My Pete rebuild

[Nostalgic]

In other news. My 3rd crankshaft came in today.
Refresher
#1 had the broken tone wheel
#2 - Remember how I said runout had a high spot? I decided to check a little more.


Cummins lists max runout criteria for reusing a crank. I'm ready to bet that just about nobody ever checks. In fact I'm just about certain of it. This includes Cummins lol. Either that, or I have had excellent luck in finding all of the junk...

Front oil seal runout .004" MAX .002"
Rear oil seal runout .002" MAX .0012"
#4 Main Journal .010" MAX .008"

According to Cummins, that NEW crank needs to be replaced. Cummins wanted it inspected by a certified tech. Same conclusion.

Today's crankshaft:


Front oil seal runout .002"
Rear .0018"
#4 journal .0035"

Little iffy on the front and rear oil seals, but went ahead to check the rest of the main journals...

Plotting journal runouts:



Passes by the skin of it's teeth with a .003" max allowable adjacent journal runout between 5 & 6.



I have a feeling that a 4th crank wouldn't be any better, but figured if anyone has ever actually checked a crank, this is the place to find out if these numbers are acceptable.