B-series Cummins cylinders at 448k miles

[nthach]

The cylinders look fine to me, why did the head go? If the UOAs are fine and if oil pressure is within spec, I wouldn't do bearings or the oil pump. Who's supplying the head or will be an Cummins reman?

I don't know much about diesels - but those Cummins B/ISBs are good engines. Cummins had the recipe down for them.

 

[PeterPolyol]

Originally Posted By: SubieRubyRoo
Wonder what the difference is... you'd think that being end cylinders they would run a little cooler, and therefore maintain a little bit more piston clearance. Still, not bad for nearly half a million miles! Thanks for the pics!


Possible increased wear from being at a lower temperature. There was discussion on cool temps on cylinder liners increasing wear or something to that effect

 

[artificialist]

How well is air distributed among the cylinders? How about EGR? In some cases, some cylinders have less air than others and it results in an uneven fuel air mixture.

I know this is a far bigger problem on inline 6 gasoline engines, but I guess it could happen to a diesel.

 

[A_Harman]

Originally Posted By: artificialist
How well is air distributed among the cylinders? How about EGR? In some cases, some cylinders have less air than others and it results in an uneven fuel air mixture.

I know this is a far bigger problem on inline 6 gasoline engines, but I guess it could happen to a diesel.


No EGR on this engine model. The 6B has the intake plenum cast integrally with the head, and it does taper to a smaller volume back at cylinder 6, so I would expect maybe less air back there.

 

[FlyNavyP3]

Is your ISB back up and running now? What did you end up doing for a replacement cylinder head?