JMP Marine JPR-YM08IH Yanmar Engine Cooling Seawater Pump Replacement


Sale price$271.68
7 In stock Free Shipping


The JPR-YM08IH is a Yanmar replacement engine cooling seawater pump. 

Q: What is the internal difference between JPR-YM08IH and model JPR-YM08IH2?

A: The difference is the thickness of the machined "Cam" which is incorporated or part of the Body / Casing itself. The machined thickness of YM08IH is greater (4mm) vs a smaller thickness (2mm) found in the JPR-YM08IH2. So, the JPR-YM08IH model gives higher flow rate vs JPR-YM08IH2. This is why it is very important to order the correct pump for your model of engine by referring to the cross-reference information provided.


Q: What does the JPR-YM08IH replace?

A:The JPR-YM08IH replaces Yanmar 128397-42500, 128990-42500, Johnson 10-24509-01, 10-13337-01, F4B-903.


  • Genuine Engine MFG Sea Water Pump P/N: Yanmar 128397-42500 / 128990-42500
  • 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


  • (1) JPR-YM08IH (Yanmar Replacement Pump)
  • (1) Steel Pulley & Mounting Bracket

Compatible Engine Models:

  • 2GMF
  • 3GMF
  • 2YM
  • 3YM


  • Genuine Yanmar Water Pump 128397-42500
  • Genuine Yanmar Water Pump 128990-42500
  • Johnson Pump 10-24509-01
  • Johnson Pump 10-13337-01
  • Johnson Pump F4B-903


jmp impeller 7050-01K
major service kit JSK0082 (All Internal Parts) (*Sold Separately)
minor service kit JSM0091 (*Sold Separately)
port size 1/2" Hose (Inner Diameter)
pump size L: 91mm W: 144mm H: 76mm
pump weight 4.0 lbs (1.82 kgs) (Approx)

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