Chevy Silverado Diesel: Teardown of Early Failure

LM2 3.0L Duramax: 277HP, 460 lb-ft

The LM2 3.0L Duramax is often hailed for its reliability and economical performance, taking its designated purpose into account. Nonetheless, without the proper upkeep of an engine, it may not fare well. In this particular case, the LM2 failed to respond to acceleration attempts and the oil appeared to be in a poor condition; both strong indicators as to why the motor was running so inefficiently.

This turbodiesel inline-six was taken out of a 2020 Chevrolet Silverado 1500 that had clocked 146,000 miles. Once you factor in that the typical yearly mileage for this model is estimated to be around 12,000 miles, it’s easy to see that this was an exceptional case. Eric from I Do Cars was on a mission to perform an engine teardown to get to the root of the problem.

BAD 2020 Silverado 3.0 Duramax LM2 Engine Teardown INCREDIBLE DAMAGE!

Eric started off the teardown by taking apart the crank pulley and the water pump accessory to mount it on the engine stand. Following that, he encountered difficulty extracting the injectors as there was no help to be found online. Nevertheless, when they were eventually extracted, all six were in satisfactory condition.

The assembly of the valve was the following one in sequence. There were no indications of harm located in the components, implying that the root of the problem could be discovered within the dynamo. Nonetheless, Eric hypothesized that oil pressure was necessary for the valve timing assembly. He also drew attention to the value and inferiority of the oil pump found inside the unit.

Eric detached the timing chain from the camshafts, revealing wear on the journals. Although there was nothing alarming, he proceeded to take off the cylinder head. However it wasn’t a simple task as the large head bolts in this particular engine were very stubborn.

As predicted, a major issue was present in the engine block which could be observed from the battered piston tops that had caused a strong impact to the valves. To continue with the disassembly, the oil pan was taken away resulting in openness to the oil pump and the crankshaft. There was a notable degree of deterioration in the former, however it was still able to create pressure, while the latter seemed mainly intact. The pistons were impacted with severe harm , and one had been completely destroyed.

The cause of the engine failure was assumed to be due to oil starvation as nothing impeded the oil pump pickup. Had the levels of lubricating oil been high, some particles would have clogged up the intake. Consequently, we can point the blame at the proprietor for inadequate upkeep as opposed to a mechanical design flaw.

The LM2 has been discontinued, but the subsequent model, known as the LZ0, is already employed for Chevy Silverado, GMC Yukon, and Cadillac Escalade amongst other full-sized vehicles.

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