wondering what would have caused this

[Unilevers]

a 2350? i ask because i have 2 other trucks here with identical issues. Both have ruined the blocks beyond repair and now need complete engines. both blew out between 3/4.

i can see in the ones here that this did not happen overnight. these were fleet trucks and were drove hard and continued for 2 weeks after the complaints of pressurizing coolant were heard. i call it the cutting torch effect. Cummins couldnt figure out what went wrong so they brought the trucks to me. protrusion was 9-10 thou which is too low for abused engines. I also ran the history on these 2 engines and the head had been off twice already under warranty and this was round 3. Measured the headbolts around 3/4 and they were not within spec for length anymore.

all these issues added up to complete failure, and cost this guy 1 complete reman 2350 engine and a brand new block. Both of the duty cycles were in the 60% plus range aswell - so this guy had worse case scenario. these engines have the wrong gearing (3.90's) and drivers with not enough maintenance and too high of duty cycles. they will fail again soon.

on the plus side we bought a brand new block right from cummins with the liners in it. measured em and all are at 14-15 thou. they are learning.