd Generation Specific 1986-1992 Discussion

How To Remove Input Shaft Bearing?

Old 06-27-2004, 11:58 AM
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Aight guys i replaced the throwout bearing and it was somewhat broken but I guess having a good one in there now is amplifying an already bad input shaft bearing noise. I want to pull my tranny, open her up and replace this bearing. I want to know what the steps are and what types of pullers I will need and how readily available they are. -Derek
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Old 06-27-2004, 12:06 PM
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I used a 3 jaw bearing puller, had to grind away a bit of the jaws so that it fits into an eccentric shaft.



In the shaft at the back is a small gap, then the bearing, then the seal. The transmission shaft slides into the seal and rolls along the bearing. Once the transmission is out of the way then use the puller. Pull the bearing and seal at the same time, there is a groove in the shaft that accepts clearance for the jaws on a puller (that small gap).



To reinstall, find a metric deepsocket 14mm and put an extension on it to act as a driver. Myself and a few others noticed that most 14mm 3/8 drive deep sockets are a size to size fit in the flywheel side of the eccentric shaft, no need to buy a profession installer kit. Just tap gently and make sure you have the bearing packed with multipurpose grease.



I can't remember when you install the pilot bearing if it will stop and leave the gap clearance. Just to be safe tap it in gently until there is enough clearance for the pilot seal. Make sure to hit the seal with grease too.



Also just for future reference, replace the pilot bearing every time you have an opportunity (such as when you did the throwout). It's recommended you do it everytime you have access to do it (apparently they are shortlived bearings?).
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Old 06-27-2004, 12:09 PM
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Oh yeah a 3 jaw puller from a cheap-o brand tool store works just fine and they are like 30 bucks. As I mentioned don't bother with a seal/bearing driver kit, after you pull out the bearing find a socket that fits perfect inside the shaft which is usually a 14mm 3/8 drive deep socket.
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Old 06-28-2004, 03:34 AM
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I am talking about an input shaft bearing inside of the tranny, not the pilot bearing.
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Old 06-28-2004, 08:43 AM
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Oh whoops
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Old 06-28-2004, 09:46 AM
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pull tranny, pull the front cover off the trans, remove snap ring from bearing and spacer if it has one. the na has thru bolts on the trans case, remove these, lay trans on the ground. mazda has a bearing "pusher" for this but if you're gentle with a plastic hammer it will work, or sometimes you can just wiggle it. gently tap the input shaft. the bearing has a snap ringy thing on the out side and as you tap you'll press the bearing off the input shaft, you're also removing the bellhousing from the trans.
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Old 06-28-2004, 11:28 AM
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so it doesnt sound too hard besides having to pull my tranny out and opening the whole thing up bell housing included and from what you tell me besides some snap ring pliers I dont need any special tools or sockets, just the hammer right?
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Old 06-28-2004, 01:34 PM
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if you have the puller and pusher it helps but not needed
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