1178 Crank Question

[Dusk_Blue_Z]

I have two 1178 cranks that haven't been ground. Brought them to a crankshaft shop and they magged both of them and found many small hairline cracks. Is that normal for these particular cranks? Thanks.

[69Z28-RS]

I would guess that the 'hairline cracks' are only in the surface of the journal, unless the machinist had a better idea... turning them 0.010 might totally take care of them?   

[bcmiller]

They found hairline cracks, but what else did the say or recommend?

[Dusk_Blue_Z]

They said I could have them ground but they won't warranty/guarantee that they would come out clean. I'll get one of them ground and see how it comes out.

I just found it odd that cracks were prevalent in both. Makes me think small hairline cracks are 'normal' for these cranks. Thanks for the replies.

[69z28302]

I would get a second opinion from a different shop and see what it say's

[Tx-Z 302]

I'm curious if it isn't heatchecks vs cracks, I would get a second opinions to the value of the cranks.

[69Z28-RS]

It could be a function of 'heat' and the tufftride surfaces put on those cranks;  I think cutting a few thousands will eliminate both...

[Stingr69]

50 years of 1178 cranks and you have TWO outliers?  Second opinion is warranted. 

[L78 steve]

Thump the flange end of crankshaft on a concrete floor. It will have a distinct sound if its cracked. Your crank shop should know this.

[bcmiller]

Find a different shop.

[Kelley W King]

I think I would look elsewhere also. I have had 2 sets of heads deemed worthless by two different people. Running both today.

[Arch Stanton]

Did he say they were junk, but still offered to take them off your hands?