Water Pump Base Gasket – Fits Yamaha Outboard 100-300HP (6E5-44315-A0-00)
Water Pump Base Gasket – Fits Yamaha Outboard 100-300HP (6E5-44315-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
Water Pump Base Gasket – Fits Yamaha Outboard 100-300HP (6E5-44315-...
Product Details
This high-quality Water Pump Base Gasket creates a precise seal between the water pump housing and the lower gear case plate. It is designed for a wide range of Yamaha 2-stroke outboards from 100 HP to 300 HP and 4-stroke models from F80 to F250, ensuring reliable cooling system performance.
This part is a direct replacement for Yamaha OEM part numbers 6E5-44315-A0-00 and its superseded version 6E5-44315-00-00, and also cross-references to Sierra Marine part 18-0244.
- Installs in the lower gear case, between the water pump housing and base plate.
- Engineered from durable composite gasket material for a lasting seal.
- Includes one essential base gasket for a complete water pump service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 6E5-44315-A0-00 | Current OEM Part Number |
| Yamaha | 6E5-44315-00-00 | Superseded by 6E5-44315-A0-00 |
| Sierra | 18-0244 | Aftermarket Cross-Reference |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fitment includes a wide variety of Yamaha 2-stroke and 4-stroke outboard engines.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yamaha | 100A | 100 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | E115A | 115 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | 115B/C | 115 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | 130B | 130 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | 150A/C/F/G | 150 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | 175B/D/F | 175 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | 200A/B/C | 200 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | ProV 200 | 200 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | 200F/G | 200 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | 225B/C/D/F | 225 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | 250A/B/G | 250 | 2-Stroke | 6E5-44315-A0-00 | |
| Yamaha | Z150P/Q | 150 | 2-Stroke | 6E5-44315-A0-00 | Z-Series |
| Yamaha | Z175G/H | 175 | 2-Stroke | 6E5-44315-A0-00 | Z-Series |
| Yamaha | Z200N/P | 200 | 2-Stroke | 6E5-44315-A0-00 | Z-Series |
| Yamaha | Z250D | 250 | 2-Stroke | 6E5-44315-A0-00 | Z-Series |
| Yamaha | Z300A | 300 | 2-Stroke | 6E5-44315-A0-00 | Z-Series |
| Yamaha | F80C | 80 | 4-Stroke | 6E5-44315-A0-00 | |
| Yamaha | F100B | 100 | 4-Stroke | 6E5-44315-A0-00 | |
| Yamaha | F115A/B | 115 | 4-Stroke | 6E5-44315-A0-00 | |
| Yamaha | F130A | 130 | 4-Stroke | 6E5-44315-A0-00 | |
| Yamaha | F150A/B/D/F | 150 | 4-Stroke | 6E5-44315-A0-00 | |
| Yamaha | F175A | 175 | 4-Stroke | 6E5-44315-A0-00 | |
| Yamaha | F200A/B/C/F/G | 200 | 4-Stroke | 6E5-44315-A0-00 | |
| Yamaha | F225A/B | 225 | 4-Stroke | 6E5-44315-A0-00 | |
| Yamaha | F250A | 250 | 4-Stroke | 6E5-44315-A0-00 |
Technical Specs
- Product Type
- Water Pump Base Gasket
- Installation
- Lower Gear Case (Between Pump Housing and Base)
- Material
- Gasket Material (Paper/Composite)
- Dimensions
- 6.0" x 7.13" x 0.13"
- Weight
- 0.01 oz (0.28 g)
- OEM Part Number
- 6E5-44315-A0-00
What’s in the Box
- 1 x Water Pump Base Gasket (equivalent to 6E5-44315-A0-00)
Installation Notes
- Disconnect the engine's battery and ensure the engine is off.
- Drain the gearcase lubricant from the lower unit.
- Remove the lower unit (gearcase) from the outboard's midsection.
- Carefully unbolt and lift the water pump housing to access the base gasket.
- Remove the old gasket and thoroughly clean both mating surfaces of any residue or corrosion.
- Place the new gasket into position, ensuring it is correctly aligned with all bolt holes and water passages.
- Reinstall the water pump housing, torquing bolts to manufacturer specifications.
- Re-attach the lower unit, refill with fresh gear lube, and reconnect the battery before testing.
Troubleshooting & FAQ
How do I confirm this gasket fits my specific Yamaha outboard?
The most reliable way is to match your engine's model number against our compatibility list. You can also verify by cross-referencing your existing gasket's part number with 6E5-44315-A0-00, 6E5-44315-00-00, or Sierra 18-0244. If unsure, consult your service manual.
What are the signs of a failed water pump base gasket?
Common symptoms include engine overheating at idle or low speeds, a weak or inconsistent "telltale" water stream, or visible water leaking from the seam between the water pump and the gearcase.
Do I need to use sealant or adhesive with this gasket?
This gasket is designed to be installed dry. Applying sealants can interfere with proper seating and may cause it to fail prematurely. Always ensure the mounting surfaces are perfectly clean and flat before installation.
How often should the water pump and its gaskets be replaced?
As a preventative maintenance item, most manufacturers recommend servicing the entire water pump assembly (including gaskets and impeller) every 100 operating hours or at least once per year, whichever comes first. This is especially critical for boats operated in saltwater or sandy conditions.
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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