0311750 JOHNSON SCREW,Manifold to cylinder

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.
Draining the Cooling System
Stop the engine and allow the engine to cool. Ensure that the engine will not start when the cooling system is drained.For information regarding the disposal and the recycling of used coolant, consult your Cat dealer or consult Cat Dealer Service Tools:Outside Illinois 1-800-542-TOOL
Inside Illinois 1-800-541-TOOL
Canada 1-800-523-TOOL
Dispose of used engine coolant properly or recycle. Various methods have been proposed to reclaim used coolant for reuse in engine cooling systems. The full distillation procedure is the only method acceptable by Caterpillar to reclaim the used coolant.
Draining the Jacket Water
Loosen the cooling system filler cap slowly to relieve any pressure. Remove the cooling system filler cap.
Illustration 1 g06610192
Locations of the drain plugs
(1) Oil cooler
(2) Cylinder block
Illustration 2 g06610197
(3) Drain plug in the elbow before the water pumpNote: If the engine is equipped with a jacket water heater, a water line will be installed in the location of drain plug (2).
Open the cooling system drain valves (if equipped). If the cooling system is not equipped with drain valves, remove drain plugs (1), (2), and (3).Drain the coolant from the bottom of the jacket water heater (if equipped).Draining the Separate Circuit
Remove the cooling system filler cap.
Drain the water from the heat exchanger or the radiator.Clean the Cooling System
After the cooling system has been drained, flush the cooling system with clean water to remove any debris.
Close the cooling system drain valves (if equipped). 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.
Fill the cooling system with a mixture of clean water and Cat Fast Acting Cooling System Cleaner. Add .5 L (1 pt) of cleaner per 15 L (4 US gal) of the cooling system capacity. Install the cooling system filler cap.
Start the engine. Operate the engine for a minimum of 30 minutes with a coolant temperature of at least 54 °C (129 °F).
Stop the engine and allow the engine to cool. For the jacket water and the separate circuit, loosen the cooling system filler cap slowly to relieve any pressure. Remove the cooling system filler cap. Open the cooling system drain valves (if equipped) or remove the drain plugs. Allow the cleaning solution to drain.
Improper or incomplete rinsing of the cooling system can result in damage to copper and other metal components.To avoid damage to the cooling system, make sure to completely flush the cooling system with clear water. Continue to flush the system until all signs of the cleaning agent are gone.
Flush the cooling system with clean water until the water that drains are clean. Close the cooling system drain valves (if equipped). Clean the drain plugs and install the drain plugs.Cleaning a Cooling System that has Heavy Deposits or Plugging
Note: For the following procedure to be effective, there must be an active flow through the cooling system components.
After the cooling system has been drained, flush the cooling system with clean water to remove any debris.
Close the cooling system drain valves (if equipped). Clean the drain plugs and install the drain plugs.
Fill the cooling system with a mixture of clean water and Cat Fast Acting Cooling System Cleaner. Add .5 L (1 pt) of cleaner per 3.8 to 7.6 L (1 to 2 US gal) of the cooling system capacity. Install the cooling system filler cap.
Start the engine. Operate the engine for a minimum of 90 minutes with a coolant temperature of at least 54 °C (129 °F).
Stop the engine and allow the engine to cool. Loosen the cooling system filler cap slowly to relieve any pressure. Remove the cooling system filler cap. Open the cooling system drain valves (if equipped) or remove the drain plugs. Allow the cleaning solution to drain.
Improper or incomplete rinsing of the cooling system can result in damage to copper and other metal components.To avoid damage to the cooling system, make sure to completely flush the cooling system with clear water. Continue to flush the system until all signs of the cleaning agent are gone.
Flush the cooling system with clean water until the water that drains are clean. Close the cooling system drain valves (if equipped). Clean the drain plugs and install the drain plugs.Fill the Cooling System
Fill the cooling system no faster than 19 L (5 US gal) per minute to avoid air locks.
Note: For information about the proper coolant to use, and for the capacity of the cooling system, refer to this Operation and Maintenance Manual, "Refill Capacities" and this Operation and Maintenance Manual, "Fluid Recommendations".
Fill the cooling system with coolant/antifreeze. Do not install the cooling system filler cap yet.
Start the engine. Operate the engine to purge the air from the cavities of the engine block. Allow the coolant to warm and allow the coolant level to stabilize. Stop the engine.
Check the coolant level. Maintain the coolant to the proper level on the sight gauge (if equipped). If a sight gauge is not equipped, maintain the coolant within 13 mm (.5 inch) below the bottom of the filler pipe.
Clean the cooling system filler cap. Inspect the gaskets of the coo