Water Pump Gasket – Fits Parsun 6HP–9.8HP 4-Stroke Outboards (Replaces PAF8-04000008)
Water Pump Gasket – Fits Parsun 6HP–9.8HP 4-Stroke Outboards (Replaces PAF8-04000008) 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 Gasket – Fits Parsun 6HP–9.8HP 4-Stroke Outboards (Repla...
Product Details
This Water Pump Gasket – Fits Parsun 6HP–9.8HP 4-Stroke Outboards (Replaces PAF8-04000008) is designed for all year models of Parsun 6HP, 8HP, and 9.8HP 4-stroke outboard engines. It is used on the water pump outer plate assembly, forming a critical seal within the cooling system.
It provides a direct interchange for several OEM part numbers, including Parsun PAF8-04000008, Tohatsu/Nissan 3B2-65018-0, Mercury 8M0072137/27-8M0072137, and Yamaha 16158015/161585.
- Installation Location: Sits between the water pump outer plate and the lower unit housing.
- Function: Creates a seal to prevent water leaks and maintain pressure in the water pump.
- Material: Constructed from a durable paper/composite material to withstand the marine environment.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Parsun | PAF8-04000008 | |
| Tohatsu/Nissan | 3B2-65018-0 | |
| Mercury | 8M0072137 | Superseded 27-8M0072137 |
| Yamaha | 16158015 | Superseded by 161585 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is confirmed to fit all year models of Parsun F6, F8, and F9.8 4-stroke outboards.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Parsun | F6 | 6 | 4-Stroke | All | PAF8-04000008 | F6BML, F6BMS variants |
| Parsun | F8 | 8 | 4-Stroke | All | PAF8-04000008 | F8BML, F8BMS variants |
| Parsun | F9.8 | 9.8 | 4-Stroke | All | PAF8-04000008 | F9.8BML, F9.8BMS variants |
| Mercury | F6 | 6 | 4-Stroke | 8M0072137 | Superseded 27-8M0072137 | |
| Mercury | F8 | 8 | 4-Stroke | 8M0072137 | Superseded 27-8M0072137 | |
| Mercury | F9.8 | 9.8 | 4-Stroke | 8M0072137 | Superseded 27-8M0072137 | |
| Tohatsu | MFS | 6 | 4-Stroke | 3B2-65018-0 | ||
| Tohatsu | MFS | 8 | 4-Stroke | 3B2-65018-0 | ||
| Tohatsu | MFS | 9.8 | 4-Stroke | 3B2-65018-0 |
Technical Specs
- Product Type
- Water Pump Gasket
- Installation
- Between water pump outer plate and lower unit
- Housing Material
- Paper/Composite Material
- Dimensions
- 16.0cm x 10.0cm x 0.1cm (L x W x H)
- Other Technical Attributes
- Part of the cooling system water pump assembly
What’s in the Box
- 1 x Water Pump Gasket (PAF8-04000008)
Installation Notes
- Disconnect the engine's battery and shift the outboard into neutral.
- Position a drain pan and remove the lower unit gearcase drain screw to empty the oil.
- Remove the bolts securing the lower unit (gearcase) to the engine's upper leg. Carefully separate the lower unit.
- Locate and unbolt the water pump housing to access the old outer plate gasket.
- Remove the old gasket and thoroughly clean both mating surfaces of any old gasket material or corrosion.
- Place the new gasket into position on the clean surface of the lower unit.
- Reinstall the water pump outer plate and housing, ensuring bolts are torqued to manufacturer specifications.
- Re-attach the lower unit to the engine, reinstall gearcase oil, and test the cooling system on the water.
Troubleshooting & FAQ
How do I know if my water pump gasket is failing?
Common signs include the engine overheating at idle or low speeds, a weak water stream from the "telltale" outlet, or visible water leaks around the lower unit housing. These symptoms indicate a loss of water pressure, which the gasket is designed to prevent.
Is this the only gasket needed for a water pump service?
No, this is specifically the gasket for the outer plate of the water pump. A complete water pump service or impeller replacement typically involves other gaskets and seals. We recommend consulting a service manual for a full list of parts for your specific engine.
What is the recommended replacement interval?
For optimal reliability, the entire water pump impeller and its associated gaskets should be inspected annually and replaced every 2-3 years or 200-300 hours of use, whichever comes first. This interval can be shorter in saltwater or high-sediment environments.
Will this fit my 2-stroke engine?
No, this specific gasket is designed exclusively for the 4-stroke Parsun, Tohatsu, and Mercury models listed in the compatibility table. It will not fit 2-stroke engines.
Can I reuse my old gasket?
It is strongly advised not to reuse water pump gaskets. They are single-use compression parts that lose their sealing ability once removed. Reusing an old gasket will likely result in leaks and cooling system failure.
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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