hadder wrote:
Our locomotive 29 developed rust on the crankpins while sitting outside in storage for 8 years. It has made several successful trips since then and the rust wasn't even detected until recently, when an overheated crown brass necessitated removal of the rods and led to a more thorough examination. The pins have been polished with sandpaper to clean up the rough edges, but the pits remain.
If she runs successfully as is, why do anything? #90 has run for decades with a pitted crankpin presumably dating from some out of service period on the Great Western. Turning them with a portable machine is a stop-gap meant to keep an engine on the road and settle down a troublesome crankpin that can't be made to run cool, or is continually throwing brass, at the cost of throwing accurate quarter and throw out the window. If all eight crankpins are pitted and must be repaired, a quartering machine is the only way to go.
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