Shot Peened Fillets on Cranks

[Burn Down]

So I pulled some bearings out of a Cat 3516HD engine at work today. I noticed something that I had previously hadn't thought much of until now. The Fillets are shot Peened... When I google the process I learned something interesting, a couple publications stated a 10-40% increase in "Fatigue" strength depending on crank material... Maybe something to help prevent breaking cranks?

Does anyone know of trying this on a D-max Crank or where to get it done?

Here is a pic of the Cat engine

 

[Jackblack99]

Ill ask my machinist. My stuff is at the machine shop now.

 

[durallymax]

Banks has done it on some cranks.

Guy is equipped to do it IIRC, not sure if he has done it on cranks and/or what results have been seen.

 

[Kappa9012]

its also used for stress relief, you'll find that when you pull the valve covers on C series Cat engines the decks under the valve covers are peened.

 

[dbev24]

My crank was shot penned. We will see how it holds up

 

[andy-stevenson]

My crank was shot penned. We will see how it holds up

How much did it cost to have done?

 

[Burn Down]

Next question is has anyone seen a shot peened crank broken?

 

[Dave c]

Some diesel shops do it allready, I know NGM does it and almost all gasser builders. Shot peening eliminates stress risers, where a crack can start to form. Polishing does the same thing, only provides a finer finish. This is nothing new, but seems that most diesel shops are way behind.

 

[Jackblack99]

My machine shop does it to the cranks they do and are doing it to mine.