JPR-MD65LF2 Aftermarket Mitsubishi S6R/S6R2 Camless Seawater Pump 37553-28100 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket JMP Mitsubishi camless seawater pump - Replacement Part Number: JPR-MD65LF2

A heavy-duty camless flexible-impeller pump for Mitsubishi S6A, S6B, S6R and S6R2 marine engines. The pump replaces the 37553-28100 family and accepts the engine-specific drive gear separately. Its internal cam profile is formed into the housing rather than fitted as a removable cam plate.

⚙️ Key Features

• Camless bronze housing with integral pumping profile

• 2-1/2-inch flanged seawater connections

• JMP 9100-01K flexible impeller

• Accepts S6A3, S6B5 or S6R/S6R2 drive gear according to engine

• Supersedes the earlier JPR-MD65LF pump

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• JPR-MD65LF2 → Supersedes JPR-MD65LF

• Mitsubishi 37553-28100 → Related replacement for 37553-18102, 37555-101N0 and 37553-10100 on specified engines

OEM / Related Numbers:

• JPR-MD65LF2

• JPR-MD65LF

• Mitsubishi 37553-28100

• Mitsubishi 37553-18102

• Mitsubishi 37555-101N0

• Mitsubishi 37553-10100

• Impeller: JMP 9100-01K

• Major service kit: JMP JSK006401

• Minor service kit: JMP JSM002101

• S6A3 drive gear: JMP GEA0010 / Mitsubishi 42763-00200

• S6B5 drive gear: JMP GEA0026 / Mitsubishi 34A53-01200

• S6R/S6R2 drive gear: JMP GEA0019 / Mitsubishi F2330-22005

Aftermarket / Verified Equivalents:

• JMP Marine: JPR-MD65LF2

🚤 Compatibility

Commonly used on:

• Flexible-impeller raw-water cooling systems

Typically suits:

• Engine models:

• Mitsubishi S6A and S6A3 marine diesel

• Mitsubishi S6B and S6B5 marine diesel

• Mitsubishi S6R marine diesel

• Mitsubishi S6R2 marine diesel

• HP Range: Engine-rating specific

• Engine Type: Gear-driven Mitsubishi inline-six marine diesel

• Year Range: Model-specific; confirm OEM pump and drive-gear number

• Seawater Connections: 2-1/2 in flange

• Dimensions: Approximately 295 × 213 × 186mm

• Weight: Approximately 22.05kg

• Impeller Reference: JMP 9100-01K

• Drive Gear: Ordered separately to suit S6A3, S6B5 or S6R/S6R2

🔌 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