COVER 1U3515 - Caterpillar

Replace the water temperature regulator before the water temperature regulator fails. This is a recommended preventive maintenance practice. Replacing the water temperature regulator reduces the chances for unscheduled downtime.A water temperature regulator that fails in a partially opened position can cause overheating or overcooling of the engine.A water temperature regulator that fails in the closed position can cause excessive overheating. Excessive overheating could result in cracking of the cylinder head or piston seizure problems.A water temperature regulator that fails in the open position will cause the engine operating temperature to be too low during partial load operation. Low engine operating temperatures during partial loads could cause an excessive carbon buildup inside the cylinders. This excessive carbon buildup could result in an accelerated wear of the piston rings and wear of the cylinder liner.
Failure to replace the temperature regulators on a regularly scheduled basis could cause severe engine damage.Never operate the engine without the temperature regulators installed.If the temperature regulator is installed incorrectly, the engine may overheat, causing cylinder head damage. Ensure that the new temperature regulator is installed in the original position.
Refer to the Service Manual for the replacement procedure of the water temperature regulator, or consult your Caterpillar dealer.Note: If only the water temperature regulators are replaced, drain the coolant from the cooling system to a level that is below the water temperature regulator housing. Fill the engine with coolant to the correct level once the new water temperature regulators have been installed. Be sure to use the correct type of coolant. The coolant should always be maintained at the correct concentration.