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Post by gingel on Mar 5, 2015 16:59:40 GMT -5
Hi, As part of rebuilding the engine i replaced the gearbox bearings, and i have some questions and maybe you can help. When i installed 2 of the bearings in the engine block side i noticed that they are not completley aligned with the top end of the bearing seat. The bearing is about 0.5mm higher. but they just will not go inside more. I don't remember how it was before i took the bearings out. Is it supposed to be like that? Here is a picture of the final drive shaft bearing (engine side), and you can see it is out about 0.5mm : Here is a picture of the driving shaft bearing, also not completley aligned. Btw, before i installed the shaft i put it in the freezer, and heated the engine case with an heat gun. The shaft with the bearing on it just slid in very easily. Here is the picture of the counter shaft bearing (engine block side), and here you can see it's fully down in the bearing seat. Before i took out the old bearings, i did noticed that the gears have mark lines on them and that they are aligned with each other. When i put the gears inside after installing the new bearings, the mark lines do align with each other. Does that mean that the bearings are seated ok? Here is a picture of the mark lines on the counter shaft and driving shaft gears (after installing the new bearings). You can see they are aligned. What do you think? Thank you.
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Post by geh3333 on Mar 5, 2015 18:44:50 GMT -5
I replaced all the gear box bearings over the summer in my 150cc , which looks to be exactly the same , but I could be wrong about that . can u tap the bearing in any further ? I used a big socket which was the same size as the outer bearing , and tapped it in with a hammer. You don't want to pound on the inner bearing while inserting them . you should eventually get them in completely . also if I'm not mistaken I noticed the same thing on mine " with it seeming like the bearing was not in completely. I can't remember if that's normal or if I was able to tap it in completely even or not . it may just be the shape of the case . I'll be getting into my gearbox on Saturday to change a seal so I can tell u then .
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Post by bashan on Mar 5, 2015 19:26:30 GMT -5
The bearings are slightly elevated out of the seat. If the box went back together without a struggle don't worry about it. Here's a pic from one of my rebuilds, you can see the bearings are not flush. Why that one of yours is I don't know:
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Post by geh3333 on Mar 5, 2015 19:53:34 GMT -5
The bearings are slightly elevated out of the seat. If the box went back together without a struggle don't worry about it. Here's a pic from one of my rebuilds, you can see the bearings are not flush. Why that one of yours is I don't know:
Yep , the bearing on the left looks identical to his , and I'm pretty sure I noticed the same thing g when replacing mine . just work with it you'll get it to fit correctly.
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Sophomore Rider
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Post by gingel on Mar 6, 2015 15:48:21 GMT -5
The cover went back very easy, and when i rotate the driving shaft, the final drive shaft is moving smoothly. so i guess it's all okay.
Thank you.
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