RDG603A73 - Issue 3
Page 52 of 96
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Drain water from the heat exchanger. The drain plug is in the bottom of the heat
exchanger end cap.
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Disconnect the pipes and hoses from the engine heat exchanger.
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Remove the heat exchanger from the engine.
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Mark the position and remove the end caps from the heat exchanger.
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Carefully remove the tube stack from the centre if the heat exchanger.
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Fully flush between the tubes to remove any dirt or scum build up.
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Inspect the tube stack and replace if damaged.
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Reassemble and refit, checking the end caps “O” rings are in good condition.
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Ensure the end caps are fitted in the correct orientation. If they are not in the correct
orientation, overheating will occur which will not be covered under the warranty.
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Refill the engine with coolant as described earlier.
16. Winterization of Seawater Cooling System
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To prevent frost damage to the seawater cooling circuit components due to freezing,
ensure all seawater or raw water is drained from the system.
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Alternatively, run neat antifreeze through the seawater pump inlet to protect the
system.
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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.
