Lower Case Packing Gasket – Fits Yamaha 6HP & 8HP 2-Stroke (Replaces 6G1-45315-A0-00)
Lower Case Packing Gasket – Fits Yamaha 6HP & 8HP 2-Stroke (Replaces 6G1-45315-A0-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Lower Case Packing Gasket – Fits Yamaha 6HP & 8HP 2-Stroke (Rep...
Product Details
This Lower Case Packing Gasket creates a secure seal for the lower unit on various Yamaha 6HP and 8HP 2-stroke outboards from 1984–2009. It is engineered to prevent water intrusion and oil leaks from the gearcase, ensuring reliable performance.
It serves as a direct replacement for Yamaha part numbers 6G1-45315-A0-00 and 6G1-45315-00-00, and is an interchange for Oversee Marine 6G1-45315-A0-00.
- Seals the lower unit gearcase assembly.
- Designed for installation on the lower unit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 6G1-45315-00-00 | 6G1-45315-A0-00 |
| Yamaha | 6G1-45315-A0-00 | |
| Oversee Marine | 6G1-45315-A0-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha models, check your engine's model code (e.g., 6C, 8MLH) and year suffix to ensure a match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 6C (6H6) | 6 | 2-Stroke | 1984–1993 | 6G1-45315-A0-00 | |
| Yamaha | 6D (6H8) | 6 | 2-Stroke | 1984–1989 | 6G1-45315-A0-00 | |
| Yamaha | 6L series | 6 | 2-Stroke | 1986–1990 | 6G1-45315-A0-00 | Includes 6LF, 6LG, 6LH, 6LJ models |
| Yamaha | 6S series | 6 | 2-Stroke | 1986–1990 | 6G1-45315-A0-00 | Includes 6SF, 6SG, 6SH, 6SJ models |
| Yamaha | 6MLH models | 6 | 2-Stroke | 1991–2000 | 6G1-45315-A0-00 | Includes P, Q, R, S, T, U, V, W, X, Y suffixes |
| Yamaha | 6MSH models | 6 | 2-Stroke | 1991–2001 | 6G1-45315-A0-00 | Includes P, Q, R, S, T, U, V, W, X, Y, Z suffixes |
| Yamaha | 6MSH models | 6 | 2-Stroke | 2002–2009 | 6G1-45315-A0-00 | Models A, B, C, D with various suffixes |
| Yamaha | 8C (6G1/6G10) | 8 | 2-Stroke | 1984–1993 | 6G1-45315-A0-00 | |
| Yamaha | 8J (6G1) | 8 | 2-Stroke | 1986 | 6G1-45315-A0-00 | |
| Yamaha | 8N (6G1) | 8 | 2-Stroke | 1984 | 6G1-45315-A0-00 | |
| Yamaha | 8L series | 8 | 2-Stroke | 1985–1990 | 6G1-45315-A0-00 | Includes 8LF, 8LG, 8LH, 8LJ, 8LK, 8LN models |
| Yamaha | 8S series | 8 | 2-Stroke | 1984–1990 | 6G1-45315-A0-00 | Includes 8SF, 8SG, 8SH, 8SJ, 8SK, 8SN models |
| Yamaha | 8MLH models | 8 | 2-Stroke | 1991–2000 | 6G1-45315-A0-00 | Includes P, Q, R, S, T, U, V, W, X, Y suffixes |
| Yamaha | 8MSH models | 8 | 2-Stroke | 1991–2001 | 6G1-45315-A0-00 | Includes P, Q, R, S, T, U, V, W, X, Y, Z suffixes |
| Yamaha | 8MSH models | 8 | 2-Stroke | 2002-2009 | 6G1-45315-A0-00 | Models A, B, C, D with various suffixes |
Technical Specs
- Product Type
- Lower Case Packing Gasket
- Installation
- Lower Unit / Gearcase
- Dimensions
- Height: 7.25 in; Width: 6.0 in; Length: 0.63 in
- Other Technical Attributes
- Used to seal the lower case of the outboard
What’s in the Box
- 1 x Packing, Lower Case (6G1-45315-A0-00)
Installation Notes
- Disconnect the spark plug leads and shift the outboard into neutral.
- Place a drain pan under the gearcase and remove the drain and vent screws to empty the gear oil.
- Remove the bolts securing the lower unit to the midsection.
- Carefully separate the lower unit from the engine. You may need to disconnect a speedometer tube or shift linkage.
- Remove the old packing gasket from the top of the gearcase. Thoroughly clean both mating surfaces, removing all old gasket material and corrosion.
- Place the new gasket into position, ensuring it is correctly aligned with all passages.
- Carefully guide the lower unit back into place, aligning the driveshaft, water tube, and shift shaft.
- Reinstall the mounting bolts and tighten them to the manufacturer's specified torque in the correct sequence.
- Install a new-in-package drain screw washer and refill the gearcase with the recommended marine gear lubricant.
Troubleshooting & FAQ
How do I know if this gasket fits my specific engine?
This gasket fits a range of Yamaha 6HP and 8HP 2-stroke models manufactured between 1984 and 2009. The most reliable method is to find your engine's model code and year, then compare it against the detailed compatibility table provided on this page.
What are the signs of a failing lower case gasket?
The most common sign of a bad gasket is water intrusion into the gearcase, which makes the gear oil appear milky or creamy. Other symptoms include visible oil leaks from the seam between the lower unit and the upper casing or a metallic sheen in the oil from bearing wear.
Can I reuse my old gasket if it looks okay?
No. This is a single-use compression gasket. It is designed to crush and create a seal one time. Reusing it will almost certainly lead to a leak, causing catastrophic gearcase failure. Always install a new gasket whenever the lower unit is serviced.
What's the difference between 6G1-45315-A0-00 and the older 6G1-45315-00-00?
The part number 6G1-45315-A0-00 is the official replacement (supersession) for the original 6G1-45315-00-00 part. They are functionally identical and fully interchangeable. This gasket replaces both versions.
Do I need to use gasket sealant or adhesive during installation?
Typically, this gasket is installed dry. The gasket material itself is designed to create the seal. However, it's always best practice to consult the official service manual for your specific Yamaha engine model, as procedures can vary slightly.
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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