Removing Final Gear Shaft Ball bearing?

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luigipasto
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Removing Final Gear Shaft Ball bearing?

#1

Post by luigipasto »

I want to remove the bearing in the right side engine case that connects to the final drive gear. I attached a picture. It's part number 91002-371-004, #24 on the attached diagram. It's backed by something called the oil path plate B (part number 23161-371-000, #12 on diagram) that protrudes into the middle of the bearing. The problem is that the protrusion prevents the use of a blind bearing remover. I have no idea how to get in there and pull the bearing out as there is no other access from the back of the bearing. I've thought about heating the case and hoping it falls out. I'd rather wait to hear from someone with another idea before a proceed with the torching...
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Re: Removing Final Gear Shaft Ball bearing?

#2

Post by pidjones »

There is another blind puller that spreads to grip the inside of the outer race between balls. Allen Millyard used one three days ago on his Youtube channel polling a Kaw S1 crank bearing.
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luigipasto
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Re: Removing Final Gear Shaft Ball bearing?

#3

Post by luigipasto »

Thanks for the suggestion, that's quite a special bearing puller and unfortunately I don't have one. Also, the bearing puller needs something in the centre of the bearing to push up against and in the case of the bearing I'd like to remove, would probably deform the backing plate. Still looking for a solution......
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Re: Removing Final Gear Shaft Ball bearing?

#4

Post by robin1731 »

I've never done this particular bearing removal but on other similar ones, cases with a bearing in it like that, I just take a propane torch and heat up the area around the bearing. Sometimes it falls right out. Sometimes I need to take a dead blow hammer and lightly hit it a few times from the back side.
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Re: Removing Final Gear Shaft Ball bearing?

#5

Post by luigipasto »

Thanks I think that's what I'll do. Only issue is that the backside is the plate and not the bearing. Hopefully it'll fall out. I'll keep you posted of developments...
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Re: Removing Final Gear Shaft Ball bearing?

#6

Post by robin1731 »

luigipasto wrote: Thu Dec 09, 2021 10:49 am Thanks I think that's what I'll do. Only issue is that the backside is the plate and not the bearing. Hopefully it'll fall out. I'll keep you posted of developments...
Yes, it is a plate on the ones I have done too. If it was the bearing it would be easy to get out. ;)
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Re: Removing Final Gear Shaft Ball bearing?

#7

Post by cfairweather »

Another way is to use a flat headed screw driver. Just insert the screwdriver into the small hole and tap it. The wedge will pop it right out.
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Re: Removing Final Gear Shaft Ball bearing?

#8

Post by Old Fogey »

I've changed that by heating the case; just a bump on the bench and it will fall out. Bearing 6304C, the C is important as it signifies greater clearance for heat.
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Re: Removing Final Gear Shaft Ball bearing?

#9

Post by luigipasto »

OK, thanks.
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Re: Removing Final Gear Shaft Ball bearing?

#10

Post by Rednaxs60 »

I removed mine when I rebuilt the 1200 engine. I take it the cases are split? If not, worst case if all else fails is to split the engine cases and get in behind the bearing with a long, narrow drift/punch. There is a small hole in back, think you have to have the crank out. Comes out fairly easy, but I've mentioned the downside. The oil path plate will come out easily once the bearing is out. This bearing is more an interference fit than a press fit.

Nice to replace bearings, but is this one not turning freely? I had to change mine because it was seized, replaced the alt shaft bearing for the same reason. Yours looks good comparatively:
Final Drive Bearing.jpg
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If you don't want to put a torch to the area, and the fit of the bearing into the case is a slight interference fit, possibly use a small steam cleaner to heat the area.
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Re: Removing Final Gear Shaft Ball bearing?

#11

Post by luigipasto »

Yes, Rednaxs60. Cases are split and empty except for this bearing. Thanks for the tip. At this point, this is really all academic as I'm trying to learn this engine well. The bike it came from was sitting outside for about 20 years, and hadn't been started in at least 10. I thought this was a good opportunity to learn in detail and restore. It's been fun so far, especially since the con-rod bearings look really good and I've already purchased replacement main bearings. I look forward to the reassembly...
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Re: Removing Final Gear Shaft Ball bearing?

#12

Post by Rednaxs60 »

What are you using for piston rings? These are probably getting scarce. A fellow Canuckxxxx used a set of 2002 Chevy Tracker 1.6 litre ring set in his 1100 (?). I used the 2002 Chevy Tracker rings, 1.0 mm oversize and adjusted to fit in my 1200 engine rebuild. Had a generic set from Japan but the engine smoked on initial start in the morning - getting rid of this blue smoke exhaust plume was one of the reasons for the rebuild. Put in the set from the Chevy Tacker, made by Hastings, and no more smoking on start. Good compression as well.

Good luck.
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Re: Removing Final Gear Shaft Ball bearing?

#13

Post by luigipasto »

I've found piston a ring sets on eBay and at Randakks. I'm having someone assess the cylinders to see if a rebore is required then take it from there. Thanks for the info. regarding the Chevy Tacker rings. Why do you think the generic set you used led to burning oil? Were the rings to spec?
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Re: Removing Final Gear Shaft Ball bearing?

#14

Post by Rednaxs60 »

The rings were to spec, but quality is an issue, or it was how I installed them, no up/down. I wasn't burning oil, just had a small oil build up in the cylinders on initial start that I was not a fan of. Could be that I fitted the new rings for each cylinder and the end gap was more precise. When you do yours, check the rings for each cylinder and check end gap IAW the service manual before install on the pistons.

Better quality piston rings have orientation marks, non on the generic set. Some of the rings were beveled that helped in orienting the new rings. The generic set did not have any beveled rings, or a way to determine ring orientation.

The machine shop installed the rings on the pistons, and as such, I left these alone and did not check the rings for end gap fit. Did align the rings on the pistons for install in the cylinders IAW the service manual.
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Re: Removing Final Gear Shaft Ball bearing?

#15

Post by luigipasto »

OK, that's very good to know and I'll definitely keep it in mind as I go along. Thanks for the education. All the best....
1975 GL1000, on the road but patiently awaiting restoration
1976 GL1000, in the middle of a frame-off restoration.
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