Description
Quicksilver 8M0058391 Gear Case Drain Screw Seal 3/8-16 Pack of 2
Help protect your gearcase during routine lower unit service with the Quicksilver 8M0058391 gear case drain screw seal. This 2-pack of rubber-coated stainless steel drain screw washers is designed for select Mercury outboards and MerCruiser sterndrives using 3/8-16 gear case drain/fill screw holes.
Key Features
- Genuine Quicksilver gear case drain screw seal for select Mercury marine applications
- Designed for 3/8-16 gear case drain/fill screw holes
- Rubber-coated stainless steel construction helps create a secure seal
- Helps reduce the risk of water intrusion into the gearcase after gear lube service
- Ideal to replace during gear lube changes, lower unit maintenance, and sterndrive service
- Convenient pack of 2 seals so you can keep a spare on hand
Fitment / Product Details
- Brand: Quicksilver
- Part Number: 8M0058391
- BU Part ID: Not provided
- Product Type: Gear Case Drain Screw Seal / Drain Screw Washer
- Application: Select Mercury and Mariner outboards and MerCruiser sterndrives with 3/8-16 gear case drain/fill screw holes
- Engine Types: Mercury outboards, Mariner outboards, and MerCruiser sterndrive gearcase applications where specified
- HP Range: Not provided; not horsepower-specific
- Serial Ranges: Not provided; verify by model, serial number, parts diagram, owner’s manual, or service manual
- Year Range: Not provided; verify by model, serial number, and gearcase drain/fill screw specification
- UPC: Not provided
- Country of Origin: Not provided
- Prop 65: Not provided
- Package Dimensions: Not provided
- Package Weight: Not provided
- Packaged Quantity: 2
- Material: Rubber-coated stainless steel
- Thread / Screw Application: 3/8-16 gear case drain/fill screw holes
- Supersedes / Replaces: Not provided
- Fitment Note: Confirm compatibility by part number, gearcase drain/fill screw size, engine or drive model, serial number, parts diagram, owner’s manual, or service manual before ordering.
What’s Included
- Two Quicksilver 8M0058391 gear case drain screw seals
Expanded Fitment
- Select Mercury outboards with 3/8-16 gear case drain/fill screw holes
- Select Mariner outboards with 3/8-16 gear case drain/fill screw holes
- MerCruiser sterndrives with 3/8-16 gear case drain/fill screw holes
- Gearcase and lower unit drain/fill screw sealing applications where part number 8M0058391 is specified
- Not universal; confirm the correct washer by parts diagram and service manual before ordering
Why You Should Buy
- Small but important maintenance part for gear lube service
- Helps maintain a proper seal at the gearcase drain/fill screw
- Helps prevent water intrusion that can damage internal gearcase components
- Useful to keep on hand for seasonal service, oil changes, and lower unit maintenance
- Quicksilver part designed for compatible Mercury, Mariner, and MerCruiser applications
Common Applications
- Gear lube drain screw washer replacement
- Lower unit gear oil service
- Mercury outboard gearcase maintenance
- Mariner outboard lower unit service
- MerCruiser sterndrive drain/fill screw sealing
- Routine marine maintenance before reinstalling the gearcase drain screw
FAQ
- What is Quicksilver 8M0058391 used for? It is used as a gear case drain screw seal or washer for compatible Mercury, Mariner, and MerCruiser gearcase drain/fill screw applications.
- How many seals are included? This listing includes a pack of 2 gear case drain screw seals.
- What screw size does this seal fit? It is used with 3/8-16 gear case drain/fill screw holes on compatible applications.
- Is this part horsepower-specific? No. This seal is not horsepower-specific. Match it by part number, drain/fill screw size, gearcase design, and service manual requirements.
- Should this seal be replaced during gear lube service? Replacing the seal during gear lube service is recommended when specified by the service procedure or when the existing washer is worn, damaged, missing, or compressed.
- What happens if the seal is missing or not seated correctly? Water may enter the gearcase, which can lead to serious gearcase damage.
- Does this fit all Mercury outboards? No. It fits select applications with the correct 3/8-16 gear case drain/fill screw holes. Verify fitment before ordering.
- How do I confirm fitment? Confirm by part number 8M0058391, gearcase drain/fill screw size, model, serial number, parts diagram, owner’s manual, or service manual.