KIT-SEAL 1358860 - Caterpillar

Illustration 1 g01848875
Replace the coolant temperature regulators (1) before the regulators fail. Replacing the coolant temperature regulator is a recommended preventive maintenance practice. Replacing the coolant temperature regulators reduces the chances for unscheduled downtime.A coolant temperature regulator that fails in a partially opened position can cause overheating or overcooling of the engine.A coolant temperature regulator that fails in the closed position can cause excessive overheating. Excessive overheating could result in cracking of the cylinder head or a seizure of the pistons.A coolant 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. Also, a low temperature can allow moisture to condense in the oil. The low temperatures can form damaging acids.
Failure to replace the water temperature regulator on a regularly scheduled basis could cause severe engine damage.Never operate an engine without the water temperature regulator installed.If the water temperature regulator is installed incorrectly, the engine may overheat, causing cylinder head damage. Ensure that the new water temperature regulator is installed in the original position.
For the procedure to replace the coolant temperature regulators, see the Service Manual, "Disassembly and Assembly" module. Consult your Cat dealer for assistance.Note: If only the coolant temperature regulators are replaced, drain the coolant from the cooling system to a level that is below the regulator housing.