Sierra 18-4698 Lower Unit Drain Fill Washer Gasket

The Sierra 18-4698 is a drain and fill washer designed for use on lower unit drain and oil level screws for Yamaha outboard motors and Mercury/Mariner engines. This marine-grade washer provides a direct replacement for various OEM parts and ensures a leak-resistant seal for critical lower unit applications.

Key Features:

• Designed to meet OEM specifications
• Sold individually for convenient replacement
• Can be used with Sierra 18-2374 Magnetic Drain Screw
• Durable construction for reliable sealing performance

Replaces OEM Part Numbers:

• Mercury/Mariner: 27-81987, 27-81987M
• Yamaha: 90430-08020-00, 604-45342-00-00, 90430-08801-00, YSG-14090-90-8G
• Mallory: 9-60100

Important Installation Note: Apply clean oil to the screw threads and both gasket surfaces before installation. Tighten just until seated, then turn the screw an additional 45 degrees to achieve proper torque, or tighten to 7 ± 1 Nm (5.2 ± 0.7 lb-ft). Proper installation prevents oil leaks and water intrusion into the lower unit.