B3.9 and B5.9 Series Engines
Sea Water Heat Exchanger (008-053)
Section 8 - Cooling System - Group 08
Use a 4.76-mm [3/16-in] diameter brass rod to clean out
any buildup in the heat exchanger tubes.
Use clean water to flush the heat exchanger tubes from the
rear. Make sure the end cavities are cleared of all debris.
Use new sealing washers (2) and gaskets (4) when install-
ing the end caps (3).
Tighten the retaining screws (1).
11/16 and 7/8 Inch
Install the zinc plug.