Upper Casing Gasket – Fits Yamaha 40HP Outboard Motors (Replaces 676-45114-A1-00)
Upper Casing Gasket – Fits Yamaha 40HP Outboard Motors (Replaces 676-45114-A1-00) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Upper Casing Gasket – Fits Yamaha 40HP Outboard Motors (Replaces 67...
Product Details
This high-quality Upper Casing Gasket is designed for a precise fit on Yamaha 2-Stroke 40HP series outboard motors, including C40, CV40, E40, and K40 models manufactured between 1990 and 2002.
It serves as a direct replacement for Yamaha OEM part numbers 676-45114-A1-00, 676-45114-A0-00, and 676-45114-03-00.
- Ensures a direct, leak-free installation.
- Crafted from durable, marine-grade materials for longevity.
- Engineered to meet or exceed original equipment specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Yamaha | 676-45114-03-00 | 676-45114-A0-00 | Oldest version |
| Yamaha | 676-45114-A0-00 | 676-45114-A1-00 | Superseded version |
| Yamaha | 676-45114-A1-00 | Current version |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is compatible with select Yamaha 40HP 2-Stroke engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 40J (6J40) | 40 | 2-Stroke | 1990 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | 40QE (6R6) | 40 | 2-Stroke | 1990–1992 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | CV40ED (6R60) | 40 | 2-Stroke | 1990 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | E40D (6J4) | 40 | 2-Stroke | 1990 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | 40J (6J4) | 40 | 2-Stroke | 1991–1995 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | C40MHQ (6R60) | 40 | 2-Stroke | 1992 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | E40M (6J40) | 40 | 2-Stroke | 1992 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | 40G (6R6) | 40 | 2-Stroke | 1993 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | 40JK (6H9) | 40 | 2-Stroke | 1993–1997 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | 40Q (6R6/6R60) | 40 | 2-Stroke | 1993–1997 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | E40J (6J4/6J40) | 40 | 2-Stroke | 1994 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | 40QE-2 (6R6) | 40 | 2-Stroke | 1995 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | 40QM (6R6) | 40 | 2-Stroke | 1996 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | 40QE2 (6R6) | 40 | 2-Stroke | 1997 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | K40J (6H9) | 40 | 2-Stroke | 1998–2000 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | K40JWHL (6H90) | 40 | 2-Stroke | 2001 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | K40JWHY (6H90) | 40 | 2-Stroke | 2001 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | K40JWY (6H90) | 40 | 2-Stroke | 2001 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | K40JWH (6H91) | 40 | 2-Stroke | 2002 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | K40JWHL (6H91) | 40 | 2-Stroke | 2002 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | ERQ (6R60) | - | 2-Stroke | 1992 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | CV40ELD | 40 | 2-Stroke | 1990 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | C40ELRP | 40 | 2-Stroke | 1991 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | C40ELRQ/C40MSHQ/C40PLRQ | 40 | 2-Stroke | 1992 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | C40ELRR/C40MSHR/C40PLRR | 40 | 2-Stroke | 1993 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | C40ELRS/C40MLHS/C40MSHS/C40PLRS | 40 | 2-Stroke | 1994 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | C40ELRT/C40MLHT/C40MSHT/C40PLRT | 40 | 2-Stroke | 1995 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | C40ELRU/C40MSHU/C40PLRU | 40 | 2-Stroke | 1996 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
| Yamaha | C40ELRV/C40ESHV/C40MSHV/C40PLRV | 40 | 2-Stroke | 1997 | 676-45114-A1-00 | Supersedes 676-45114-A0-00 |
Technical Specs
- Product Type
- Upper Casing Gasket
- Installation
- Direct Replacement
- Material
- High-Performance Composite
- Dimensions
- 13.0" x 8.0" x 0.25"
What’s in the Box
- 1 x Upper Casing Gasket (Replaces 676-45114-A1-00)
Installation Notes
- Ensure the engine is off and the battery is disconnected. Allow the engine to cool completely.
- Drain the lower unit gear lube to prevent spills during disassembly.
- Carefully remove the components necessary to access the upper casing. Keep track of all hardware.
- Remove the old gasket and thoroughly clean both mating surfaces. Ensure they are free of old gasket material, oil, and debris.
- Position the new gasket correctly. Do not use sealant unless explicitly required by your engine's service manual.
- Reassemble all components in the reverse order of removal, torquing bolts to the manufacturer's specifications.
- Refill the gear lube, reconnect the battery, and test the engine, carefully checking for any leaks.
Troubleshooting & FAQ
How do I confirm this gasket fits my specific Yamaha outboard?
Verify your engine's model and year against the comprehensive 'Engine & Model Compatibility' list on this page. Matching the OEM part number (676-45114-A1-00) is the most reliable way to ensure a correct fit.
What are common signs that my upper casing gasket is failing?
A faulty upper casing gasket can cause symptoms like water mixing with your gearcase oil (creating a milky appearance), visible oil or water leaks around the casing seam, or engine overheating due to compromised cooling passages.
Do I need to use a sealant or adhesive with this gasket?
This gasket is designed to create a seal on its own. In most cases, no additional sealant is needed. However, always consult your specific engine's service manual for factory recommendations, as some applications may vary.
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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