Heat Exchanger

General
Manufacturer: Yanmar
Description: Heat exchanger
Model/Part Number: 128990-4440

Heat Exchanger O-rings
Manufacturer: Yanmar
Model/Part Number: 128990-44100
Description: O RING D65.6 X 3.53
Quantity: 4

Radiator Cap
Manufacturer: Yanmar
Model/Part Number: 129673-44131
Obsolete Model/Part Number: 128990-44130
Description: CAP 0.95 BAR

Coolant
Manufacturer: Yanmar
Description: Yanmar Diesel YG30R ELC Ultralife Coolant
Model/Part Number: 804056
Alternative: Zerex Nitrite Free Red Nitrite Free OAT Antifreeze or an equivalent ASTM D3306
Notes

• Coolant capacity: 4.3L
  
• Change interval: Every 5 years or 1000 hours
  

Heat Exchanger Cleaning

• It is critical to flush the engine with fresh water before a period of inactivity
  
• Pacwest in San Diego does NOT recommend cleaning the raw water system with Barnacle buster or other products because frequently this will lead to a pre-mature failure of the tubing inside of the heat exchanger