deutz engine 912 1011 1012 and 1013 crankshaft , Iran

Comparison of DEUTZ OE stock crankshaft with Chinese products

The durability and quality of an original crankshaft from a Deutz AG DEUTZ engine compared to a new Chinese aftermarket unit differ significantly under engineering scrutiny. Original DEUTZ crankshafts are manufactured from high‑grade forged alloy steel with controlled microstructure, resulting in a tensile strength above 900 MPa and fatigue endurance limit often exceeding 500 MPa. Precision machining with tolerances within ±0.005 mm ensures optimal journal geometry and dynamic balance, reducing vibration and bearing loads. In contrast, many new Chinese crankshafts use cast or lower‑grade forged steels with less consistent metallurgical properties. This can yield tensile strengths of 700–850 MPa and reduced fatigue resistance, leading to earlier crack initiation under high cyclic loading typical of industrial applications.

Performance differences between stock DEUTZ and Chinese crankshafts become evident during prolonged operation. Original units undergo strict quality control including non‑destructive testing and dynamic balancing to 1 g·mm unbalance, ensuring smooth torque delivery and reduced bearing wear. The precise surface finish Ra 0.4 µm enhances oil film formation, lowering friction and extending service life. Conversely, many Chinese units show higher surface roughness Ra 0.8–1.2 µm and less stringent balancing, increasing oil consumption and bearing stress. Consequently, original DEUTZ crankshafts typically achieve longer mean time between failures MTBF and superior reliability in heavy‑duty diesel engines, making them a more robust choice for critical industrial use.