HARNESS AS 1268871 - Caterpillar

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.
A 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 temperature regulator that fails in a partially opened position can cause overheating or overcooling of the engine.A 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.For the procedure to replace the temperature regulators, see the service information that is provided by the OEM of the temperature regulators.