Raw Water Pump – Fits Northern Lights 6KW and Under Series Generators (Replaces 25-12007, 145016820, 25-18305)

Raw Water Pump – Fits Northern Lights 6KW and Under Series Generators

This raw water pump is designed for Northern Lights 6KW and under series generators, including the M643, M673, NL643, NL673 model lines and their variants.

It serves as a direct replacement for several OEM and aftermarket part numbers, including Northern Lights 25-12007, 145016820, and 25-18305; Jabsco 30415-7001; JMP JPR-NL08IH; and Ancor 298.

• Installation: Mounts as a direct replacement to the original.
• Housing: Constructed from marine-grade bronze for durability in saltwater environments.
• Included Parts: Comes with the pump assembly and a required O-ring mounting gasket.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Raw Water Pump (Replaces 25-12007)
• 1 x O-Ring Mounting Gasket

Installation Guide

1. Ensure the engine is off and cool. Close the raw water intake seacock.
2. Place a container below the pump to catch any spilled coolant or water.
3. Loosen the hose clamps and carefully disconnect the inlet and outlet hoses from the pump.
4. Remove the mounting bolts that secure the pump to the engine bracket.
5. Gently detach the old pump from the engine. You may need to lightly tap it to break the seal.
6. Thoroughly clean the pump mounting surface on the engine, removing any old gasket material or sealant.
7. Place the new O-ring or gasket onto the new pump or engine mounting surface.
8. Align the new pump with the mounting holes and install the bolts, tightening them evenly to the manufacturer's specified torque.
9. Reconnect the inlet and outlet hoses and secure them with the clamps.
10. Open the raw water seacock.
11. Start the engine and immediately check the pump and hose connections for any water leaks.
12. Monitor the engine temperature to ensure the cooling system is functioning correctly.

Troubleshooting & FAQ

Q: How do I know if this pump fits my generator?

A: This pump is designed for Northern Lights 6KW and under series generators, such as the M643 and M673 models. To ensure compatibility, compare your old part number to the cross-reference list: 25-12007, 145016820, 25-18305, Jabsco 30415-7001, JMP JPR-NL08IH, or Ancor 298.

Q: What does "bidirectional rotation" mean?

A: A bidirectional pump is designed to operate correctly regardless of whether the engine rotates it clockwise or counter-clockwise. This feature allows it to be used on a wider variety of engine configurations without modification.

Q: What are the common signs that my raw water pump needs to be replaced?

A: Key indicators of a failing pump include the engine running at a higher temperature than normal, a noticeable reduction in water flow from the exhaust outlet, visible water leaks around the pump body or shaft seal, or unusual grinding/squealing noises from the pump during operation.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.