[MCR]

Originally Posted by quattroa4

what you are saying MCR is good , but in forging you can not place parting line on the camshaft in diametrical axis .
as it is a longitudanal part , the parting line will come along the length ( axially) only.

Yes. The parting line will be along the axis of the shaft. Only then the grain will flow axially and the shaft can withstand the load.

@scuderiamania, I saw the pictures. The damage is because of shock load on the cam shaft. The damage makes this very evident.

[scuderiamania]

Can you please explain what shock load is?

[nitrous]

I've only seen rockers being broken supposedly because of the camshaft.

[SS-Traveller]

Originally Posted by scuderiamania

I saw both cams were broken. One was broken at two points and the other at one point.

Er... Is the Swift DDiS a twin-cam engine?

Edit: So it is!

[quattroa4]

as said by MCR its case of shear failure due to sudden impact load , migth be due to the valve itself . very possible . only thing is , should analyse the bearing which the pic is not showing . misalingment of the bearing with either its seat or camshaft must be checked.