JPR-YM08IH2 JMP Marine Yanmar Replacement Engine Cooling Pump

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: Engine Cooling Pumps

Regular price $312.42


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  • JMP Yanmar Replacement Engine Cooling Pump #JPR-YM08IH2
    QTY: 1
  • Steel Pulley & Mounting Bracket

JPR-YM08IH2 is ONLY for 2GM or 3GM as per the cross-reference part numbers in the product information below. This should NOT be confused with 2GMF or 3GMF models. If you have the 2GMF or 3GMF please refer to JPR-YM08IH and its cross-reference information. If still unsure please contact us with your question.

You must use the JPR-YM08IH2 pump model to replace Yanmar 128377-42500 as there is a difference in revolutions per minute vs the JPR-YM08IH (Flow rate of JPR-YM08IH is greater vs JPR-YM08IH2) which some have thought is good for both this Yanmar number and 128397-42500 . . . this is not true. Use JPR-YM08IH2 to replace Yanmar 128377-42500.

What is the internal difference between JPR-YM08IH2 and model JPR-YM08IH?
The difference is the thickness of the machined "Cam" which is incorporated or part of the Body / Casing itself. The machined cam thickness is less (2mm) for JPR-YM08IH2 vs a larger thickness (4mm) found in the JPR-YM08IH. This is why it is very important to order the correct pump for your model of the engine by referring to the cross-reference information provided.

How to Install Mounting Bracket on Pump?
The mounting bracket does not come pre-installed on the pump; if you are using this bracket for your application you can find the step-by-step installation instructions by going the Blog Page Post "How to Install Mounting Bracket on JMP Marine Yanmar Replacement Engine Cooling Pumps JPR-YM08IH & JPR-YM08IH2" . . . CLICK HERE

Product Information:

Port Size (Inside Diameter)
1/2" HOSE
Port Size (Outside Diameter) Approx 3/4" HOSE
Uses JMP Impeller p/n
7050-01 (search 7050-01K)
Pump Size (LxWxH,mm) 91 x 114 x 76
Pump Weight (approx) 4.0 lbs (1.82 kgs)
Replaces Genuine Yanmar Pump p/n  Yanmar 128377-42500
Engine Model(s):
2GM, 3GM
Replaces Johnson Pump p/n
Johnson 10-24509-02, F4B-902
Parts Internally Compatible to Genuine NO (Internal Changes made for better performance & Reliability) 
Changes Made to Pump Mechanical Seal, Ball Bearing, Shaft, Machined Steel Pulley (Washer & Nut Included) 
Major Service Kit (All Internal Parts)
*Sold Separately
JSK0082 (For JPR-YM08IH2 Only)
Minor Service Kit
*Sold Separately
JSM0091 (For JPR-YM08IH2 Only)


  • Plug & Play Replacement
  • Simple & Compact Design (Less Parts)
  • Strong Bronze Body (Heavy Duty Marine Grade Casting)
  • High Performance and Long Life Flexible Impellers
  • Marine Grade Shaft (3X Series Non-Magnetic)
  • Mechanical Seal instead of Lip Seal
  • Heavy Duty Machined Steel Pulley
  • Cam-Less Design / Cam is machined in the Body Casing.

Orders of $500 or more gets free standard delivery.

  • Standard delivered 4-5 Business Days
  • Express delivered 2-4 Business Days

Orders are processed and delivered Monday-Friday (excluding public holidays)

JPR-YM08IH2 JMP Marine Yanmar Replacement Engine Cooling Pump

Regular price $312.42