Compared to the indirect measurements of a conventional oil mist detector, direct continuous monitoring of the crankpin bearing temperature permits earlier detection of a bearing overheating. This prevents major failures of critical and highly costly engine components and protects against the direct consequences of the non-operational availability of the engine. It also avoids any extra costs related to unplanned expensive maintenance opertions. Tobe able to continuously detect and monitor the temperature of rotating bearings in an accurate and reliable manner, Wartsila has recently developed an innovative wireless temperature-sensing device.