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  #1  
Old 13-02-2015
rowie rowie is offline
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Stuck Swing arm Bolt

Picked up a 1990 RM250 to restore a couple of weeks ago and while stripping it found the swing arm pivot bearings were severely rusted. With the shock removed, it took some effort to move it and the bearings would complain loudly when the swing arm was moved. Removed the engine mount bolts and tried to lever the engine up. It moved about 15mm and stopped, and no amount of leverage would budge it. Ahh crap...

Thought about it for a while and figured spraying a penetrant in the gaps would do stuff all. So I went a bit agricultural and drilled 2mm holes in the seal caps, the swing arm and the cases.



Sprayed a heap of Bolt Off in them and let it soak for a few hours. Tried again and was able to get the bearings free, but the bolt still went donk when smote mightily with a 4kg club hammer. Left it for week (after refilling the bearings and case every day) and tried again. Still took a lot of solid thumps, but I got it to move about 20mm and it locked again. Hit it back and forth a dozen times, sprayed even more bolt off into the holes and left it for another week. Tried again, and expecting it to still be stuck, gave it an almighty thump and it moved about 1/4 of the way through. 6 thumps later and it was out. Yay!

The cases need a hole fixed and the swing arm has some chain rub damage, so I will get the holes welded at the same time. Too easy, and no press or heat required. Just some patience and perseverance, and lots of Bolt Off
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  #2  
Old 13-02-2015
rideo rideo is offline
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Some good ingenuity there to a problem that hits lots of bikes.

I would say you got lucky more than anything though, as in it wasn't totally seized, when that happens the bikes very life can be in danger as they get to meet 20 or 50T presses.
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Old 13-02-2015
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RMJay84 RMJay84 is offline
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Grab a heat gun from bunnings too if you haven't already got one, those things are a godsend for doing freeing up bolts/bearings
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  #4  
Old 13-02-2015
Gordonmichaellee Gordonmichaellee is offline
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Grease gun

I don't know if it would wok but have you
thought about hreading the holes and putting
grease nipples in them?

Cheers Gordo'
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  #5  
Old 13-02-2015
rideo rideo is offline
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Won't work due to the bearing casing in there.

Some bikes were designed that way in the past and had casings made to allow grease flow but being case hardened steel if they aren't made that way i wouldn't be trying to mod them.

Plus, for less effort it would be easier to pull the bolt now and then like you are supposed to and lube the bearings up.
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Old 13-02-2015
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EdgyAl EdgyAl is offline
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QWERTY would have just pushed it out with his fingers
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  #7  
Old 13-02-2015
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Von Von is offline
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My IT400F getting the treatment with a siezed swingarm bolt. It was drilled with 0.5mm left and then I used a grinding stone.

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Old 13-02-2015
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normanator27 normanator27 is offline
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I had success using a product called plusgas when removing a stubborn swing arm bolt from an XR400 which are renowned for those things being stuck.
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Last edited by normanator27; 13-02-2015 at 07:53 PM. Reason: got the name of the product wrong
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Old 13-02-2015
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hairyone hairyone is offline
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Thank's rowie: Good lesson for us all.
Mind over matter: Man over machine.

Blokes' built it & now a Bloke owns it.
You've imposed yourself & thus now:

I'd be lackadaisy to post & type non-sexist.
I perceive Women as equals: Yet they bite.
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Old 13-02-2015
rideo rideo is offline
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Quote:
Originally Posted by hairyone View Post
Thank's rowie: Good lesson for us all.
Mind over matter: Man over machine.

Blokes' built it & now a Bloke owns it.
You've imposed yourself & thus now:

I'd be lackadaisy to post & type non-sexist.
I perceive Women as equals: Yet they bite.
Love ya posts H1, more often than not they are like a Chinese fortune cookie that needs to be translated, hence make me think.

Not meaning to sound offensive if it does, just too close to where you are to bother sorting out a nicer way of putting it.

I imagine yours could come across that way too to most if they read with a glance.
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