Water Pump Guide Plate Gasket – Fits Tohatsu/Nissan/Mercury 2.5-3.5HP (Replaces 3F0-65029-0)
Water Pump Guide Plate Gasket – Fits Tohatsu/Nissan/Mercury 2.5-3.5HP (Replaces 3F0-65029-0) is backordered and will ship as soon as it is back in stock.
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Water Pump Guide Plate Gasket – Fits Tohatsu/Nissan/Mercury 2.5-3.5...
Product Details
This Water Pump Guide Plate Gasket – Fits Tohatsu/Nissan/Mercury 2.5-3.5HP (Replaces 3F0-65029-0) provides a reliable seal for the water pump assembly on a range of Tohatsu, Nissan, and Mercury 2.5-3.5HP 4-stroke outboard engines manufactured between 2003 and 2014. It is designed to meet or exceed original equipment specifications, ensuring proper cooling system function.
It serves as a direct replacement for Tohatsu part numbers 3F0-65029-0 and 3F0650290M, and Mercury parts 27-161603 and 898101332.
- Engineered for direct-replacement installation.
- Installs under the water pump guide plate to prevent leaks.
- Maintains cooling system integrity and performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Tohatsu / Nissan | 3F0-65029-0 | Also listed as 3F0650290M |
| Mercury / Mariner | 27-161603 | Also listed as 898101332 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket fits a wide range of small 4-stroke outboards from Tohatsu and Nissan between 2003 and 2014.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Tohatsu | MFS2.5B | 2.5 | 4-Stroke | 2009–2014 | 3F0-65029-0 | Also listed as 3F0650290M |
| Tohatsu | MFS3.5B | 3.5 | 4-Stroke | 2009–2014 | 3F0-65029-0 | Also listed as 3F0650290M |
| Tohatsu | MFS2.5A | 2.5 | 4-Stroke | 2006 | 3F0-65029-0 | Also listed as 3F0650290M |
| Tohatsu | MFS2A | 2 | 4-Stroke | 2006 | 3F0-65029-0 | Also listed as 3F0650290M |
| Tohatsu | MFS3.5A | 3.5 | 4-Stroke | 2006 | 3F0-65029-0 | Also listed as 3F0650290M |
| Tohatsu | M2.5A2 | 2.5 | 4-Stroke | 2003 | 3F0-65029-0 | Also listed as 3F0650290M |
| Tohatsu | M3.5A2 | 3.5 | 4-Stroke | 2003 | 3F0-65029-0 | Also listed as 3F0650290M |
| Tohatsu | M3.5B2 | 3.5 | 4-Stroke | 2003 | 3F0-65029-0 | Also listed as 3F0650290M |
| Nissan | NSF2.5B | 2.5 | 4-Stroke | 2009–2014 | 3F0-65029-0 | Also listed as 3F0650290M |
| Nissan | NSF3.5B | 3.5 | 4-Stroke | 2009–2014 | 3F0-65029-0 | Also listed as 3F0650290M |
| Nissan | NSF2.5A | 2.5 | 4-Stroke | 2006 | 3F0-65029-0 | Also listed as 3F0650290M |
| Nissan | NSF2A | 2 | 4-Stroke | 2006 | 3F0-65029-0 | Also listed as 3F0650290M |
| Nissan | NSF3.5A | 3.5 | 4-Stroke | 2006 | 3F0-65029-0 | Also listed as 3F0650290M |
| Nissan | NS2.5A2 | 2.5 | 4-Stroke | 2003 | 3F0-65029-0 | Also listed as 3F0650290M |
| Nissan | NS3.5A2 | 3.5 | 4-Stroke | 2003 | 3F0-65029-0 | Also listed as 3F0650290M |
| Nissan | NS3.5B2 | 3.5 | 4-Stroke | 2003 | 3F0-65029-0 | Also listed as 3F0650290M |
Also compatible with certain Mercury and Mariner models that use Tohatsu-built powerheads.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 2.5HP | 2.5 | 4-Stroke | 2003–2014 | 27-161603 | Also listed as 898101332 |
| Mercury | 3.5HP | 3.5 | 4-Stroke | 2003–2014 | 27-161603 | Also listed as 898101332 |
Technical Specs
- Product Type
- Water Pump Guide Plate Gasket
- Installation
- Direct Replacement
- Housing Material
- Gasket Material
- Dimensions
- 13.0 in L x 9.0 in W x 0.1 in H
- Weight
- 100g (0.22 lb)
- Other Technical Attributes
- Installs under the pump guide plate
What’s in the Box
- 1 x Gasket Guide Plate (Replaces 3F0-65029-0/3F0650290M)
Installation Notes
- Disconnect the spark plug wire and ensure the engine is in neutral.
- Remove the lower unit from the outboard motor.
- Unbolt and remove the water pump housing and impeller.
- Carefully lift off the water pump guide plate to access the old gasket.
- Scrape away all residue from the old gasket on both the guide plate and the lower unit surface. Clean both surfaces with a suitable solvent.
- Place the new gasket into position on the lower unit.
- Reinstall the guide plate, ensuring it is correctly aligned.
- Reassemble the water pump housing, impeller, and lower unit, torquing all bolts to the manufacturer’s specifications.
Troubleshooting & FAQ
How do I know if this gasket will fit my engine?
This gasket is designed for specific Tohatsu, Nissan, and Mercury 2.5HP and 3.5HP 4-stroke models from 2003–2014. The best way to confirm fitment is to match your engine's model and year to our compatibility tables and verify the OEM part number against the one you are replacing.
What are the signs of a failed guide plate gasket?
A failing gasket can cause a water leak from the lower unit, leading to engine overheating, a weak water stream from the "telltale" outlet, or reduced cooling efficiency. If you notice these symptoms, inspect the water pump assembly for leaks or damage.
Is this the only part I need to replace when servicing my water pump?
While this gasket is a critical component, a complete water pump service typically involves replacing the impeller, housing liner, and all related gaskets and seals. We recommend purchasing a full water pump repair kit for a comprehensive service.
Why are there multiple part numbers (e.g., 3F0-65029-0 vs. 3F0650290M)?
Manufacturers often update their part numbering systems or use different codes for the same part sold in different regions or packages. The numbers listed in our Part Number Matrix (e.g., 3F0-65029-0, 3F0650290M, 27-161603, 898101332) are all confirmed to be interchangeable for this specific gasket.
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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