RETAINER-LOCK 4540278 - Caterpillar

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Locations of the vent and drain plugs
(1) Coolant outlet
(2) Aftercooler drain plug
(3) Oil cooler drain plug
(4) Engine block drain plug
(5) Drain plug for the adapter
Remove the vent plug from coolant outlet (1). Open drain (2). Remove drain plugs (3), (4), and (5). Draining the Separate Circuit
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Remove vent plugs (6).
Open coolant drain valve (7). Clean the Cooling System
Use of commercially available cooling system cleaners may cause damage to cooling system components. Use only cooling system cleaners that are approved for Caterpillar engines.
After the cooling system has been drained, flush the cooling system with clean water in order to remove any debris.
Close the cooling system drain valves. Clean the drain plugs and install the drain plugs.
Fill the cooling system no faster than 19 L (5 US gal) per minute to avoid air locks.
If the aftercooler circuit has been drained, the vent plug must be opened to allow the aftercooler to fill properly. Failure to do this will cause an air lock resulting in engine damage.
When the separate circuit is filled, be sure to remove the vent plug.
Fill the cooling system with a mixture of clean water and Caterpillar Fast Acting Cooling System Cleaner. Add 0.5 L (1 pt) of cleaner per 15 L (4 US gal) of the cooling system capacity. Install the cooling system filler cap. Install vent plugs (1).
Start the engine. Operate the engine for a minimum of 30 minutes