Stuck swing arm bolt

bradjaydoe
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bradjaydoe
Edited Date/Time 8/17/2018 9:21pm
1998 yz125 anyone have a trick for getting a seized swing arm bolt out. Its been soaking in pb for a couple days now. Never seen one this bad
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murph783
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murph783 8/13/2018 11:10am
8/13/2018 11:10am
Heat is your friend, put a nut on the end of the threads so that when you’re hitting it, you don’t peen the end of the bolt over. Also instead of pb I’ve had good luck with a 50/50 mix of acetone and atf
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kb228
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kb228 8/13/2018 11:27am
8/13/2018 11:27am
Try seafoam deep creep. Its a lot better than pb blaster. Next heat the swingarm up to 200 degrees and then blast that bolt out with an impact if a ratchet wont get it.
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bradjaydoe
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bradjaydoe 8/13/2018 1:08pm
8/13/2018 1:08pm
Ok, im gonna try both of these methods until something works
Premix
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Premix 8/13/2018 3:02pm
8/13/2018 3:02pm
Kroil Oil. Went through this on a 97 YZ I just got done restoring. Lay Bike on its side and spray that throughout the course of a couple of days. Heat will help too
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Johnny89superbike 8/13/2018 8:05pm
8/13/2018 8:05pm
I've had one stuck rear bad on a YZ250F, all the different liquids & heat did not work this time. I had to sacrifice the pivot bolt and drill into each side of the bolt, using a drill-bit that would reach at least halfway. The reduced wall thickness allowed the bolt to shrink slightly allowing it to come out.
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bradjaydoe
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bradjaydoe 8/14/2018 7:31am
8/14/2018 7:31am
Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press from harbor frieght would break it free, would that be a bad idea?
kb228
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kb228 8/14/2018 7:44am
8/14/2018 7:44am
bradjaydoe wrote:
Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press...
Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press from harbor frieght would break it free, would that be a bad idea?
Heat the swingarm. Aluminum expands faster than the steel bolt, thus creating room between the two. An impact will get it out. No, a press will not get it.
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mx317
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mx317 8/14/2018 9:18am
8/14/2018 9:18am Edited Date/Time 8/14/2018 9:20am
Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as well. Heat and a big ass hammer! If you have to beat it much, you can count on a new swingarm bolt.
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kb228
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kb228 8/14/2018 10:16am
8/14/2018 10:16am
Im such an idiot. I thought he was talking about the bolts for adjusting the chain. LOL.

The pivot bolt sometimes gets rotated on the end with the flats on both sides of the head. The corners on there will dig into the frame and sieze it up. A screw driver and hammer can free it up.
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526
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526 8/14/2018 11:44am
8/14/2018 11:44am
The Nut is off it sounds like? so an Impact will do nothing...... you need to heat the engine case up because I highly doubt it is stuck the bearings which are pressed into the swingarm. I would keep soaking it while laying on it's side so it can run down inside and use heat as the last ditch effort, using heat is great if you are cautious and you understand the damage that could be done by using it.
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bradjaydoe
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bradjaydoe 8/14/2018 11:47am
8/14/2018 11:47am
bradjaydoe wrote:
Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press...
Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press from harbor frieght would break it free, would that be a bad idea?
kb228 wrote:
Heat the swingarm. Aluminum expands faster than the steel bolt, thus creating room between the two. An impact will get it out. No, a press will...
Heat the swingarm. Aluminum expands faster than the steel bolt, thus creating room between the two. An impact will get it out. No, a press will not get it.
Thanks, is there an impact driver that you would recomend, im sure it would be a good tool too have
bradjaydoe
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bradjaydoe 8/14/2018 11:48am
8/14/2018 11:48am
bradjaydoe wrote:
Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press...
Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press from harbor frieght would break it free, would that be a bad idea?
kb228 wrote:
Heat the swingarm. Aluminum expands faster than the steel bolt, thus creating room between the two. An impact will get it out. No, a press will...
Heat the swingarm. Aluminum expands faster than the steel bolt, thus creating room between the two. An impact will get it out. No, a press will not get it.
I will try that than
bradjaydoe
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bradjaydoe 8/14/2018 11:49am
8/14/2018 11:49am
mx317 wrote:
Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as well...
Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as well. Heat and a big ass hammer! If you have to beat it much, you can count on a new swingarm bolt.
I am pretty sure i already need one ......
bradjaydoe
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bradjaydoe 8/14/2018 11:51am
8/14/2018 11:51am
kb228 wrote:
Im such an idiot. I thought he was talking about the bolts for adjusting the chain. LOL. The pivot bolt sometimes gets rotated on the end...
Im such an idiot. I thought he was talking about the bolts for adjusting the chain. LOL.

