Oil Seal – Fits Suzuki DT9.9/DT15 Outboards (Replaces 09283-25035)
Oil Seal – Fits Suzuki DT9.9/DT15 Outboards (Replaces 09283-25035) 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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Oil Seal – Fits Suzuki DT9.9/DT15 Outboards (Replaces 09283-25035)
Product Details
This high-quality Oil Seal – Fits Suzuki DT9.9/DT15 Outboards (Replaces 09283-25035) is specifically engineered for Suzuki 9.9–15 HP, 2-Stroke outboards from 1986–2004. Designed for the upper crankshaft position, it provides a reliable seal to prevent oil leaks and protect internal engine components.
This part serves as a direct interchange for Suzuki 09283-25035/09283-25035-000, Mercruiser 161622/26-161622, Bombardier 5040080, and Tohatsu 346-65013-0/346650130M.
- Installs in the upper crankshaft position.
- Made from durable Nitrile Rubber with a stainless steel garter spring.
- Features a TC (double lip) profile for superior sealing against oil and contaminants.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Suzuki | 09283-25035 |
| Suzuki | 09283-25035-000 |
| Mercruiser | 161622 |
| Mercruiser | 26-161622 |
| Bombardier | 5040080 |
| Tohatsu | 346-65013-0 |
| Tohatsu | 346650130M |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This oil seal is a confirmed fit for the following Suzuki 2-stroke outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Suzuki | DT9.9K, DT9.9K-G-Y | 9.9 | 2-Stroke | 1986–2000 | 09283-25035 |
| Suzuki | DT9.9K1-K4 | 9.9 | 2-Stroke | 2001–2004 | 09283-25035 |
| Suzuki | DT15K, DT15K-G-Y | 15 | 2-Stroke | 1986–2000 | 09283-25035 |
| Suzuki | DT15K1-K4 | 15 | 2-Stroke | 2001–2004 | 09283-25035 |
| Suzuki | DT15C | 15 | 2-Stroke | 1989–1997 | 09283-25035 |
This part number also cross-references to several Tohatsu models. Ensure your model and original part number match before ordering.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Tohatsu | M15D2 | 15 | 2-Stroke | 346-65013-0 |
| Tohatsu | M18E2 | 18 | 2-Stroke | 346-65013-0 |
| Tohatsu | M25C3 | 25 | 2-Stroke | 346-65013-0 |
| Tohatsu | M30A4 | 30 | 2-Stroke | 346-65013-0 |
| Tohatsu | M9.9D | 9.9 | 2-Stroke | 346-65013-0 |
| Tohatsu | MFS20C | 20 | 4-Stroke | 346-65013-0 |
| Tohatsu | MFS18B2 | 18 | 4-Stroke | 346-65013-0 |
| Tohatsu | MFS15C-B2 | 15 | 4-Stroke | 346-65013-0 |
| Tohatsu | MFS3 | 3 | 4-Stroke | 346-65013-0 |
Technical Specs
- Product Type
- Crankshaft Oil Seal
- Installation
- Upper Crankshaft
- Housing Material
- Nitrile Rubber
- Seal Profile
- TC (Double Lip with Single Garter Spring)
- Spring Material
- Stainless Steel
- Dimensions
- 25 × 40 × 7 mm (Inner × Outer × Thickness)
- Operating Temperature
- -30°C to 100°C (-22°F to 212°F)
- Other Technical Attributes
- Double lip radial seal with single garter spring
What’s in the Box
- 1 x Oil Seal (Replaces 09283-25035)
Installation Notes
- Ensure the engine is off and cool, and disconnect the spark plug leads for safety.
- Access the upper crankshaft, which typically requires removing the flywheel and stator assembly. Refer to your service manual for model-specific instructions.
- Carefully extract the old seal using a dedicated seal puller or a flat-head screwdriver, being cautious not to score the crankshaft or the housing surface.
- Thoroughly clean the seal housing and the crankshaft surface, removing any old sealant, dirt, or corrosion.
- Apply a thin layer of clean 2-stroke oil or marine grease to the inner and outer surfaces of the new oil seal.
- Position the new seal squarely over the housing opening. Use a properly sized seal driver or a socket with a similar outer diameter to gently and evenly press the seal into place until it is flush.
- Reinstall the stator, flywheel, and any other components removed during disassembly. Torque all fasteners to the manufacturer's specifications.
- After reassembly, start the engine and inspect for any signs of oil leakage around the new seal.
Troubleshooting & FAQ
How do I know if my crankshaft oil seal is failing?
The most common sign is a visible oil leak around the crankshaft, often noticeable at the bottom of the powerhead or inside the engine cowling. Other symptoms can include a loss of crankcase compression, difficulty starting, or a rough idle.
What is a "TC profile" seal and why is it important?
A TC profile seal features a double-lip design. The primary inner lip, energized by a garter spring, contains the oil. The secondary outer lip prevents dust, water, and debris from entering, extending the life of the seal and protecting the engine.
Can this seal be used on the lower crankshaft?
No, this specific part is designed for the upper crankshaft position. Seals are engineered with specific dimensions and materials for their intended location, and using the wrong seal will lead to premature failure and leaks.
What causes an oil seal to fail?
Seals can fail due to age-related hardening of the rubber, damage during installation, excessive heat, or wear from a rough or corroded crankshaft surface. Using the correct seal and installing it properly is key to a long service life.
Does this fit models outside the listed 1986–2004 year range?
While this part may be compatible with other models or years, we can only guarantee fitment for those explicitly listed in the compatibility table. Always verify against your engine's OEM part number before ordering.
Is any special sealant required during installation?
No, additional sealant is typically not required. A light coat of oil or grease on the seal's surfaces is sufficient for lubrication during installation. The seal is designed to create a tight fit on its own.
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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