The STIHL 11400203051 engine crankcase is a genuine OEM replacement part designed for specific STIHL chainsaw models. This essential component houses the crankshaft and other internal engine parts, providing structural integrity and proper sealing for efficient engine operation. Manufactured to STIHL's rigorous quality standards, it ensures a precise fit and reliable performance, crucial for maintaining the longevity and power of your chainsaw. Compatible with popular models like the MS 261, MS 271, and MS 291.