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Turning Crankpins
http://www.rypn.org/forums/viewtopic.php?f=1&t=41054
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Author:  DRS.GPBensman [ Fri Aug 25, 2017 10:53 am ]
Post subject:  Re: Turning Crankpins

Sorry, hit the wrong key.
The use of the CLIMAX portable lathe would allow turning the crank pin surface without removing the drivers from the locomotive. It's esy to set up, does a great job and can leave a good finish - minumum hand polishing to complete the job.
But still; replacement of the rod brass.

Best Regards;
Gary P. Bensman,
Diversified Rail Services LLC

Author:  dinwitty [ Fri Aug 25, 2017 11:05 am ]
Post subject:  Re: Turning Crankpins

I think you can grease them up, and cover them up, B&LE 643 has them covered up, don't leave them open in the weather. The grease may hold water away and from the air.
The issue may not be as bad as percieved, its a matter how far you want to go, you might not have pits but potential rough surfaces needing smoothing. Personally I like the idea of turning them giving them a clean bill of health.

Author:  Bobk [ Fri Aug 25, 2017 6:30 pm ]
Post subject:  Re: Turning Crankpins

Find a company that does in place machining for marine diesel engines. This industry has the capability and machinery to go inside these mammoth marine engines to turn crank journals in place.

Author:  Kelly Anderson [ Tue Aug 29, 2017 1:19 pm ]
Post subject:  Re: Turning Crankpins

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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