Cotter Pin (?) Backing Out

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Hungry J0e

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Cotter Pin (?) Backing Out


Changing my oil lines on my 850 Mki III to attempt to cut down on leaks (old lines were made of 3/8" fuel line hose). Pulled out the oil filter, I noticed the nut on the lefthand cotter pin (at least that's what I think it is...) appears to be backing out, or the pin is dropping (doesn't seem right...).

Other than tightening up on the bolt, is this an issue I need to concern myself with?

Cheers,

- HJ
 
Naw, most Commando's don't even have that feature, but it does stifle the spindle wobble wear and might be felt as less a subtle short twitch on fast direction changes. Might locktite or safety wire, if threads still good.
 
Hungry J0e said:
Cotter Pin (?) Backing Out


Changing my oil lines on my 850 Mki III to attempt to cut down on leaks (old lines were made of 3/8" fuel line hose). Pulled out the oil filter, I noticed the nut on the lefthand cotter pin (at least that's what I think it is...) appears to be backing out, or the pin is dropping (doesn't seem right...).

Other than tightening up on the bolt, is this an issue I need to concern myself with?

Cheers,

- HJ
Click to expand...

MkIII swingarm. Not sure what's happening there. Can you tighten the nut? Is there enough thread to do so?
 
Hungry JOe,

The spindle when fitted was a good fit and because of that tightness probably not orientated correctly. The cotter pins would have been pulled down to the correct torque but not enough to turn the spindle. After a few miles of use the spindle turns and the cotter pins drop. Try tightening up the other cotter pin you should find it slack too.
Shouldn't cause a problem once tight.

Been there done it. :(

Cash.
 
Hungry J0e said:
Other than tightening up on the bolt, is this an issue I need to concern myself with?
Click to expand...

My MkIII's cotters look the same-except that it's the right hand cotter which is lower than the left, and the cotter nuts fitted to mine are self-locking type. I checked them and both were tight-so I don't think this is a problem.
 
The loose cotter pin snugged up nice... the other not so much. Since I already had the oil tank and lines out, pulling it was no big deal...

Cotter Pin (?) Backing Out
 
Oh Ugh, now what? Live with it or bite bullet to bring back to spec if internal threads boogered too?
Boy if these Commandos weren't so cute there'd be a bounty on them.
 
hobot said:
Oh Ugh, now what? Live with it or bite bullet to bring back to spec if internal threads boogered too?
Boy if these Commandos weren't so cute there'd be a bounty on them.
Click to expand...

It's a cotter pin, there aren't any "internal threads"?
 
Oh OK I've a lot to learn about 850's. So just put another in after clearing path and ride on? Wonder how that damage happened to only one side? May reveal some principles of road loads I can use.
 
hobot said:
Oh OK I've a lot to learn about 850's. So just put another in after clearing path and ride on? Wonder how that damage happened to only one side? May reveal some principles of road loads I can use.
Click to expand...

Cotter Pin (?) Backing Out
 
hobot said:
Wonder how that damage happened to only one side?
Click to expand...

Possibly the result of an abortive attempt to fit the cotter pin when the spindle slot was slightly out of alignment with the cradle cotter hole?
As I think the damage to the pin suggests that it was not fully in the slot when either pulled or knocked into position?
 
L.A.B. said:
Possibly the result of an abortive attempt to fit the cotter pin when the spindle slot was slightly out of alignment with the cradle cotter hole?
As I think the damage to the pin suggests that it was not fully in the slot when either pulled or knocked into position?
Click to expand...

That's my guess as well...
 
swooshdave said:
hobot said:
Oh OK I've a lot to learn about 850's. So just put another in after clearing path and ride on? Wonder how that damage happened to only one side? May reveal some principles of road loads I can use.
Click to expand...

Cotter Pin (?) Backing Out
Click to expand...


Do these pins engage the slots on the spindle ? Not having this type of swing arm I am trying to figure out what the cotter pin is holding. I didn't know what to look at in the photo and on the schematic the alignment isn't crystal clear.
 
Oh yeah the graphic makes it plain Norton came up with better solution than the collars/bolts, with the pins sliding down into the spindle slots, Cool. I still don't see how even one could be so chewed up with Norton design.
 
hobot said:
Oh yeah the graphic makes it plain Norton came up with better solution than the collars/bolts, with the pins sliding down into the spindle slots, Cool. I still don't see how even one could be so chewed up with Norton design.
Click to expand...

Well the other pin came down easily when I replaced the nut with a locknut and now has much more thread exposed. So I think the spindle was out of alignment as LAB suggests when assembled. I ground out the gash in the other pin and cut off the portion with the stripped threads. It drops down farther than before and I can get the nut on the bottom end but only with a few threads exposed...

Since it's easy to access right now I'll order a fresh pin and sit on my hands for a few days until it arrives.

Cheers,

- HJ
 
Hungry JOe,
The spindle when fitted was a good fit and because of that tightness probably not orientated correctly. The cotter pins would have been pulled down to the correct torque but not enough to turn the spindle. After a few miles of use the spindle turns and the cotter pins drop. Try tightening up the other cotter pin you should find it slack too.
Shouldn't cause a problem once tight.

Been there done it. :(
Click to expand...
That's what I was trying to say, the spindle wasn't aligned with the cotter pins and was too tight for the cotter pins to force it into possition.

I know should try harder
Cash.
 
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