Upper Casing Gasket – Fits Yamaha & Mercury 48-55 HP (697-45114-A0-00)
Upper Casing Gasket – Fits Yamaha & Mercury 48-55 HP (697-45114-A0-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Upper Casing Gasket – Fits Yamaha & Mercury 48-55 HP (697-45114...
Product Details
This Upper Casing Gasket – Fits Yamaha & Mercury 48-55 HP (697-45114-A0-00) is engineered for a precise fit on Yamaha 48-55 HP 2-stroke outboard engines manufactured between 1989 and 2000. It is also compatible with select Mercury 40-55 HP 2-stroke models in the W-series.
This part serves as a direct interchange for Yamaha 697-45114-00-00/697-45114-A0-00, Mercury/Mariner 27-98952M/82794M, GLM Marine 38031, and Sierra 18-99030 references.
- Provides a reliable seal for the oil pan, manifold, and upper casing.
- Designed for direct replacement, simplifying installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 697-45114-00-00 | 697-45114-A0-00 |
| Yamaha | 697-45114-A0-00 | |
| Mercury/Mariner | 27-98952M | |
| Mercury/Mariner | 82794M | |
| GLM Marine | 38031 | |
| Sierra | 18-99030 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, this part fits a range of 48 and 55 HP 2-stroke models from 1989 to 2000. Please check your specific model code (e.g., CV55ELF, E48MLHT).
For Mercury owners, this gasket is compatible with W-40 and 55/W-55 2-stroke models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | CV55ELF | 55 | 2-Stroke | 1989 | 697-45114-00-00 | Superseded by A0-00 |
| Yamaha | CV55ELD | 55 | 2-Stroke | 1990 | 697-45114-00-00 | Superseded by A0-00 |
| Yamaha | C55ELRP | 55 | 2-Stroke | 1991 | 697-45114-00-00 | Superseded by A0-00 |
| Yamaha | C55ELRQ | 55 | 2-Stroke | 1992 | 697-45114-A0-00 | |
| Yamaha | C55ELRR/C55TLRR | 55 | 2-Stroke | 1993 | 697-45114-A0-00 | |
| Yamaha | C55ELRS/C55TLRS | 55 | 2-Stroke | 1994 | 697-45114-A0-00 | |
| Yamaha | C55ELRT/C55ERT/C55TLRT/C55TRT | 55 | 2-Stroke | 1995 | 697-45114-A0-00 | |
| Yamaha | E48MLHT | 48 | 2-Stroke | 1995 | 697-45114-A0-00 | |
| Yamaha | E48MLHU | 48 | 2-Stroke | 1996 | 697-45114-A0-00 | |
| Yamaha | E48MLHV | 48 | 2-Stroke | 1997 | 697-45114-A0-00 | |
| Yamaha | E48MLHW | 48 | 2-Stroke | 1998 | 697-45114-A0-00 | |
| Yamaha | E48MLHX | 48 | 2-Stroke | 1999 | 697-45114-A0-00 | |
| Yamaha | E48MLHY | 48 | 2-Stroke | 2000 | 697-45114-A0-00 | |
| Yamaha | 55B (697) | 55 | 2-Stroke | 1990–1993 | 697-45114-A0-00 | International models |
| Mercury | W-40 | 40 | 2-Stroke | 27-98952M/82794M | ||
| Mercury | 55/W-55 | 55 | 2-Stroke | 27-98952M/82794M |
Technical Specs
- Product Type
- Upper Casing Gasket
- Installation
- Direct replacement
- Application
- Oil pan, manifold, upper casing seal
- Dimensions
- 31.0 cm x 21.0 cm x 0.2 cm (L x H x W)
- OEM Number
- Yamaha: 697-45114-A0-00
- Compatible With
- Yamaha E48CMH, 55BET/B/BE/BM, E55CMH; Mercury 55/W-55, W-40
- Country of Origin
- Japan
What’s in the Box
- 1 x Gasket, Upper Casing (697-45114-A0-00)
Installation Notes
- Ensure the engine is off and cool, and disconnect the battery as a safety precaution.
- Drain relevant engine fluids (e.g., oil) to prevent spills during disassembly.
- Carefully unbolt and remove the components covering the upper casing section.
- Remove the old, worn gasket. Thoroughly clean both mating surfaces to remove any old gasket material or residue.
- Align the new gasket correctly on the cleaned surface, ensuring all bolt holes match up.
- Reinstall the upper casing and associated components. Tighten all bolts in the sequence and to the torque values specified in your engine's service manual.
- Refill any drained fluids, reconnect the battery, and start the engine to check for any leaks around the newly sealed area.
Troubleshooting & FAQ
How do I know if this gasket will fit my engine?
This gasket fits specific Yamaha 48-55 HP (1989–2000) and Mercury 40-55 HP models. Always verify your engine's model and year against the compatibility chart and check the part number on your old gasket.
What are the signs of a failed upper casing gasket?
Common signs include visible oil or water leaks around the engine's upper casing, engine overheating, or a loss of performance. A visual inspection for cracks or degradation in the old gasket is also a key indicator.
Is any additional sealant required for installation?
While this is a direct-fit gasket, some service manuals recommend a thin layer of gasket sealant for an optimal seal. Always consult your engine's specific service manual for the most accurate procedure.
How often should this gasket be replaced?
Gaskets should be replaced whenever the component they seal is removed for service or if signs of leakage appear. They are not typically on a fixed replacement schedule but degrade over time with exposure to heat and oil.
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.
Payment & Security
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