Key Features

• Genuine OEM replacement – Briggs & Stratton Crankcase Oil Seal, part number 399781S, ensures exact fit and dependable sealing performance.
• Precision seal lip design – Maintains a tight barrier around the crankshaft to prevent oil from escaping the crankcase.
• Durable elastomeric construction – Withstands heat, engine vibration, and exposure to oil and combustion by-products for reliable service life.
• Easy installation – Designed for straightforward replacement during routine maintenance or engine overhaul.
• OEM reference clarity – Part Reference 399781S helps ensure correct identification and ordering.

Product Details

• Product Type: Crankcase Oil Seal
• Part Reference: 399781S
• Material: High-quality elastomeric sealing compound designed for oil resistance and long-term durability
• OEM Specification: Manufactured to Briggs & Stratton original specifications for accurate fit
• Function: Prevents oil leakage around crankshaft exits from the crankcase, preserving lubrication and reducing contamination risk
• Installation Context: Suitable for routine servicing or engine overhaul on compatible Briggs & Stratton engines

Compatibility

• Engine compatibility: Specified for use with selected Briggs & Stratton petrol engines that require the 399781S oil seal
• Typical applications: Briggs & Stratton small to medium petrol engines used in lawn mowers and garden machinery
• Equipment examples: Lawn mowers with compatible Briggs & Stratton engines; petrol-powered garden gear such as compact tillers, cultivators, pressure washers, generators, and similar tools
• Fitment tip: Oil seal compatibility depends on the engine model and crankcase/crankshaft interface – always verify against the engine’s model/tag or by comparing the current seal before ordering