Author Topic: CB750 K4 Transmission, I thought I Screwed Up  (Read 405 times)

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Offline Ssicbx

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CB750 K4 Transmission, I thought I Screwed Up
« on: December 22, 2021, 11:32:59 AM »
Assembled my lower end and now with the engine together, I was watching some U-tube videos and I came across a clip showing the assembly of the transmission.  I was enjoying it until they pointed out the brass bushing that needs to be aligned with the hollow shaft oil hole.  At that point I went O-crap, did I screw up?  I figured I could split the cases in a hour but it would take a lot longer to clean everything up and reassemble.  Being depressed went hunting and came up with an idea.  Didn't shoot anything as they were either too big or too small.  Using my spare trans as a jig, came up with a GO-No-GO wire.  With the end of the wire at 10 mm the wire would bottom out in the hollow shaft if the brass bushing was in the correct position.  If not the wire would not bottom out at the 90 Deg. bend and would stickup about 2 mm.
 
Have put the below together to assist in checking the bushing location.  Don't know if this will work for everybody but I feel it worked for me, the key thing I had was spare parts to use as a jig.  Proceed at your own risk.   
Procedure:
1. Remove cover and some of the shifting linkage to remove the bearing /carrier.  Clean hollow shaft with break cleaner to remove the oil.  (this helps to see)
2. Wire: the shaft oil hole is 5/64" (0.075")and the wire size I use was 0.046".  Bend wire per the picture, ensure the 10 mm bend is from the point to the outer radius.  The length is noted at 140 mm but is can be longer.   
3. The hollow shaft has a oil hole approximately 60 mm in.  Locate this hole and rotate shaft until this hole is on bottom.  This hole will help to locate the inner hole as both holes are on the same plain. 
4. Insert wire and fish around until wire goes into the oil hole.  With wire in place use light and see if wire is bottomed out.  If it is, you're in luck!  If the 90 Deg. bend is sticking up 2 mm, (not bottomed out) the brass bushing is not in the correct position.   (Pictured)