Kyron219

Crankshaft have k nicks in it... That I can kind grab tip of finger nail on....any recommendations on how this would mess my engine up...Any quit fix tips on this also ????

OLDSter Ralph

Is the crank standard or ground undersized ? How did they get the knicks ? They need to be taken care of.

Kyron219

The crank has been machined .010 or .10 under and I made a very dumb rookie mistake of turning the crank with the connecting rod on but no lube😞😞😞😞😞

lemoldsnut

Probably should have a good machinist look at it.

redoldsman

I would follow lemonoldsnut's suggestion. Hopefully they can polish it and it will be okay.

Kyron219

I keep getting people also telling me 400 grit wet sand paper should knock down then polish... Is this a good method as I keep getting recommended this technique ???

RandyS

As suggested, have a good machinist take a look at it. Maybe the most important part of a happy motor.........

redoldsman

400 is a very fine grit and I don't think it would know down much of a burr but I don't think it would hurt. For what is at risk I would still take it to a machinist and get an expert opinion.

67OAI

If not too bad a nick, a good machinest can use a fine grit stone to nock down the protrusion and then polish it.

OLDSter Ralph

Is the nick on a main journal or on a rod journal ? How did the crank get a nick ? A nick is caused by impact of something hard or sharp. How did the bearings look ? You don't get nicks by rotating the engine without priming the oiling system. Was lube applied when assembling ?
My concern is........are there anymore nicks that haven't been discovered yet.
A very fine stone can knock down the nick, if done carefully.

BillK

This can work in a very localized spot BUT ....... if you dont know what you are doing you will only make it worse. It will have to be polished afterwards anyway so just take it to your machine shop and let them take care of it.

OLDSter Ralph

How the nick was discovered and how the nick got there has me curious. I am concerned that there might be other nicks that haven't been discovered yet.
A crankshaft trip to a good machine shop is seeming more likely.