Genuine Yanmar Sea Water Pump – 6LY2 Series 119574-42503
$4,897.90 NZD incl. GST
In stockFreight calculated at checkout
- In business since 1927
- Backed by our Auckland workshop
- Capricorn preferred supplier
- Delivery across NZ and worldwide
Shipping & delivery
Freight is calculated at checkout by weight and volume. Orders over 25 kg or 2.5 m³: we'll email the freight cost after you order.
Standard delivery: 2–5 working days. Rural: 4–6 working days.
Click & Collect: we'll call to arrange a time at 77 Leonard Road, Mount Wellington, Auckland.
Outside New Zealand? Contact us for a freight quote.
Returns & warranty
Returns are handled under our refund policy. Your rights under the Consumer Guarantees Act are not affected.
For warranty claims, email sales@simmsdiesel.co.nz with proof of purchase and photos, and contact us before fitting a replacement. See warranty.
Product details
Genuine Yanmar Sea Water Pump – 6LY2 Series (Raw Water Cooling)
Complete marine raw water (sea water) pump assembly designed specifically for Yanmar 6LY2 series marine diesel engines. This pump circulates sea water through the engine’s heat exchanger and exhaust system to keep temperatures controlled under load.
Current & Superseded Part Numbers
✔ Current Genuine Yanmar Part Number:
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119574-42503 – Latest current Yanmar sea water pump replacement for this series.
✔ Supersedes Older Yanmar Part Numbers: -
119574-42502 (primary old number)
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119574-42501
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119574-42500
Cross-Reference / Equivalent Options
Aftermarket / Direct Replacement Parts:
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#JPR‑YM06LY2 JMP Marine Replacement Engine Cooling Seawater Pump – Premium aftermarket seawater pump that directly replaces Yanmar 119574-42502 / 119574-42503 & Johnson 10-13170-01.
Impeller & Service Kits (Recommended for Maintenance):
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Pump Repair Kit (Major) for Yanmar 6LY2 Sea Water Pump – Major overhaul internal parts kit.
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Service Kit (Major) Yanmar 6LY2 Sea Water Pump – Full service kit for internal impeller, seals & wear parts.
(Both kit options service Yanmar 119574-42502 / replacements)
Compatible Engine Models
This raw water pump assembly is used on the following Yanmar 6LY2 marine diesel engines:
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6LY2-ST
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6LY2-STVY
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6LY2-WST
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6LY2-WDT
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6LY2-WDTZY
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6LY2M-WDT / 6LY2M-WST
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6LYA-STE
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6LYA-STP
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6LYA-UTE
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6LY2-STE
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6LY2A-STP / 6LY2A-UTP
(This reflects the typical LY2 series marine engine variations.)
Features & Notes
✔ Type: Sea water / raw water pump for engine cooling loop
✔ Port Style: Hose-type outlet (fits standard raw water hoses)
✔ Mount: Direct bolt-on replacement for original Yanmar part
✔ Replaces Johnson Pump: Equivalent to Johnson 10-13170-01 in many cross references.
Service Tips
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Always install a fresh impeller (Yanmar impeller 119574-42550 or equivalent in service kits) when installing a new pump.
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Check all hoses, clamps and the mounting o-ring/gasket to prevent leaks.
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Regular maintenance of this pump can extend engine life and avoid overheating.