[CrickiKaze]

I have been really lazy about posting this but I beileve this was from late last year early this year when I was replacing my lower oil pan and things went further south...

Not sure what actually caused this but I'm glad I was looking around. It's hard to see in the bottom image but there was a visible crack 180* from the missing section.

 

[Revhead Kev]

Yeah you can see the crack opposite the missing section in the top pic.
BTW, which sprocket is this ?

 

[CrickiKaze]

Crank

 

[Tritton]

I machined that down since I deleted the balance shaft.

Did you have the balance shaft and chain on at the time of finding this? Could be a seizing balance shaft?

 

[CrickiKaze]

No balance shaft, that's the main chain section with the crank, not the bs chain section.

I was going to do the same thing and machine that part of the gear off but had better things to do.

 

[AOSpec]

Well, that doesn’t look like fun at all...

 

[Tritton]

No balance shaft, that's the main chain section with the crank, not the bs chain section.

I was going to do the same thing and machine that part of the gear off but had better things to do.

I weighed the part on a scale before and after, it actually split the weight more than half.

 

[CrickiKaze]

I figured as much, it a lot of materiel.