Sapo_feo
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Does anyone know the composition of 285CD Crankcase? Is it pure mag, or 60/40 aluminum/magnesium, cast aluminum or something completely different?
I don't know if this helps or not but....
If I remember correctly we used to check castings being repaired by cleaning a spot with a file, Magnesium will foam if acetic acid (white viniger) is applied to a bare spot of metal, Aluminum will not. Also if you have a scrap of cast aluminum to compare it to the Magnesium will be noticably harder if you can pass a file over it.
IDK about the alloys though..... hopefully one of the gurus will chime in
opcorn:
Thanks for the info. I haven't found any easy way to tests at home what alloy a case is. I was hoping for a casting mark. AZ91E is the only alloy I have worked with and it is about 9% aluminum. I am wondering if there is such a thing as a casting alloy with 40% or if it's just a sales pitch from HTS-2000. I have noticed that they only have demo videos of solid and clean aluminum and no pot metal, white metal or any of the other metals they claim to braze with ease. Has anyone tried using it on a chainsaw case?
Does anyone know the composition of 285CD Crankcase? Is it pure mag, or 60/40 aluminum/magnesium, cast aluminum or something completely different?
So far anything I have found on the case says it is cast magnesium. Does anyone know if it is pure? I am looking at a 285 with a pretty serious case crack and am wondering about welding options. If it's 60/40 alum/mag I could try out some of that HTS-2000, if it's pure or some other alloy I'll pass since mag tig rods are expensive, and so is the guy who uses them.
Sounds like you're gonna pass?It's a crack through the dawg bolt holes on the clutch side. I tested some HTS-2000 on an old briggs intake that has snapped in half. The repair looked ok, but the next day I picked it up and it splintered into cubes. Perfect 1/4 cubes. I emailed the company and they said sometimes that happens if the casting is less than 40% aluminum. I don't want my case falling apart. I saw a case half on ebay, but I really don't want to split it and deal with bearings and such. I'm hoping to get a carcass from the saw shop to test on. Since I already spent my money on the HTS I don't think I'll be trying a different brand any time soon. Thanks for the information. It loks like there may be light at the end of this tunnel after all.
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