JPR-CP25UH Aftermarket JMP Marine V6/V8 Small- & Big-Block Gas Engine Seawater Pump | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket JMP crankshaft-mounted seawater pump - Replacement Part Number: JPR-CP25UH

A high-output crank-driven seawater pump for marine petrol V6 and V8 engines. It replaces Johnson F6B-9 pump families used by Volvo Penta, Indmar, PCM, Marine Power, Northern Lights and other marinised GM small-block and big-block installations. Fitment is determined by the original crankshaft flange, rotation, hose ports and OEM pump number.

⚙️ Key Features

• Crankshaft-mounted flexible-impeller pump

• High-output bronze F6B-pattern pump body

• No belt or separate pump pulley required

• JMP 7136K flexible impeller

• Direct replacement for the listed Johnson and Volvo Penta pump references

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• Johnson 10-24946-01 → Later F6B-9 service reference

• Johnson 10-24915-01 / 10-24805-01 / 10-24232-1 → Earlier related pump references

• Volvo Penta 857451 → Related replacement for 856957, 855722, 856513, 841640 and 826456 on specified engines

OEM / Related Numbers:

• JPR-CP25UH

• Johnson F6B-9

• Johnson 10-24232-1

• Johnson 10-24805-01

• Johnson 10-24915-01

• Johnson 10-24946-01

• Volvo Penta 826456

• Volvo Penta 841640

• Volvo Penta 855722

• Volvo Penta 856513

• Volvo Penta 856957

• Volvo Penta 857451

• Indmar 685001 / 685001-1 / 685001-3 / S685001

• Northern Lights 25-11030

• Impeller: JMP 7136K

• Cover: JMP COV0062

Aftermarket / Verified Equivalents:

• JMP Marine: JPR-CP25UH

🚤 Compatibility

Commonly used on:

• Flexible-impeller raw-water cooling systems

Typically suits:

• Engine models:

• Volvo Penta 430A, 430B, 431A and 431B

• Volvo Penta 500A, 500B, 501A and 501B

• Volvo Penta 570A, 571A, 572A, 740A and 740B

• Volvo Penta AQ200C, AQ200D and AQ200F

• Volvo Penta AQ211A

• Volvo Penta AQ225D, AQ225E and AQ225F

• Volvo Penta AQ230B, AQ231A and AQ231B

• Volvo Penta AQ255A and AQ255B

• Volvo Penta AQ271A, AQ271B, AQ271C and AQ271D

• Volvo Penta AQ290A and AQ311A

• Volvo Penta BB225A, BB225AV, BB225B and BB225C

• Volvo Penta BB231A, BB231B, BB255AV, BB260A, BB260AV, BB260B and BB261A

• Indmar GM V6/V8 packages using pump 685001 family

• PCM, Marine Power and Northern Lights petrol packages using the listed Johnson F6B-9 pattern

• HP Range: Engine-rating specific; commonly used from GM V6 through big-block V8 marine packages

• Engine Type: Crankshaft-driven marine petrol V6/V8 raw-water cooling system

• Year Range: Model-specific; confirm by exact OEM pump number and crankshaft mounting pattern

• Pump Pattern: Johnson F6B-9 crankshaft-mounted type

• Impeller Reference: JMP 7136K

• Installation Note: Verify rotation, crank flange, hose-port orientation and mounting clearance

🔌 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