MTD Snowblower Oil Seal 921-0146

Basic information

• Part name: Snowblower oil seal
• Manufacturer: MTD
• Category: Snowblower seals and gaskets
• Primary function: Prevents oil from leaking out of a shaft opening while keeping contaminants out

Installation & compatibility

• Compatible models: Fits select MTD and Craftsman snowblowers; confirm compatibility using your models parts diagrams
• Installation difficulty: Medium; requires removing the old seal and pressing the new seal squarely into place
• Tools required: Seal driver or socket set, hammer

Additional information

This snowblower oil seal, part number 921-0146, fits around a rotating shaft where it exits a gearbox, housing, or bearing bore to keep lubricant inside and prevent dirt, water, and debris from entering. A properly seated oil seal helps maintain proper lubrication levels and reduces wear on internal components.

If the oil seal hardens, cracks, or wears, oil can leak out and contaminants can enter the seal area. You might notice oil on the housing, reduced lubricant levels, unusual noises, or premature wear on bearings or gears if the seal is compromised.

Disconnect the spark plug wire before starting the repair to prevent accidental startup. Seal edges and surrounding components can have sharp surfaces, so wearing work gloves can help protect your hands during installation. Make sure the new seal is inserted squarely and fully seated before using the snowblower.

Snowblower oil seal 921-0146 replaces part number 721-0146.