hey guys a long time ago I rebuilt an old, old, old wisconsin robin 1 cylinder flathead engine. I leanerd soo much, and it was a great expierence with my father. I want to part it out so maybe another father and son can find that one part they need. However, it has been abused. My uncle ran it dry, (no oil) and thats why I fixed it. Maneged to reuse all the major parts. However, there is coloration on the crank where the connecting rod attaches. Not where the rod attaches, but directly around it. What does this mean and is it worth trying to get rid of?

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sorry there is no coloration on the bearing surface, just the crank.

 

As in the radius and web of the crank? Basically the discoloration means it got hot. The bearing may have suffered most of the abuse but friction and heat still got to the crank.

That area will have a different hardness than the rest of the crank. It has been heat treated(tempered) making it harder but more brittle than the rest of the crank. If the crank is stressed that is the place it will fail first.

As to how serious it is? Depends on how bad it is discolored. The more heat it saw the darker and bluer the metal will become. The heat treating will also be deeper if it saw higher heat. Depending on where the discoloration is, and how deep, you could take metal off until there is no more discoloration. But if it is only a few thousands deep I probably wouldn't worry about it.

Without knowing much about that particular engine and how stressed the cranks in those engines are, I can't really tell you one way or the other. Jus pass on a little info for you to digest.

 

hey man thanks. any help is appreciated. its pretty dark....and I did run it without governor and manifold....

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also man if uploaded somepics could you help me out? I dont mean to waste your time or annoy you, so feel free to decline

 

Wide strip over a decent sized area or a thin strip? It is in an area that removing metal won't hurt the crank?

 

It would help to see a picture of the rod journal, rod bearing and crankshaft in the disassembled state.

 

Ive Seen this before, but not usually with good result.
Generally means It got SUPER HOT as already said, and this usually means Deformation. Metal ALWAYS moves in some direction when it gets hot. Molecules basically expand or shift when extremly hot, which can mean, twisting, stretching and yes even growth!! Weird, but I would find someone with a GOOD Micrometer, or bring it to a machine shop and have em run Flux test for fractures

 

i have seen it on new cranks. from heat treating the journals. could be factory. post up the pic of it.

 

Hey guys sorry about not being on top of this. I have been swamped with work and school. I will try and post some pics ASAP. Thanks guys.

 

If you have someone with a mic check it for out of round. Get the dia. specs and clearances for the motor. If it is round and close to specs have someone put it in a lathe and emery cloth it. Does it have a bearing or just running the rod on the journal?

 

You might tell if it is factory by looking at the picture on page 15 of the BROCHURE OF THE 6.0L POWER STROKE DIRECT INJECT DIESEL ENGINE 2003.25 "F" SERIES SUPER DUTY

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It shows a crank with heat treament bluing!