Cylinder Head Hose (Port) – Fits Evinrude/Johnson Outboards (Replaces 0340976)
Cylinder Head Hose (Port) – Fits Evinrude/Johnson Outboards (Replaces 0340976) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Cylinder Head Hose (Port) – Fits Evinrude/Johnson Outboards (Replaces 0340976) is backordered and will ship as soon as it is back in stock.
Product Details
The Cylinder Head Hose (Port) – Fits Evinrude/Johnson Outboards (Replaces 0340976) is an essential OEM cooling system component designed for the port side of the cylinder head. It ensures proper coolant flow to prevent engine overheating in compatible Evinrude/Johnson outboard engine models.
This part is a direct replacement and interchange for OMC part numbers 0340976, 340976, 321723, and 766430.
- Installs on the port (left) side of the cylinder head.
- Bombardier factory original part ensures precise fit and function.
- Engineered as a crucial component of the outboard cooling system.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 0340976 / 340976 |
| OMC | 321723 |
| OMC | 766430 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Evinrude/Johnson Owners: Compatibility can vary widely by model and year. Always verify the required part number against your engine’s service manual before ordering.
| Brand | Model | Rated HP | OEM Part No. | Notes |
|---|---|---|---|---|
| Evinrude/Johnson | Multiple models | Varies | 0340976/340976 | Also referenced as 321723, 766430 |
Technical Specs
- Product Type
- Cylinder Head Cooling Hose
- Installation
- Port side (left)
- Housing Material
- Rubber/Silicone
- Housing Color
- Black
- Dimensions
- 1.0" L x 6.0" W x 7.5" H
- Fitting Type
- Engine-specific
- Warranty
- Manufacturer standard
- Other Technical Attributes
- Bombardier factory original part
What’s in the Box
- 1 x Cylinder Head Hose (Port) (0340976)
Installation Notes
- Ensure the engine is completely cool and disconnect the negative battery terminal for safety.
- Place a drain pan under the engine to catch any spilling coolant.
- Locate the existing port-side cylinder head hose and loosen its clamps.
- Carefully detach the old hose, noting its orientation.
- Clean the housing connection surfaces to ensure a tight seal.
- Fit the new hose and secure it firmly with the clamps.
- Reconnect the battery, refill the cooling system as needed, and run the engine briefly while checking for leaks.
Troubleshooting & FAQ
Which side of the engine does this hose fit?
This hose is specifically designed for the port (left) side of the cylinder head.
How do I confirm this hose fits my engine?
The most reliable method is to match the part number. This hose replaces OEM parts 0340976, 340976, 321723, and 766430. Check your engine's service manual or examine the existing part to confirm the required number.
What are the signs of a failing cylinder head hose?
Common signs include coolant leaks near the engine block, engine overheating alarms, and visible physical damage to the hose itself, such as cracks, bulges, or brittleness.
Is this a genuine OEM part?
This listing is for a Bombardier factory original part sold as an aftermarket replacement. It is built to OEM specifications with comparable materials and has undergone rigorous quality control.
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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