Is straightening nitrided crankshafts recommended?

Nitrided crankshafts undergo a surface hardening process that enhances their durability and resistance to wear. However, the process of straightening these crankshafts can compromise this hardening treatment. When a nitrided crankshaft is straightened, the heat generated during the bending or straightening process can alter the properties of the nitrided surface, leading to a potential reduction in its fatigue strength and overall performance.

Additionally, the design and metallurgy of nitrided crankshafts often make them less tolerant to deformation compared to those that have not undergone nitriding. Because of these concerns, the standard practice is to avoid straightening these components altogether. The integrity and safety of the crankshaft are paramount, and any damage to the nitrided surface can lead to critical failures when the engine is in operation. For these reasons, it is generally advised not to straighten nitrided crankshafts.