B3.9 and B5.9 Series Engines
Sea Water Pump (008-057)
Section 8 - Cooling System - Group 08
Shut off the raw water inlet valve on the vessel hull.
Remove the pump cover plate.
NOTE: It can be necessary to remove the impeller to ex-
amine for chunking or torn vanes.
If the impeller appears not to be damaged, clean and install
the cover plate.
If damaged vanes are evident, refer to the OEM service
Use a 4.76 mm [3/16 in] diameter brass rod to clean out any
buildup in the cooler tubes.
Use clean water to flush all debris from the cooler.
Be sure that the debris flushed from the cooler does not
enter the water supply pipe.