ISB 300 Power loss / Turbo Failure

Cummins don't run strainers just fuel filters, residual heat in the turbo exhaust housing cokes the oil on the bushing/bearing. Only a pyrometer can tell you when the turbo is idling below 300F so as not to coke the oil around the turbo shaft. 5 minutes idle time should normally cool an engine enough to prevent this but coming to the top of a mountain pass or long hill requires more time. 2nd biggest reason for power loss is air to air hose leaks, loose clamps etc. which will be observed on your turbo boost guage. ISB Cummins also had issues with transfer pumps the little guy that supplies the main injection pump. C9 Cat dump the EGR, DPF and reprogram around the junk and the little Cat will become a cool running killer with improved mpg and power.