Tohatsu Gear Case O-Ring 345-65015-0 Mercury 25-16131 Fits 5hp 8hp 9.8hp 9.9hp
345-65015-0
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Tohatsu O-Ring 345-65015-0
Premium Quality Lower Unit Seal
Maintain the integrity of your outboard's lower unit with this high-performance gear case O-ring. Specifically engineered for the Tohatsu engine families listed in the Compatibility section, this part provides a critical seal for the propeller shaft housing, preventing water from contaminating your gear lubricant and protecting internal gears from corrosion and wear.
Key Features
- ✔ Direct fit for the gear cases of the engine families listed in the Compatibility section
- ✔ High-grade Silicone (SI) construction
- ✔ Precision thickness for optimal compression
- ✔ Resistant to marine fuels and oils
Technical Specs
| Material: | Silicone (SI) |
| Application: | Propeller Shaft Housing |
Compatibility / Fitment Guide
| Model | Power | Engine type |
|---|---|---|
| Tohatsu M3.5 | 3.5 HP | 2-stroke |
| Tohatsu M4 | 4 HP | 2-stroke |
| Tohatsu M40 | 40 HP | 2-stroke |
| Tohatsu 5 HP / 8 HP / 9.8 HP / 9.9 HP models | 5 / 8 / 9.8 / 9.9 HP | — |
How to check before ordering: the part number on your old part should be 345-65015-0 (or a superseding number). If you are not sure, send us your engine model and serial number (on the plate on the engine bracket) and we will confirm fitment before you order. Tohatsu often uses the same part on related models, so this list may not be complete.
OEM Cross Reference
| Tohatsu / Nissan: | 345-65015-0, 345650150M, 345-65015 |
| Mercury / Quicksilver: | 25-16131, 16131 |
| Other Cross-Refs: | 5040061, F8-04040002 |
Questions & Answers
Is this a genuine original part?
This is a premium quality aftermarket replacement part, manufactured to meet or exceed original equipment (OE) standards for fitment and performance.
How do I know if it is compatible?
We recommend checking the SKU/MPN and Cross Reference list provided above. If your original part number matches any of these, it is a guaranteed fit.
Where is this O-ring located on the engine?
This O-ring is typically located in the gear case assembly, specifically sealing the propeller shaft housing (bearing carrier) to prevent water ingress into the lower unit gear oil.
Note: Please verify your original part number against the references above before purchasing. Part 345-65015-0 is listed in the official Tohatsu parts diagrams for the engine families in the Compatibility section. 4boats.co.uk
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
