<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'><P>It's like the old saying, bad practice doesn't guarantee bad results, but it's a good bet. Acid derusting gives off hydrogen which can be absorbed by the steel, this isn't much of a problem unless the part is above about 32 HRC and put under tension (like a fastener or the prop drive). Then failure can occur. I'd stick with steel wool. </P>
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<P> <BR>----- Original Message -----<BR>From: "Ron Van Putte" <vanputte@cox.net><BR>To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><BR>Sent: Monday, November 16, 2009 3:36:35 PM GMT -05:00 US/Canada Eastern<BR>Subject: Re: [NSRCA-discussion] Rust on OS1.60 Crank<BR><BR>I would imagine that all crankshafts are heat treated. No adverse <BR>effects of my use of Osmose on the crankshafts I've treated.<BR><BR>Ron<BR><BR>On Nov 16, 2009, at 2:30 PM, jeffghughes@comcast.net wrote:<BR><BR>> Some crankshafts are heat treated, so I'd be carefull using any <BR>> acid based de-rusters. Probably won't hurt anything, but unintended <BR>> consequences can occur.<BR>><BR>><BR>><BR>> ----- Original Message -----<BR>> From: "Ron Van Putte" <vanputte@cox.net><BR>> To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><BR>> Sent: Monday, November 16, 2009 1:18:11 PM GMT -05:00 US/Canada <BR>> Eastern<BR>> Subject: Re: [NSRCA-discussion] Rust on OS1.60 Crank<BR>><BR>> I remove most of the rust from iron/steel items by using fine steel<BR>> wool and phosphoric acid (Osmose). It causes a chemical reaction<BR>> with the rust (ferrous oxide) and converts it into an inert form<BR>> (ferrous sulphate).<BR>><BR>> BTW Osmose works well on the whitish/bluish powder/crystals which<BR>> form on some electrical connections.<BR>><BR>> Ron VP<BR>><BR>> On Nov 16, 2009, at 12:01 PM, Pascoe,Tim [Burlington] wrote:<BR>><BR>> > What’s the best way to clean rust off the crank of an engine, or is<BR>> > it even necessary? I have an OS 1.60 that has very low run time<BR>> > (less than 2 gallons), but had been sitting for a while. I pulled<BR>> > the bearings out as the main looked/felt as if it could use a<BR>> > change. At the same time, I noticed a fair amount of rust on the<BR>> > crank, specifically in front of the con-rod pin opposite the<BR>> > counter-balance. Should this be cleaned off, and if so, what’s the<BR>> > best way to go about it? I’ve switched bearings before and there is<BR>> > always some rust, but this seems to be more than I’d expect.<BR>> ><BR>> ><BR>> ><BR>> > Thanks,<BR>> ><BR>> ><BR>> ><BR>> > Timothy Pascoe<BR>> ><BR>> ><BR>> ><BR>> > _______________________________________________<BR>> > NSRCA-discussion mailing list<BR>> > NSRCA-discussion@lists.nsrca.org<BR>> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR>><BR>> _______________________________________________<BR>> NSRCA-discussion mailing list<BR>> NSRCA-discussion@lists.nsrca.org<BR>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR>><BR>> _______________________________________________<BR>> NSRCA-discussion mailing list<BR>> NSRCA-discussion@lists.nsrca.org<BR>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR><BR>_______________________________________________<BR>NSRCA-discussion mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR></P></div></body></html>