Sea Water Pump 128377-42500 Yanmar Johnson Pump 10-24509-01 24509-02 10-13337-01
Sea Water Pump 128377-42500 Yanmar Johnson Pump 10-24509-01 24509-02 10-13337-01
Sea-Water Pump 128377-42500
Complete Yanmar Pump Assembly – European Models
Yanmar Engine Fitment
This guide is to be used as a reference only. You must verify fitment using your engine model or serial number before purchase.
Fits the following European-built Yanmar diesel engines:
This pump is a European (Belgium/Netherlands) specification unit and is NOT compatible with Japanese-built models.
Pump Reference Numbers
- Johnson Pumps: 10-24509-01, 10-24509-02, 10-13337-01, 10-13492-01
- Yanmar Original: 128377-42500, 128397-42500
Direct bolt-on replacement – no modifications required.
Quick Installation Overview
- Close seacock and drain existing pump.
- Remove drive belt, unscrew mounting bolts (keep in order).
- Detach inlet/outlet hoses; catch residual water.
- Install new pump with original gasket/O-ring (supplied).
- Re-tension belt, open seacock, check for leaks & flow.
Professional Support
Send us a quick message with:
- Engine model (e.g., 3GM30-YEU)
- Serial number (critical for EU vs JP verification)
- Year of manufacture
We’ll double-check compatibility for you—free of charge.
Before You Buy
Please verify your engine model and serial number before purchase. Contact us for fitment confirmation. Free worldwide shipping from XRmarine.
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Boat Owners' Review
Before You Buy
Frequently Asked Questions
What is your refund policy?
We offer a 14-day hassle-free return on all products. Items must be unused and in original packaging. Every XRmarine part is also covered by our 1-year warranty against manufacturing defects. If something is not right, email us at info@xrmarineparts.com — replacement or full refund, your choice.
See our full Refund Policy for complete details.
How does shipping work?
Free international shipping on every order — no minimums. We operate a global warehouse network with a main distribution centre in Asia (10-20 business days). We also hold stock in regional warehouses across the United States, Germany, the United Kingdom, Australia, and Poland (opening soon) — most orders arrive in 1-3 business days within those countries and in 2-8 business days to nearby regions. Tracking included.
See our full Shipping Policy.
How do you keep prices fair?
We cut out the middlemen. XRmarine sources directly from quality manufacturers and sells at honest prices. Same OEM-quality parts, no dealership markup. Every order comes with free shipping, real expert support, and a 1-year warranty.
Learn more on our About Us page.
What payment methods do you accept?
We currently accept PayPal — a fast, secure way to pay online. Credit card payments (Visa, Mastercard, American Express) and Shopify Payments are being set up and will be available soon. We appreciate your patience.