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Old 12-07-2014, 05:42 PM   #1
wmtunate OP
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Metal shards in swingarm



'84 R80

I'm planning on sending out my final drive for a spline rebuild, and I found a bunch of metal shavings/shards where the final drive bolts to the swingarm, mostly collected near the swingarm drain plug. Any ideas what they might be from? The largest is about 3/8" long.

I don't have any noticeable play in the driveshaft u-joint, and the output flange on the transmission looks good. The mating cup on the driveshaft looks good also.
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Old 12-07-2014, 06:02 PM   #2
Bill Harris
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I don't recognize any of that shrapnel. There is not that much back there-- the driveshaft bolts can loosen and tear things up. And there is the cush drive in the driveshaft, which might be the big possible source of bits.





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Old 12-07-2014, 06:45 PM   #3
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The big spring can break but it doesn't look like a piece of the spring. Or does it? Do you have the driveshaft out of the swingarm? I think you are going to have to investigate.
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Old 12-07-2014, 07:00 PM   #4
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Another possibility
At some time the swing arm bolts came loose and the drive shaft has contacted the inside of the swing arm.

Remove the swing arm and look? Or use a small mirror and look inside from the rubber boot area.
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Old 12-07-2014, 07:06 PM   #5
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He'll have ample time to examine the swingarm while the FD is off for refurbishment. Tis indeed an odd situation.

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Old 12-07-2014, 07:22 PM   #6
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Maybe pieces of the spring seat?
Part number 6 in bl's post.
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Old 12-08-2014, 05:30 AM   #7
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Kinda looks like some black paint on them?! Maybe it did come loose and a bolt interacted with the swingarm and dug those bits out?? Weird...
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Old 12-08-2014, 08:01 AM   #8
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Yeah, looks like i'm going to have to pull the swingarm. It's probably due for a refresh anyway, as it's just about the only part on this bike that I haven't dismantled yet. Now to find a 27mm socket...
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Old 12-08-2014, 08:31 AM   #9
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Quote:
Originally Posted by wmtunate View Post
Yeah, looks like i'm going to have to pull the swingarm. It's probably due for a refresh anyway, as it's just about the only part on this bike that I haven't dismantled yet. Now to find a 27mm socket...
Got mine at my local NAPA.
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Old 12-08-2014, 08:40 AM   #10
Bill Harris
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Quote:
Originally Posted by wmtunate View Post
Yeah, looks like i'm going to have to pull the swingarm. It's probably due for a refresh anyway, as it's just about the only part on this bike that I haven't dismantled yet. Now to find a 27mm socket...
An inch-sized 1-1/16" will work. Six-point is best, and it'll need to have the OD ground/turned down to fit. Ready-made available at Northwoods Airheads: http://www.northwoodsairheads.com/

You need the lock nut tool to do regular swingarm bearing adjustment.

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Old 12-08-2014, 01:02 PM   #11
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Something got chewed up? I hope no one fixed something without cleaning the swing arm out? That's not right! U joint or cush drive. The cush drives do sometimes fail but I see the cush drive on the tranny input shaft failing ten to one over the drive shaft. I guess the factory agrees since they later on seriously beefed up the trans input shaft cush drive and left the drive shaft setup as is.
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Old 12-08-2014, 01:09 PM   #12
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Originally Posted by supershaft View Post
I guess the factory agrees since they later on seriously beefed up the trans input shaft cush drive and left the drive shaft setup as is.
What year did that upgrade happen?
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Old 12-08-2014, 01:42 PM   #13
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What year did that upgrade happen?
I don't know for sure. I think in '87? Somewhere around there. So many people go on and on about the C-clip. The C-clip isn't the half of it! The confusing thing about input shaft cush drive failures is that many people do not call them that. They say 'fifth gear' went out or the 'input shaft gear' failed. Well, sure it did. For the cush drive breaking.

supershaft screwed with this post 12-08-2014 at 01:55 PM
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Old 12-08-2014, 02:47 PM   #14
Renner
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'82-'85 gbx cush susceptible to failure

http://www.largiader.com/tech/airtrans/
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Old 12-08-2014, 04:30 PM   #15
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two thoughts...

Gearbox output flange, if aluminum.....banged up by a loose driveshaft, when bolts (old with WASHERS...perhaps) loosened.
Otherwise, I like the metal scraped similarly from the inside of the swingarm.
Clean it up and hope for the latter and NOT a damaged output flange. However, the flange CAN be repaired, either correctly with aluminum welding or epoxy and aluminum scrap.
Have a nice day.
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