[NSRCA-discussion] Rust on OS1.60 Crank

[jeffghughes at comcast.net]

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. 



  
----- Original Message ----- 
From: "Ron Van Putte" <vanputte at cox.net> 
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org> 
Sent: Monday, November 16, 2009 3:36:35 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [NSRCA-discussion] Rust on OS1.60 Crank 

I would imagine that all crankshafts are heat treated.  No adverse   
effects of my use of Osmose on the crankshafts I've treated. 

Ron 

On Nov 16, 2009, at 2:30 PM, jeffghughes at comcast.net wrote: 

> Some crankshafts are heat treated, so I'd be carefull using any   
> acid based de-rusters. Probably won't hurt anything, but unintended   
> consequences can occur. 
> 
> 
> 
> ----- Original Message ----- 
> From: "Ron Van Putte" <vanputte at cox.net> 
> To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org> 
> Sent: Monday, November 16, 2009 1:18:11 PM GMT -05:00 US/Canada   
> Eastern 
> Subject: Re: [NSRCA-discussion] Rust on OS1.60 Crank 
> 
> I remove most of the rust from iron/steel items by using fine steel 
> wool and phosphoric acid (Osmose).  It causes a chemical reaction 
> with the rust (ferrous oxide) and converts it into an inert form 
> (ferrous sulphate). 
> 
> BTW Osmose works well on the whitish/bluish powder/crystals which 
> form on some electrical connections. 
> 
> Ron VP 
> 
> On Nov 16, 2009, at 12:01 PM, Pascoe,Tim [Burlington] wrote: 
> 
> > What’s the best way to clean rust off the crank of an engine, or is 
> > it even necessary? I have an OS 1.60 that has very low run time 
> > (less than 2 gallons), but had been sitting for a while. I pulled 
> > the bearings out as the main looked/felt as if it could use a 
> > change. At the same time, I noticed a fair amount of rust on the 
> > crank, specifically in front of the con-rod pin opposite the 
> > counter-balance. Should this be cleaned off, and if so, what’s the 
> > best way to go about it? I’ve switched bearings before and there is 
> > always some rust, but this seems to be more than I’d expect. 
> > 
> > 
> > 
> > Thanks, 
> > 
> > 
> > 
> > Timothy Pascoe 
> > 
> > 
> > 
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