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Re[2]: Crankshaft Rear Plug for C/S Prop

 
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gerry.vandyk(at)eastlink.
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PostPosted: Sat Dec 05, 2015 2:00 pm    Post subject: Re[2]: Crankshaft Rear Plug for C/S Prop Reply with quote

Hello Horst

The yellow tag that came with the crankshaft is from EC Services in San Antonio. The rod and main journals have indeed been ground to undersize dimensions and been re-nitrided. It appears to have been reworked in accordance with all approved processes. Would you expect that I'd need to check for non-spec chrome plating as well?

Gerry


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gerry.vandyk(at)eastlink.
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PostPosted: Sat Dec 05, 2015 5:37 pm    Post subject: Re[2]: Crankshaft Rear Plug for C/S Prop Reply with quote

Thanks for the notes Horst, I'll check it out. You are quite right, the chroming process on chrome-moly alloys does lead to hydrogen embrittlement. I design oil/gas drilling tools for a living, any parts that need chrome get a baking process afterward to leach the hydrogen from the steel. This tag does call out the flange being tin plated and baked, I presume that's for corrosion protection, and the baking for hydrogen removal, assuming as well the tin plating has the same issue as chrome.

I'll check into the process for checking about prior chrome repairs.

Gerry

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