Yanmar Pump Gear 119773-42520 - Marine Diesel Engine
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Yanmar 119773-42520 is a genuine OEM gear pump / sea water pump drive gear used in selected Yanmar marine diesel cooling-system assemblies. Current Yanmar parts references identify 119773-42520 as GEAR, PUMP, and place it in the cooling sea water pump section of the parts schematic.
This part is the drive gear for the sea-water pump assembly, making it a critical cooling-system component on applicable engines. Current fitment references connect it with selected 6LPA-series Yanmar diesel engines, including 6LPA-DTE, 6LPA-STE, 6LPA-STZP2, and 6LPA-STZP3.
Key Features
- Genuine Yanmar OEM pump gear (Gear Only) no housing
- Part number: 119773-42520
- Current Yanmar description: GEAR, PUMP
- Used in the cooling sea water pump assembly
- Current Yanmar Shop schematic lists it as item 19 in the relevant sea-water pump diagram.
Engine Compatibility
Current fitment references connect Yanmar 119773-42520 to selected 6LPA-series marine diesel engines including:
- 6LPA-DTE
- 6LPA-STE
- 6LPA-STZP2
- 6LPA-STZP3
Additional current source coverage also ties this part into 6LPA-STP2 application references, depending on the exact pump/engine configuration. Serial-number confirmation remains the safest fitment path.
Serial Number Fitment Notice
Fitment should always be confirmed by engine model and serial number before ordering. Current Yanmar parts-catalog pages place this gear within specific cooling-pump schematics, so matching by exact engine configuration is the right way to protect accuracy.
When This Part Needs Replacement
Replace this gear pump component when:
- the sea-water pump drive gear shows wear or tooth damage
- cooling-system service reveals gear damage or abnormal backlash
- the sea-water pump assembly is being rebuilt and the drive gear no longer meets reuse condition
- cooling performance issues trace back to worn pump-drive components
Installation Notes
- Confirm exact fitment by engine model and serial number first.
- Inspect the related sea-water pump assembly, shaft, seals, and mating drive components during service.
- Current Yanmar schematic references place this gear alongside the sea-water pump assembly and related pump-service parts, making it a smart time to inspect the full pump system together.
Alternate/Superseded Part Numbers
Current reviewed references identify 119773-42520 as the active Yanmar part number for this gear pump component. Current Yanmar Shop product pages show no supersession on the listed part entry.
Parts Desk Insight
This is the gear part only. On gear-driven sea-water pumps, the drive gear matters just as much as the impeller side of the service. When tooth wear or drive damage is present, replacing the worn gear helps protect pump timing, cooling performance, and long-term reliability across the full sea-water pump assembly.
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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
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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.
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