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Alien
Apprentice
Canada
149 Posts |
 Posted - Aug 25 2003 : 9:25:07 PM
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Me and Cris (FugitiveEagle) have tried everything to take off the damn blade on that old lawnmower we repaired... The bolt has gone round... We tried Rust Remover, WD-40.. We can't really think of anything else... Is cutting the bolt the only way?? Also i want to remove it because it's very unballanced and makes the whole engine vibrate violently... I either want to change it or fix it somehow...
Also i tried to put it horizontally and it seems to run, i probably have to make some small changes to the carburator so it will run even if the tank isnt full... I'll do this if i choose to make a go-kart... But for now i want to remove the blade, also are you sure it wont run without the blade?
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Andrew
13/m/Canada
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Aug 25 2003 : 9:49:06 PM
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well one method is to heat the bolt with a torch, one time I welded some rebar to a bolt that I couldnt get off, because it was nice and round.
As for it not running, the blade acts as a flyweel to bring the one piston around. riding lawnmowers usually have a flywheel so that you can use them when the blades are disengaged.
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Alien
Apprentice
Canada
149 Posts |
Posted - Aug 26 2003 : 08:51:12 AM
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That's scary after how much WD-40 and rust remover (that is also inflammable) i put on it... What happends when i heat it anyway??? Will it come off easly because it gets smaller... We'll try that but we will have to find out that it dosent start a fire...lol
How come Aaron's Go-Kart motor works if it dosen have a blade.. Does that smaller flywheel do the job?
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Andrew
13/m/Canada
Edited by - Alien on Aug 26 2003 08:56:01 AM |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Aug 26 2003 : 11:41:30 AM
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Well, I would simply suggest using the proper socket and a long breaker bar. But since you already rounded the nut....
1. Weld on another nut or bolt, then remove that using the proper socket.
2. Try a "Gator Grip". It's a universal socket that seems to be able to grip anything
3. Grind off the nut head, remove the bolt, then use a stud extractor to get it out
4. Worst case, drill out the bolt, then retap the crankshaft for a large bolt.
The engine might run without the blade, but it will not idle. The aluminium flywheels on lawnmower engines are too light to keep the engine spinning. The horizontal engine used on my go-kart has a heavy cast-iron flywheel. Most horizonal engines do, since they are designed to be used with a clutch and might not always have a load on thier output.
As for running the engine sideways, DON'T DO IT. The lubrication system will not function if it is turned over. If you want to run it sideways, you will need to modify the carb/fuel tank, and install the oil dipper from the horizonal version of the same engine to provide lubrication to the valves and cylinder.
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Alien
Apprentice
Canada
149 Posts |
Posted - Aug 27 2003 : 9:44:30 PM
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Ok, thanks for all your help Aaron... I'm going to try to remove the blade again. I'm not going to make any changes for it to work horizontally, i'll find another engine similar to yours if i want to make a go-kart...
Andrew
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Andrew
13/m/Canada
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Aug 27 2003 : 11:05:08 PM
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well actually the bolt expands, and thats why its easier to get off.
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Aug 28 2003 : 09:24:21 AM
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Wouldn't expanding the bolt make it a lot harder to remove?
What I have done is to heat the area around the bolt cherry-red with a torch, then apply dry ice to the head of the bolt. Works wonders.
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Aug 28 2003 : 1:54:56 PM
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when the bolt is heated, the molicules expand right, so the bolt has a larger diameter. the indied of the bolt doesnt expand in. that would require the distance between the inner ring molicules to get smaller, so instead they all expand outward. Thats what I thought but I had a big lecture from my physics teacher
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Alien
Apprentice
Canada
149 Posts |
Posted - Aug 28 2003 : 3:02:36 PM
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no when its heated it contracts (becomes smaller) when it's cooled it expands.. Just like water.. I may be wrong though...
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Andrew
13/m/Canada
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Aug 28 2003 : 5:49:38 PM
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no when something is heated it expands...water is larger when it is frozen because of the way it freezes. the molecules try to arange themselfs into these neet little circles (the hydrogens connect)
If you take any element (not compound) and heat it up, then it will require more space than when it was cooler.
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Alien
Apprentice
Canada
149 Posts |
Posted - Aug 28 2003 : 6:46:57 PM
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I did some research and you're right.. so this would only help by welding a new bolt somehow to the rounded one...
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Andrew
13/m/Canada
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Aug 29 2003 : 4:18:53 PM
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Heating something makes it expand. Heating a nut would make it easier to take off of a stud. Heating a bolt would make it more difficult to remove from a nut or other set of threads.
May I ask how you rounded it off?
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Alien
Apprentice
Canada
149 Posts |
Posted - Aug 29 2003 : 4:28:19 PM
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Noo... It was like that when i got it, my neibourgh(sp) probably tried to take it off too... But i helped... I tried but it wouldnt come off it would just get, well... round... Anyway i'm gonna try that soon...
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Andrew
13/m/Canada
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Brian
Apprentice
USA
106 Posts |
Posted - Sep 01 2003 : 02:45:56 AM
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Even though the heat causes it to expand, it still does wonders against anything rusted in place. I'm afaraid I don't know the exact physics of it.
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cirvin
Nobel Prize Winner
USA
1542 Posts |
Posted - Sep 02 2003 : 08:56:17 AM
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for rusted bolts, when you heat them, they expand and push outward, when they cool, the contract and leave a small space around them
next stop: nobel prize winner! |
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da-g-dog
Mad Scientist
USA
231 Posts |
Posted - Sep 02 2003 : 12:51:31 PM
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If you have a grinder, you could grind down two opposite sides of the bolt to make them flat again. Then get a cresent wrench and tighten it down on the two flat spots. Find a piece of pipe or something to use as a breaker bar and pull/push it to loosen the bolt.
hike master kyle |
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Topic |
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Lawnmower blade
