Engine Had a Miss on cylinders 1&5. Injector 1 had a broken return spring. Cylinder 5 had not improved with a injector swap. A relative compression test Showed cylinder 5 having no compression at all. Suspecting a valve or piston issue. Found two bent valves on cylinder 5. Pistons on 5 and 6 were both missing a inch of material. With other pistons starting to come apart. All the cylinder liners had no scoring. Despite the amount of material missing from rear cylinders. Customer had Bought a ex fleet truck. That always felt under-powered. Truck had even been derated in horsepower from factory engine tag. Turbo vanes from outside apeared undamged from debris. But, with housing removed the vanes were damaged further in. It is suspected The engine had a previous failure and was quick put back together for resale. The current owner uses truck on farm so it did not get the amount of runtime. A normal OTR truck would. Thus delaying failure. Engine oil prime and start up at 28:30.

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