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Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Hello all, i cracked the crankcase cover on my scooter. Im not having much luck getting a replacement part, but basically the kickstart lever's bearing was ripped off the casing. Ive filed and cleaned it all down so that it fits back in place flush. My question is, is it possible for an epoxy to hold this together?It basically needs to withstand my stepping down on it to start the engine.Ive got some steel weld epoxy but it just held for alittle bit while i tested out the gears and then broke again.
Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
JB weld is pretty good, but how badly cracked is it? Have you just torn the bearing out, or is the case physically got a crack in it? If it just a bearing issue, get an over sized bearing, bore out the hole in the crankcase cover _very_ slightly smaller, throw it in the oven for a while, then pressfit the new bearing. I had exactly the same problem with my kwak. You might even be able to get someone to weld it, then grind it back flush.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Its the whole bearing that holds the gears in place. Its completely torn out. I took alot of time sanding it down so it will fit flushly with the case and have spent all day claning and sanding the area to bond. I think i didnt mix the epoxy sufficiently last night nor did i clean the area at all. Toight the epoxy set really fast and is getting very very hard. Tomorrow afternoon i will try it out. This is just a temp fix, as i wait for a new cover... I have few tools. No power tools but a drill. A file and some sand paper is it If this doesnt work, i will try an epoxy that mixes easily and has a lower viscosity for a better application. That 2 ton stuff looks sufficient, as that is WAY more force than i can exert on it, and its meant for metal as well...
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
IMHO, you should never sand things with rough break like cast iron--and other things with a smooth break/cut edge should only get a light sanding. This is because while epoxy is good at adhering to stuff, it is very weak. So you want to minimize the amount of 'filer' epoxy in the cracks, you just want a thin layer between the pieces. That is what I have found to work best...
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
... wrote ...
IMHO, you should never sand things with rough break like cast iron--and other things with a smooth break/cut edge should only get a light sanding. This is because while epoxy is good at adhering to stuff, it is very weak. So you want to minimize the amount of 'filer' epoxy in the cracks, you just want a thin layer between the pieces. That is what I have found to work best...
I put a bunch of epoxy on there..Could hurt?I used fine sand paper to "finish" the spot where epoxy would be applied. Its rock hard, can barely scratch the stuff, so i will wait till tomorrow and try it out. If this doesnt work, i may look for a place that will weld it for a small price.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Well, didnt work...Boy that stuff is hard once it sets, but barely could stand the strenght of my stepping on the starter. I guess epoxy just isnt good at all for force applications, just trival things like filling holes.
Its either the dang parts place that never answers anymore, or a welding shop in town here... Thread over, epoxy is no good for this sorta thing:-(
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Bonding Cast Iron with Epoxy-broken crankcase cover
If this doesnt work, i will try an epoxy that mixes easily and has a lower viscosity for a better application. That 2 ton stuff looks sufficient, as that is WAY more force than i can exert on it, and its meant for metal as well...