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  #41  
Old 08-05-2009, 08:56 PM
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i was thinking that but my freind thought it would get up past 500*in this spot i dont think it would

idk what to try now durafix or jbweld. lol cant decide.
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Old 08-05-2009, 09:00 PM
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Durafix is a solder (think metal on metal)
JBWeld is an expoxy (think glue)
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Old 08-05-2009, 09:53 PM
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yeah i know but i still cant decide i could do jb weld right now get the engine together and get a valve spring compressor and get it done in like 2 days or get the torch and the compressor then get it done in like 3 to 4
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Old 08-06-2009, 04:13 PM
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i dont think jb weld will like oil from the case.... at least durafix it or have it welded
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Old 08-06-2009, 04:24 PM
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JB weld unaffected by any oil, hot or cold.
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  #46  
Old 08-06-2009, 04:46 PM
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Don't get no propane torch. Not hot enough. You have to be able to heat the case 700+ degrees
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  #47  
Old 08-06-2009, 05:27 PM
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so a gass torch wont work i gotta bring it to my freinds house DAMB IT. i dont feel like luging this thing around its freaking heavy enough lol.
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Old 08-06-2009, 06:35 PM
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A fuel-oxygen torch is best. Propane-oxy and mapp-oxy torches are cheap and available at most home centers, with a bottle of fuel and a bottle of oxygen. For a DIY, one-off project this is your best bet.

Acetelyne/Oxygen torch can be used, however the operator of this torch must have aluminum experience because the point between "structure" and "liquid" is a very small temperature range on aluminum.

I've never used JBWeld for any kind of repair I'd consider permanent, even though it's uneffected by moisture, oil, gasoline, and so on. There are very few things I'd glue/epoxy together. An engine case is not one of them.
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Old 08-06-2009, 06:47 PM
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Quote:
There are very few things I'd glue/epoxy together. An engine case is not one of them.
Why not?
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Old 08-06-2009, 07:44 PM
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Epoxys will not work, the oil eats through. Been there....
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Old 08-06-2009, 07:46 PM
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even jb weld.
and i was going to go out and get a mapp gass torch tomorrow. dad got a tooth pulled and didnt wana go anywere.
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Old 08-06-2009, 07:50 PM
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Have used it on outboard motor crankcases.
Can't find a more 'worst case scenario' than that.
Four stroke crankcase pressures far less demanding than 2 stroke.
Never had a problem. Been there....
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Old 08-07-2009, 08:29 AM
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I have jb weld on a cracked Honda CB 350 oil pan. It's been that way for 6 years now. That was just a crack though. I don't know how well it would work on a large area.
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Old 08-07-2009, 01:52 PM
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well my dad came home from work today with a present for me! a propane torch and a bottle of mapp gas!
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Old 08-07-2009, 08:39 PM
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well i tryed propane it didnt work. trying mapp gass tomorrow. if that dont work JB WELD. lol
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Old 08-09-2009, 02:35 PM
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Those durafix rods WILL do the trick.... Watch the videos on youtube and follow every step exactly. Its not like welding where cleaning isnt completly necessary. Think of it as glue... If the two surfaces artnt sanded completly and tinned correctly it will not work. As stated before melt the rod with the heat produced from the parent metals not the flame itself or it will not work. I have experience with these braze rods and welding. You can get away with using mapp has but it may take as long as 10 min of holding the flame on the parent metals and never take the flame off cause you lose 200 degrees once the flame is removed instantly.
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Old 08-09-2009, 02:38 PM
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Alright well i was using propane and of course the mapp gass wont fit on the torch so one day when my freind gets over here im going to tell him to bring his torch but not his bottle.

and i didnt know u lose that much heat when you take the flame away!
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Old 08-09-2009, 03:34 PM
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Aluminum is a common material for heat sinks for semiconductors, automotive radiators, hydraulics systems, air conditioners (window and central), computer heat sinks, and so on.

It sucks heat away like you would not believe, which is why you have to really heat it up good.

Another option that may help is to turn the block so the cracked piece is upwards, clamped in place. Heat it from underneath, then dab the rod on top.
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Old 08-09-2009, 03:44 PM
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I also tryed heating it from the bottom. but i belive that was before i beveled the outer edge of the broken peice on my grinder. i would work on it now because im a little more energetic. for some reason taking a shower really helps!

well one of these days im borrowing a tip for a mapp gas bottle the propane torch dont fit the mapp gas bottle.
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Old 08-09-2009, 04:17 PM
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Really? My propane torch uses propane tanks and mapp tanks just fine. It's the oxygen bottle with a reverse thread. Maybe the newer stuff is different? If so, my apologies for steering you in the wrong direction.

Worked for me so it seemed to be a reasonable piece of advice!
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