Yanmar Engine Gasket X0506590-01
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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Alternate / Superseded Part Numbers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. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.