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Old 11-14-2010, 11:43 AM   #1
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50 Piston Pin is Stuck

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Old 11-14-2010, 12:18 PM   #2
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slowly heat the piston, hopefully it will expand enough to let you slide the pin out. the aluminum piston should expand quicker than the steel pin.
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Old 11-14-2010, 12:24 PM   #3
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Use a penetrating oil like Kroil or something similar. Give it some time to seep in.
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Old 11-14-2010, 12:40 PM   #4
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I have coated it with WD40, but dont think that will be sufficient. I will pick up some KROIL and see how that works, I 'm just scared to put to much pressure on tapping it since its such a small motor, and I dont wanna tweak the connecting rod or crank connections
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Old 11-14-2010, 01:49 PM   #5
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did you get it off?
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Old 11-14-2010, 02:27 PM   #6
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I have coated it with WD40, but dont think that will be sufficient. I will pick up some KROIL and see how that works, I 'm just scared to put to much pressure on tapping it since its such a small motor, and I dont wanna tweak the connecting rod or crank connections
you can try sliding the top end back on over the piston to hold it while you get a socket that's a similar size to the pin and tap it out that way. I don't know how comfortable you feel about doing this.
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Old 11-14-2010, 02:50 PM   #7
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That sounds logical I will try this in a bit , thanks guys
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Old 11-15-2010, 01:03 AM   #8
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If none of that works, I've had success going with an air hammer. The rapid small blows tend to free it up. Luckily on that motor you don't have to be super gentle. It would take some work to bend a rod & the crank bearing should be a roller bearing.
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Old 11-15-2010, 01:48 AM   #9
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If none of that works, I've had success going with an air hammer. The rapid small blows tend to free it up. Luckily on that motor you don't have to be super gentle. It would take some work to bend a rod & the crank bearing should be a roller bearing.
What he said!
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Old 11-15-2010, 10:34 AM   #10
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Still havent gotten that little off the connecting rod yet! An 8mm socket fits the pin perfectly but I wasnt able to tap it enough to free it up. I dont have an air hammer, but will see if I can get one, if not I will just keep at it.
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Old 11-15-2010, 10:49 AM   #11
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Did you try the Heat? That should work. Just be sure to clean off all the solvents and oils, because it might flare up on you.
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Old 11-15-2010, 10:51 AM   #12
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I have a mini torch that I was gonna try with tonight, that was my next method and seems like it should free it up. Good call on the cleaning of lubricants, definetly dont wanna burn my garage down. Should I just evenly heat the outer edge of the piston on a low heat?
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Old 11-18-2010, 10:50 AM   #13
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I tried heating the piston up but to no avail, I also tried hammering it with the piston secured with the old head, but this thing is stuck, its always one little thing that holds these projects up!
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Old 11-18-2010, 11:13 AM   #14
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You need someone to back up the other side while you hit on it.
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Old 11-18-2010, 11:19 AM   #15
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motor on its side small piece of pipe on piston around the pin to hold back up so u can get a good hit on it this should also prevent the rod from bending
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Old 11-18-2010, 07:44 PM   #16
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That sounds logical I will try this in a bit , thanks guys
I'm sure you've already tried this, but did you remove the clips from both sides and try taking the pin out in the other direction?
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Old 11-19-2010, 11:27 AM   #17
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Thats the problem, the clip came out fine from the left side, but the pin has slid over the clip on the right side so its kind of wedged in there over the top of the clip and it wont budge.
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Old 11-19-2010, 11:35 AM   #18
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get a bigger hammer.. lol

I hate to say that becuase your working on the engine but it sounds like it's stuck pretty good. Bigger hammer and heat the piston again.
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Old 11-19-2010, 11:35 AM   #19
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Are you trying to save the old piston or pin? Take a small cut off wheel to that chit.
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Old 11-19-2010, 11:39 AM   #20
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^ Yeah I dont need the old piston or pin, but I do need the clip. I think I am gonna have to just make sure the connecting rod and piston are backed all the way into the bottom end, put the old cylinder back over the top of the piston and just heat and bang that out of there, anyone have an air hammer I can borrow? I could probably get one at Harbor Freight for 25$
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