Lower Casing Cap – Fits Yamaha 40HP 2-Stroke Outboard Motors (Replaces 676-45361-00-94)
Lower Casing Cap – Fits Yamaha 40HP 2-Stroke Outboard Motors (Replaces 676-45361-00-94) 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 is a direct replacement Lower Casing Cap – Fits Yamaha 40HP 2-Stroke Outboard Motors, specifically designed for E40G, E40GMH, and E40GWH models. It serves as a crucial component of the lower unit assembly, housing a key bearing to ensure smooth operation.
This part is a direct interchange for Yamaha OEM part numbers 676-45361-00-94, 676-45361-01-94, and 676-45361-01-CA.
- Engineered for direct replacement installation.
- Constructed from a durable metal alloy for longevity.
- Houses a bearing for the lower unit gear assembly.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 676-45361-00-94 | 676-45361-01-94, 676-45361-01-CA |
| Yamaha | 676-45361-01-94 | |
| Yamaha | 676-45361-01-CA |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, please verify your model is listed. While year ranges are unconfirmed, part number matching is the most reliable method for ensuring fitment.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yamaha | E40GMH | 40 | 2-Stroke | 676-45361-00-94 | Superseded by 676-45361-01-94, 676-45361-01-CA |
| Yamaha | E40GWH | 40 | 2-Stroke | 676-45361-00-94 | Superseded by 676-45361-01-94, 676-45361-01-CA |
Technical Specs
- Product Type
- Lower Casing Cap
- Installation
- Direct replacement
- Housing Material
- Metal alloy
- Dimensions
- 15.5 x 13.5 x 4.5
- Weight
- 0.17 kg (0.37 lb)
- Other Technical Attributes
- This cap houses a bearing for the lower unit assembly
What’s in the Box
If purchased as cap assembly:
- 1 x Cap, Lower Casing (676-45361-01-94)
- 1 x Bearing (93306-20401)
- 2 x Oil Seal (93101-20048)
- 1 x O-Ring (93210-57M00)
If purchased as cap only:
- 1 x Cap, Lower Casing (676-45361-00-94)
Installation Notes
The following are generic steps. Always consult a service manual for your specific engine model.
- Ensure the engine is off and disconnect the battery.
- Position a drain pan and remove the lower unit's gear oil drain and vent screws to empty the oil.
- Remove the propeller assembly.
- Unbolt and carefully detach the lower unit from the engine's upper section.
- Locate and remove the old lower casing cap. This may require specialized tools.
- Thoroughly clean the housing and inspect the bearing seat for wear or damage.
- If installing an assembly, confirm the new bearing and seals are correctly seated in the new cap.
- Install the new O-ring and then carefully fit the new lower casing cap, tightening bolts to the manufacturer's specified torque.
- Reassemble the lower unit and attach it back to the engine.
- Reinstall the propeller.
- Refill the lower unit with the correct grade and amount of marine gear oil.
- Start the engine and check for leaks and proper gear engagement.
Troubleshooting & FAQ
How do I know if this cap will fit my Yamaha outboard?
The most reliable way is to match your engine's model number (e.g., E40GMH) against the compatibility list. You can also cross-reference the part number stamped on your original cap with the numbers in our Part Number Matrix (676-45361-00-94, etc.).
What are the signs of a failing lower casing cap?
Common symptoms include gear oil leaking from the lower unit, water contamination in the gear oil (milky appearance), or excessive noise and vibration from the gearcase area, which could indicate a failed bearing housed by the cap.
Is this the complete assembly or just the cap itself?
This listing may be available as a full assembly or as the cap only. Please refer to the "What's in the Box" section to see exactly what is included with each option before purchasing.
Should I replace the seals and bearing when replacing the cap?
Yes, it is highly recommended. The seals and bearing are critical wear items. Replacing them along with the cap ensures a complete and lasting repair, preventing premature failure and future leaks.
What is the difference between part 676-45361-00-94 and 676-45361-01-94?
The part number 676-45361-00-94 is the original number that has been superseded by 676-45361-01-94 and 676-45361-01-CA. These newer versions are functionally identical and serve as direct replacements for the original.
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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