4x Yamaha Outboard Gear Case Oil Drain Washer Seals 6-300HP 90430-08020 Gasket
90430-08020a
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Yamaha Outboard Gear Case Seals (4-Pack)
Replaces OEM Part: 90430-08020 / 90430-08003
Maintenance of your outboard's lower unit is critical for longevity. These premium gearcase oil drain washers are designed to provide a 100% leak-proof seal for the drain and fill screws on Yamaha outboard engines. Manufactured from high-density specialized fiber material, they compress perfectly to prevent oil leaks and, more importantly, to stop saltwater from entering your gearbox.
Key Features
- β Direct fit for Yamaha Drain/Fill screws
- β High-density oil-resistant fiber
- β Essential for every gear oil change
- β Prevents costly lower unit failure
Technical Specs
| Inner Diameter: | 8.1mm |
| Outer Diameter: | 12.65mm |
| Thickness: | 1.5mm |
| Torque Spec: | 7 Β± 1 Nm |
Compatibility / Fitment Guide
| Make/System | Model/Application | Years |
|---|---|---|
| Yamaha Outboards | 2.5 HP to 350 HP (2 & 4-Stroke) | 1984 β Present |
| Mercury Marine | Yamaha-based 4-Stroke Models | All |
| Selva Marine | All Models utilizing 8mm Drain Plugs | All |
OEM Cross Reference
| Yamaha OEM: 90430-08020, 90430-08003, 90430-08021, 90430-08801 |
| Sierra Marine: 18-4698, 18-46981-9 |
| Mercury / Mariner: 27-81987, 27-81987M |
| Mallory Marine: 9-60100 |
Questions & Answers
Is this a genuine original part?
This is a premium quality aftermarket replacement part, manufactured by 4Boats / Aftermarket to meet or exceed original equipment (OE) standards for fitment and performance.
How do I know if it is compatible?
We recommend checking the SKU/MPN and Cross Reference list provided above. If your original part number matches any of these, it is a guaranteed fit for your gearcase screws.
Can I reuse these washers?
No. These are "crush" style fiber gaskets designed for single-use. Once they are compressed during installation, they should be replaced every time the gear oil is changed to ensure a reliable seal.
Note: Please verify your original part number against the references above before purchasing. Distributed by 4boats.co.uk.
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