Gear Housing Seal Kit – Fits Yamaha F75/F90 (2003-05), F80/F100 (1999-02) (Replaces 67F-W0001-20-00)
Gear Housing Seal Kit – Fits Yamaha F75/F90 (2003-05), F80/F100 (1999-02) (Replaces 67F-W0001-20-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This Gear Housing Seal Kit – Fits Yamaha F75/F90 (2003-05), F80/F100 (1999-02) provides a complete solution for servicing the lower unit on Yamaha F75/F90 (75-90 HP, 4-Stroke, 2003–2005) and F80/F100 (80-100 HP, 4-Stroke, 1999–2002) outboard engines. It contains all the necessary components to restore a water-tight seal and prevent gear lube contamination.
It serves as a direct replacement for Yamaha part numbers 67F-W0001-20-00 and 67F-W0001-21-00, and interchanges with Mallory Marine 9-74535, Sierra 18-74535, and RareElectrical 18-74535A1.
- Includes high-quality seals and gaskets for a complete lower unit reseal.
- Designed for installation as a direct OEM service part.
- Backed by a 1-year manufacturer warranty for peace of mind.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 67F-W0001-20-00 | 67F-W0001-21-00 |
| Yamaha | 67F-W0001-21-00 | |
| Mallory Marine | 9-74535 | |
| Sierra | 18-74535 | |
| RareElectrical | 18-74535A1 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is specifically for the following Yamaha outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F75 | 75 | 4-Stroke | 2003–2005 | 67F-W0001-20-00 | Superseded by 67F-W0001-21-00 |
| Yamaha | F90 | 90 | 4-Stroke | 2003–2005 | 67F-W0001-20-00 | Superseded by 67F-W0001-21-00 |
| Yamaha | F80A/B | 80 | 4-Stroke | 1999–2002 | 67F-W0001-20-00 | Superseded by 67F-W0001-21-00 |
| Yamaha | F100A/D | 100 | 4-Stroke | 1999–2002 | 67F-W0001-20-00 | Superseded by 67F-W0001-21-00 |
Technical Specs
- Product Type
- Lower Unit Gear Housing Seal Kit
- Installation
- OEM Service Part
- Dimensions
- Height: 4.0 in; Width: 14.0 in; Length: 13.0 in
- Weight
- 0.07 LBS (0.032 kg)
- Warranty
- 1 Year (RareElectrical)
- Other Technical Attributes
- Contains high-quality seals and gaskets needed for sealing the lower unit
What’s in the Box
- 1 x Gasket, Exhaust Manifold (9-60322)
- 1 x Gasket, Exhaust Manifold (9-60323)
- 1 x Gasket, Muffler (9-60340)
- 1 x Gasket, Oil Pan (9-60346)
- 1 x Gasket, Upper Casing (9-60359)
- 1 x Seal, Ext 1 (9-78212)
- 1 x Seal, Oil Strainer (9-78214)
Installation Notes
Professional installation is highly recommended. Always consult your engine's official service manual for detailed procedures, torque specifications, and required tools. Ensure all mating surfaces are thoroughly cleaned of old gasket material and debris before installing the new components to ensure a proper and lasting seal.
Troubleshooting & FAQ
How do I know if this seal kit fits my Yamaha engine?
This kit is designed for Yamaha F75/F90 (2003–2005) and F80/F100 (1999–2002) 4-stroke models. Please verify your exact model and year against the "Engine & Model Compatibility" table before ordering.
What are the signs that my gear housing seals are failing?
Common signs include milky or water-contaminated gear lube, visible oil leaks around the lower unit, or a noticeable drop in gearcase oil level. Prompt replacement is crucial to prevent catastrophic gear failure.
Is this a complete kit for the lower unit?
This kit contains the primary seals and gaskets for a standard lower unit re-seal service, as detailed in the "What's in the Box" section. However, depending on the condition of your unit, other individual parts like o-rings or bearings may also need replacement. Always consult your service manual.
How often should lower unit seals be replaced?
There is no fixed replacement interval. Seals are typically replaced when servicing the lower unit, when any signs of leakage appear, or as a preventative measure during a major overhaul or water pump service. Regular inspection of your gear lube is the best way to monitor seal condition.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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