I wanted to follow up and let you know that the data Blackstone provided was exceptionally accurate and ultimately correlated very closely with the components we found failing during teardown.
To close the loop between the oil-analysis results and the actual mechanical findings, I wanted to provide a more detailed summary of our diagnosis.
Shortly after departing our yard, the driver reported that engine oil pressure dropped to approximately 5 PSI, accompanied by a substantial loss of engine power and essentially no throttle response. He shut the engine down and contacted me immediately. During a video call, I had him restart the engine briefly so I could better evaluate the condition. Upon restart, he observed a significant amount of white exhaust smoke. At that point, I had the truck shut down and recovered by tow to prevent any additional damage. Once we began teardown, we identified several significant findings:
Turbocharger failure:
The turbocharger shaft exhibited substantial radial/axial play, and the oil-side sealing system had deteriorated to the point that oil was passing through the turbocharger. This was consistent with the heavy exhaust smoke and significant loss of engine performance observed during the failure. Based on the overall condition of the lubrication system, the severe low-oil-pressure event was also a likely contributing factor to the turbocharger damage.
Oil pump condition:
The oil pump had been replaced at several PM intervals earlier, near the same time as the rod and main bearing work referenced in my previous oil report. The replacement unit was a remanufactured Cummins oil pump.
During teardown, we found physical wear inside the pump where the bypass/regulating spring had been contacting the aluminum pump housing. I have attached photographs documenting this condition. Given the reported oil-pressure loss and the wear observed internally, the pump and its pressure-regulating/bypass components became a significant area of concern in determining the source of the lubrication failure.
Main gear bearing wear:
We also identified bearing wear severe enough to expose the brass layer on one of the main gear bearings. Considering the other lubrication-related findings, this damage is consistent with the bearing operating under inadequate oil-film conditions at some point. The combined evidence strongly suggests that intermittent or insufficient lubrication played a major role in the progressive wear we found.
What is particularly interesting is how closely the laboratory analysis was tracked with the mechanical failure.
Your report specifically identified elevated lead and iron, raised concern about abnormal wear occurring at a shaft/bearing interface, and recommended resampling approximately 10,000 miles. From the odometer reading at the previous sample to the mileage at failure, the truck accumulated 10,781 miles.
In other words, the failure occurred only 781 miles beyond the recommended resampling interval.
We came extremely close to catching this failure through oil analysis before it progressed to the point of a mechanical breakdown.
I appreciate the level of detail you provide in your reports, particularly the interpretation of the wear metals rather than simply reporting the numerical values. In this case, being able to compare the elevated lead and iron against the physical condition of the turbocharger, oil pump, and bearings during teardown provided a very useful real-world correlation between the laboratory data and the mechanical condition of the engine.