The pivot bolt sometimes gets rotated on the end with the flats on both sides of the head. The corners on there will dig into the frame and sieze it up. A screw driver and hammer can free it up.
Thats interesting because it is some what twisted into the frame!
bradjaydoe
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bradjaydoe 8/14/2018 11:52am
8/14/2018 11:52am
mx317 wrote:
Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as well...
Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as well. Heat and a big ass hammer! If you have to beat it much, you can count on a new swingarm bolt.
Do you think mapp gas is enough or should i use a torch?
bradjaydoe
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bradjaydoe 8/14/2018 11:53am
8/14/2018 11:53am
526 wrote:
The Nut is off it sounds like? so an Impact will do nothing...... you need to heat the engine case up because I highly doubt it...
The Nut is off it sounds like? so an Impact will do nothing...... you need to heat the engine case up because I highly doubt it is stuck the bearings which are pressed into the swingarm. I would keep soaking it while laying on it's side so it can run down inside and use heat as the last ditch effort, using heat is great if you are cautious and you understand the damage that could be done by using it.
Do you know a safe temperature, or point i should stop?

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kb228
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kb228 8/14/2018 11:54am
8/14/2018 11:54am
kb228 wrote:
Im such an idiot. I thought he was talking about the bolts for adjusting the chain. LOL. The pivot bolt sometimes gets rotated on the end...
Im such an idiot. I thought he was talking about the bolts for adjusting the chain. LOL.

The pivot bolt sometimes gets rotated on the end with the flats on both sides of the head. The corners on there will dig into the frame and sieze it up. A screw driver and hammer can free it up.
bradjaydoe wrote:
Thats interesting because it is some what twisted into the frame!
Youll have to use a screwdriver to sortof untwist it. It wont come out until you do. Once its straight you can pound it out.
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Rovalova
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Rovalova 8/14/2018 11:59am
8/14/2018 11:59am
Had same thing with a used yz125 I bought.Tried everything from heat to soaking in penetrate type fluids. Rang a mechanic freind and he just said flattley you have to bash them out. I ended up literally using a sledge hammer and had to swing fairly hard till it moved the first 50mm or so. Just be careful of miss hits, I put wood blocks around in case. He did suggest that if you grind the head off the opposing side they tend to come out easier backward. I saved my bolt by cutting the last two threads off as they belled but really need to get a new one.
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mx317
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mx317 8/14/2018 12:06pm
8/14/2018 12:06pm
mx317 wrote:
Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as well...
Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as well. Heat and a big ass hammer! If you have to beat it much, you can count on a new swingarm bolt.
bradjaydoe wrote:
Do you think mapp gas is enough or should i use a torch?



Something like this
kb228
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kb228 8/14/2018 12:09pm
8/14/2018 12:09pm
bradjaydoe wrote:
Couldnt find kroil penetrating oil but i got these [img]https://p.vitalmx.com/photos/forums/2018/08/14/280553/s1200_20180814_150048.jpg[/img]
Couldnt find kroil penetrating oil but i got these


Deep creep is the best around!
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bradjaydoe
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bradjaydoe 8/15/2018 9:34am
8/15/2018 9:34am
bradjaydoe wrote:
Couldnt find kroil penetrating oil but i got these [img]https://p.vitalmx.com/photos/forums/2018/08/14/280553/s1200_20180814_150048.jpg[/img]
Couldnt find kroil penetrating oil but i got these


kb228 wrote:
Deep creep is the best around!
Ok cool, im just going to keep soaking!
kb228
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kb228 8/15/2018 9:44am
8/15/2018 9:44am
Do you have some pics if your issue? Taking a punch or extension and a dead blow hammer will knock that thing right out. Try an air hammer on a rag maybe
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paddyB745
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paddyB745 8/15/2018 12:35pm
8/15/2018 12:35pm
Had the same issue on a yz250. Tried everything and it wouldn’t budge. What worked for me was cooling then rapidly heating. Try packing some ice around the bolt area to cool it off, once the bolt is cold heat up around the engine case area until it’s warm and try beating it out. Might have to do it a couple times but that worked well for me multiple times.
1
Honda Man 66 8/15/2018 1:15pm
8/15/2018 1:15pm Edited Date/Time 8/15/2018 1:15pm
Get an air chisel. Cut the end off of the chisel so you are left with a round end. Use the air chisel with the modified attachment to push out the stuck pivot bolt. I have used this method to easily push out a bolt that would not budge with a sledge hammer.
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bradjaydoe
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bradjaydoe 8/15/2018 7:37pm
8/15/2018 7:37pm
kb228 wrote:
Do you have some pics if your issue? Taking a punch or extension and a dead blow hammer will knock that thing right out. Try an...
Do you have some pics if your issue? Taking a punch or extension and a dead blow hammer will knock that thing right out. Try an air hammer on a rag maybe
I will get some pictures tommorrow

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