Replacing The Seawater Pump Rotor - Nanni H4.115 Instruction Manual

Cooling circuit - seawater

Replacing the seawater pump rotor

The seawater pump rotor is an essential component. It
must be replaced regularly along with the seal. A worn rotor
could crack and damage the cooling system. Always have a
replacement rotor on board the craft.
• Close the seawater intake valve.
• Remove the seawater pump cap A and the seal B, then
remove the rotor C without damaging it.
• Check the condition of the rotor: replace it if even the
most minor defect is noted.
• Clean the elements retained.
• Fit a new rotor by turning it clockwise.
• Lubricate the pump casing and the inside of the lid with
waterproof grease for rubber.
• Refi t the water pump cap using a new seal.
• Open the seawater intake valve and then start the en-
gine to check that the circuit is leak-tight.
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C
B
Maintenance
A