JPR-NL08IH Aftermarket Northern Lights M643/M673 Seawater Pump 25-12007 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket JMP Northern Lights M643/M673 seawater pump - Replacement Part Number: JPR-NL08IH

A compact direct-drive bronze seawater pump for Northern Lights M643 and M673 generator engines. It replaces Northern Lights 25-12007 and Jabsco 30415-7001 and includes the mounting O-ring.

⚙️ Key Features

• Heavy-duty marine bronze pump body

• Flexible-impeller positive-displacement design

• Marine-grade non-magnetic stainless-steel shaft

• Replaceable mechanical seal, bearings, cam and wear components

• Designed to match the listed OEM mounting, rotation and connection layout

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• Northern Lights 25-12007 → Replaces earlier 145016820 and 25-18305 references on specified engines

• Jabsco 30415-7001 is the original pump cross-reference

OEM / Related Numbers:

• JPR-NL08IH

• Northern Lights 25-12007

• Northern Lights 145016820

• Northern Lights 25-18305

• Jabsco 30415-7001

• Impeller: JMP 7070-01K

• Major service kit: JMP JSK0081

Aftermarket / Verified Equivalents:

• JMP Marine: JPR-NL08IH

Included Components:

• Complete seawater pump - Part Number: JPR-NL08IH

• Flexible impeller - Part Number: JMP 7070-01K

• Mounting O-ring - supplied

🚤 Compatibility

Commonly used on:

• Flexible-impeller raw-water cooling systems

Typically suits:

• Engine models:

• Northern Lights M643, M643K and M643M

• Northern Lights NL643

• Northern Lights M673, M673D and M673L

• Northern Lights M673L2, M673L3, M673LD2 and M673LD3

• Northern Lights NL673, NL673L, NL673L2 and NL673L3

• HP Range: Generator-engine rating specific

• Engine Type: Northern Lights three-cylinder marine diesel generator engine

• Year Range: Model-specific; confirm OEM pump 25-12007

• Seawater Connections: 1/2 in hose

• Dimensions: Approximately 110 × 117 × 81mm

• Weight: Approximately 1.4kg

• Impeller Reference: JMP 7070-01K

🔌 Function

The seawater pump draws raw water through the intake and circulates it through the engine, heat exchanger, oil cooler, aftercooler and wet-exhaust circuit as applicable. Its flexible impeller must maintain adequate flow from idle through full load while the shaft, bearings and mechanical seal keep the drive and water sections correctly supported and separated.

Common signs of failure:

• Engine temperature rises under load or at higher RPM

• Reduced or intermittent water discharge from the exhaust

• Missing, cracked, swollen or permanently set impeller vanes

• Seawater leakage or salt tracks from the shaft seal or weep area

• Bearing noise, pulley or gear wobble, or excessive shaft movement

• Scored cover plate, worn cam or damaged pump housing reduces suction

• Internal corrosion, air leakage or blocked inlet passages cause loss of prime

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging