RDG603A13
– Issue 19
Page 61 of 97
For River Boats
When the engine is cold, drain the water from the engine block. Remove the plug from
the engine block by the starter motor.
Drain water from the heat exchanger. The drain plug is in the bottom of the heat
exchanger / water cooled manifold.
Mark the position and remove the end caps from the heat exchanger along with the
“O” rings. When refitting the end caps please ensure that they are in the same
orientation as they were previously.
Carefully remove the tube stack from the centre of the heat exchanger.
Fully flush between the tubes to remove any dirt of scum build up.
Inspect the tube stack and replace if damaged.
Clean out the manifold if required.
Reassemble and refit, checking the end cap “O” rings are in good condition.
Refill the engine with coolant as described earlier.
16. Winterization of Seawater Cooling System (Work Boat & River Boat)
To prevent frost damage to the seawater cooling circuit components due to water
freezing, ensure all seawater or raw water is drained from the system.
Alternatively, run neat antifreeze through the seawater pump inlet to protect the
system.
Ensure that the antifreeze is drained before starting the engine during the next season.
This is to ensure that it does not get into the marine environment. Dispose of the
antifreeze correctly.
