Guide Bushing, Water Pipe – Fits Mercury/Mercruiser/Parsun/Yamaha Outboards (Replaces 40-02000002, 663-44367-00)
Guide Bushing, Water Pipe – Fits Mercury/Mercruiser/Parsun/Yamaha Outboards (Replaces 40-02000002, 663-44367-00) 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).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Guide Bushing, Water Pipe – Fits Mercury/Mercruiser/Parsun/Yamaha O...
Product Details
This Guide Bushing, Water Pipe is designed to provide a secure seal and proper alignment for the water pipe within the cooling systems of various outboard engines. It is engineered for a precise fit on select Mercury/Mercruiser, Parsun, and Yamaha models, ensuring reliable performance and preventing water leaks within the engine assembly.
This component serves as a direct replacement for several OEM part numbers, including Mercury 40-02000002 and 81427M, Yamaha 663-44367-00-00, and Parsun PAT40-02000002.
- Installs as a direct replacement for the original bushing.
- Made from robust materials designed to withstand the harsh marine engine environment.
- Guides and seals the water pipe to maintain cooling system integrity.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 40-02000002 | |
| Mercury | 81427M | Water Tube Seal (Lower) |
| Yamaha | 663-44367-00-00 / 663-44367-00 | |
| Parsun | PAT40-02000002 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mercruiser, this part fits various models using the specified part numbers. Please verify your part number before ordering.
For Yamaha, this guide bushing is confirmed to fit F40, F50, and F60 4-Stroke models.
For Parsun, this part is compatible with F40, F50, and F60 outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Various models | Various | 40-02000002, 81427M | Water Tube Seal (Lower) | ||
| Yamaha | F40 | 40 | 4-Stroke | 663-44367-00-00 | Water Pipe Guide Bushing/Water Seal | |
| Yamaha | F50 | 50 | 4-Stroke | 663-44367-00-00 | Water Pipe Guide Bushing/Water Seal | |
| Yamaha | F60 | 60 | 4-Stroke | 663-44367-00-00 | Water Pipe Guide Bushing/Water Seal | |
| Parsun | F40 | 40 | 4-Stroke | PAT40-02000002 | Guide Bushing, Water Pipe | |
| Parsun | F50 | 50 | 4-Stroke | PAT40-02000002 | Guide Bushing, Water Pipe | |
| Parsun | F60 | 60 | 4-Stroke | PAT40-02000002 | Guide Bushing, Water Pipe |
Technical Specs
- Product Type
- Guide Bushing/Water Pipe Seal
- Installation
- Direct replacement
- Connection
- Water pipe system
- Housing Material
- Robust materials designed for marine engine environment
- Dimensions
- 12.5 x 5.0 x 3.0
- Fitting Type
- Water pipe/tube
- Other Technical Attributes
- Designed to guide and seal water pipes in engine cooling systems
What’s in the Box
- 1 x Guide Bushing, Water Pipe (40-02000002/PAT40-02000002/663-44367-00-00)
Installation Notes
- Disconnect the battery and ensure the engine is cool before beginning work.
- Access the lower unit and locate the water pipe connection where the bushing is installed. This may require removing the lower casing.
- Carefully remove the old, worn bushing, taking note of its orientation. Clean the housing area of any debris or corrosion.
- Apply a suitable marine lubricant to the new guide bushing to ease installation.
- Press the new bushing firmly into place until it is properly seated.
- Reinstall the water pipe and any other components that were removed.
- Reconnect the battery and test the engine cooling system for leaks at idle.
Troubleshooting & FAQ
How do I know if this bushing fits my specific Mercury model?
Because this part fits a wide variety of Mercury/Mercruiser models, the best way to confirm fitment is to match the OEM part number from your engine's service manual or existing part to 40-02000002 or 81427M.
What are the signs of a failed water pipe guide bushing?
Common symptoms include water leaks around the water pipe area, engine overheating due to loss of cooling system pressure, or visible cracking and degradation of the old bushing material during inspection.
How often should this guide bushing be replaced?
It's good practice to inspect the guide bushing whenever servicing the water pump or lower unit. We recommend replacing it as part of routine maintenance every few seasons or if you notice any signs of wear, hardening, or cracking to prevent future cooling system failures.
Is this part different from the original OEM bushing?
This is an aftermarket part designed to meet or exceed OEM specifications for fit, form, and function. It provides comparable performance and durability to the original component at a better value.
Do I need any special tools for installation?
Basic hand tools for accessing the lower unit are typically sufficient. A lubricant can help with installation, but no specialized tools are usually required. Always follow your engine's service manual for detailed procedures.
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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