Yanmar Bolt 128990-42170

The Yanmar part 128990-42170 is a bolt spacer designed for the sea water cooling pump assembly in select marine diesel engines. This component secures the spacer within the water pump, maintaining correct alignment and sealing of the cooling system components. It is tailored for specific engine models, particularly those in the YM series.

• 2YM15
• 3YM20
• 3YM30

If you are replacing a component on your sea water pump, it's a good practice to replace all related hardware, especially if any of the bolts show signs of corrosion.