How to take main and crown gear apart?

[SKYBLUE]

Hi guys, I am trying to take the crown gear off the main gear to re-grease the sprag bearing but I am having a hard time doing so. The crown gear axle wont slide out of the main gear assembly; it seems to be stuck in there pretty good. You guys have any ideas on how to get this unit apart?

Also I just noticed that my clutch bell moves up and down the clutch shaft slightly. Is that normal? My machine is a tempest FAI.

Thanks for any replies.

[conrod]

Clutch bell shouldn't move up and down.
I locktite my startershaft to the inner race of the bearings.

Try rotating the crown gear while pulling up. This seems to make removal easier for me. If mine is really stuck, I press it out w/ my drill press. I've got a lathe so I made a special tool to remove these( read have to justify the cost of lathe) :wink: . A socket with the right OD will work just as well.

[SKYBLUE]

Ok I found out why my clutch bell moves up and down now. The pinion unseated itself from the bearing block on top of it therefor causing the pinion to have up and down play.

Anyone else have tips on how to remove the crown gear from the main gear hub?

[DavidH]

As Conrad said the clutch bell should not move up and down on the clutch shaft. Sounds like maybe the pinion that is suppose to be loctited into in the lower bearing in the bearing block has came loose. But even if it has came loose, the clutch bell still should not be moving when everything is bolted into the Tempest.

As for the constant drive unit, if you have a rubber mallet. Hold the unit in your hand and hit the shaft that protrudes out the bottom with the rubber mallet. This should break the shaft loose for you to pull it on out. Once you get it out, the shaft will probably have a slight groove worn in it. Take some 600 grit sand paper and some oil and wet sand the shaft back smooth. I have had to do this a couple of times.

David

[SKYBLUE]

David, do you know what could have caused the pinion to be sepearted from the bearing block?

[DavidH]

Maybe the motor wasn't exactly straight in the model and the heat generated cause the loctite to release. I have had this happen a couple of times. I just clean the end of the pinion and the inside of the bearing good with acetone. Then I apply red or green loctite to the outside of the pinion and insert it into the bearing.


David

[SKYBLUE]

David, I have the Tempest FAI model with 8.18 gear ratio and a OS 91PS. I am using the motor shims that came with the kit; 2 on each side of the motor, 1 thin and 1 thick shim. The motor alignment looks pretty straight to me. I checked it with the alignment tool that came with the kit and the gap between fan and clutch is evenly spaced out. From your experience, how many shims of what thickness would you use for the motor mount for the 8.18 and OS91PS combo? Thanks again.

[DavidH]

I use a feeler gauge to check if the motor and fan hub are square to the clutch driver. I take a .030 feeler gauge and check the clearance between the fan hub and clutch driver at 90 deg intervals. I do this without turning the fan hub. If the forth and aft is not the same distance I have adjusted with shims. If the the left and right is not the same, I have opened the holes up in the motor a few thousands so I can move it around. I don't use the 8.18 ratio in my Tempests. So I am not familar with what shims it takes to achieve it.

David