Description

Yanmar X0506590-01, also listed as 05-06-590, is a genuine OEM sea water pump impeller O-ring used to seal the raw water pump cover on a wide range of Yanmar marine diesel engines. This sealing O-ring is a service replacement part for maintaining proper water pump sealing and helping prevent leaks at the pump cover.

Key Features

• Genuine Yanmar OEM part
• Sea water pump impeller O-ring
• Used to seal the raw water pump cover
• Helps maintain proper pump sealing and prevent water leakage
• Also listed as 05-06-590
• Service replacement for a wide range of Yanmar marine diesel engines

Engine Compatibility
Commonly listed for the following Yanmar marine diesel engine series and models:

• 3JH Series: 3JH2-TE, 3JH3E, 3JH3CE, 3JH4E, 3JH5E
• 4JH Series: 4JH3-E, 4JH3-TE, 4JH4-E, 4JH4AE, 4JH45, 4JH57, 4JH80, 4JH110
• 4LH Series: 4LH4-TE, 4LH4-HTE
• 6LP Series: 6LP(A)-DTE, 6LP(A)-STE, 6LPA-STP2, 6LPA-STZP

Fitment should still be confirmed by engine model and the installed raw water pump application before ordering.

Serial Number Fitment Notice
Fitment should be confirmed by engine model and serial number, along with the installed sea water pump configuration, before ordering. On Yanmar raw water pump parts, serial number confirmation is the safest way to avoid ordering the wrong seal.

When This Part Needs Replacement
Replace this O-ring when servicing the raw water pump impeller, or any time the existing seal is flattened, brittle, cracked, swollen, cut, or leaking. Replacing the O-ring during impeller service helps maintain proper sealing at the pump cover.

Installation Notes
Install on a clean pump cover sealing surface and inspect the groove for debris or damage before fitting the new O-ring. Confirm the O-ring matches the removed seal exactly before reassembly. Light lubrication with the appropriate service-safe lubricant can help prevent twisting or pinching during installation.

Alternate / Superseded Part Numbers

• X0506590-01
• 05-06-590

Parts Desk Insight
On raw water pump service, the O-ring is a small part that does an important job. Even when the impeller is being replaced routinely, reusing an old flattened O-ring can lead to cover leaks, air intrusion, or reduced pump performance. Matching by exact Yanmar part number and engine application is the safest approach.

Shipping
Shipping: Ships same or next day for fast Canada wide shipping.