9161F4-0653 Tohatsu BOLT

Illustration 1 g06248234
C175-16 Right Side View
(1) Engine block coolant drain
(2) Coolant sampling port
(3) Water pump drain
Illustration 2 g06248240
C175-16 Left Side View
(1) Water pump drain
(2) Coolant sampling port
(3) Oil cooler coolant drain
(6) Engine block coolant drainDrain the Cooling System
Drain the Cooling System
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). If the cooling system is not equipped with drain valves, remove drain plugs . Allow the coolant to drain.
Ensure that the jacket water drain valve is in the closed position before removing drain plug . Remove jacket water drain plug . Remove the O-ring seal. Install a new O-ring seal and a connector.
Attach a hose adapter and a hose with an inner diameter of 25 mm (1 inch).
Open the drain valve and allow the coolant to drain away from the electrical panel.
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.
For information regarding the disposal, recycling, and the parts required to drain the coolant, consult yourCat dealer, or Dealer Service Tools Group:Outside Illinois 1-800-542-TOOL
Inside Illinois 1-800-541-TOOL
Canada 1-800-523-TOOL
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.
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.
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 82 °C (180 °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.
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.
Allow the water to drain. Flush the cooling system with clean water until the water that drains is 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 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 L 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 82 °C (180 °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 water 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 is 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.
Illustration 3 g03071136
C175 16 and 20 cylinder
(2) Jacket water vent
Illustration 4 g02358597
Example of typical vent locations
(1) SCAC vent
(2) Jacket water vent