119773-42570 Yanmar Water Pump O-Ring | Genuine OEM Marine Part

🔧 Product Description

Genuine Yanmar Sea Water Pump Cover O-Ring - Part Number: 119773-42570

A genuine Yanmar O-ring used beneath the sea-water-pump cover plate on numerous JH- and 6LP-series marine diesel pumps. It seals the removable impeller cover so the pump can prime and maintain suction without drawing air or leaking seawater.

⚙️ Key Features

• Genuine Yanmar sea-water-pump cover O-ring
• Factory elastomer and cross-section for the specified pump cover groove
• Reusable only if undamaged; replacement is recommended whenever the cover is opened
• Used with both direct-mounted and front-mounted sea-water-pump arrangements

🚤 Compatibility

Commonly used on

• Yanmar 3JH4E and 3JH5E
• Yanmar 4JH4E, 4JH5E, 4JH45, 4JH57, 4JH80 and 4JH110 pump families
• Yanmar 6LP-DT/DTE/DTZE, 6LP-ST/STE/STZE and related WDT/WST variants
• Yanmar 6LPA-STP/STZP and related later LP-series variants
• Electric-generator and auxiliary-engine versions using the same sea-water-pump cover

Typically suits

• HP Range: Engine-model dependent
• Engine / System Type: Yanmar JH- or LP-series marine diesel sea-water pump
• Year Range: Approximately 2000s onward, with broad pump-family application
• Serial / Identification Range: Confirm the sea-water-pump model and cover-plate groove. Yanmar uses several similar pump-cover seals across different pump manufacturers and engine families.

🔌 Function

Seals the sea-water-pump cover plate so the pump remains airtight on the suction side and seawater does not leak around the cover.

⚠️ Common Signs of Failure

• Seawater leaks from the pump cover
• Pump fails to prime after impeller service
• O-ring is flattened, cut, swollen or brittle
• Cover groove is corroded or damaged
• Impeller has been inspected or replaced and the cover has been removed

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 119773-42570 - current verified Yanmar service reference
• No later direct Yanmar supersession confirmed

OEM / Related Numbers

• 119773-42570
• 11977342570

Aftermarket / Verified Equivalents

• JMP / aftermarket O-ring replacement for Yanmar 119773-42570
• Generic O-rings should not be substituted without confirming seawater-resistant material and exact cross-section

📦 Condition

• Genuine Yanmar OEM marine O-ring, brand new.
• Brand new
• Supplied in manufacturer or equivalent protective packaging