Crankshaft "gouge"

[Airwreckc]

Hi all,

After a lot of searching, I found a 350 crank recently.  Upon initial inspection, it appeared to be pretty clean and apparently recently ground 10 thousands under.  I started to clean it up and begin a polishing process and then noticed a small gouge near one of the oil galleys.  I'm not sure if going to the next size under will eliminate it, so wondering if it's something that could normally be lived with.  Of course, I'll have the crank checked for cracks, but otherwise, what do people do with these sorts of things?  Too bad it's not on the mains, since those have a lot of grinding to be done...

[mgb260]

Looks like it needs to be welded up and then have rod journals turned down .020 under.

[BlownMGB-V8]

Since it isn't on the thrust side of the journal you can probably get by with just cleaning it up a little and having the crank ground. There may be a small chance it could pick up whatever dirt or grit might come through but for the most part it will just fill up with oil and not cause a problem. Generally speaking you want a smooth continuous surface but imperfections below that surface aren't going to touch the bearing.

Jim

[Airwreckc]

Jim and Jim,

Thanks for the feedback, as always.

[DiDueColpi]

Take it to a good machinist and get it properly ground and you'll be fine.
It looks like the previous grind ignored the fillets all together, which can lead to cracking.
Get the fillets rolled and then grind the crank. Go find sleeping beauty and live happily ever after.

Live like you mean it
Fred

[Airwreckc]

Fred, ha--I already have Sleeping Beauty

Thanks for pointing out the lack of fillets--missed that myself.

Eric