A fan shroud assembly is used to direct the airflow provided by the cooling fan. A missing or damaged fan shroud will reduce the amount of air flow provided by the cooling fan and can cause an engine coolant overheat condition. Check the fan shroud for damage and/or contact with the cooling fan. Replace any… Read More »
A malfunctioning fan drive can cause engine cooling problems. Various fan drive configurations are used to determine when the fan is driven, which include: • Direct drive – the fan is engaged all of the time • Air engaged/disengaged clutch • Electric/electromagnetic clutch • Viscous clutch • Hydraulic drive • Crankshaft/PTO driven. If the speed… Read More »
The engine cooling fan is typically driven by a crankshaft- driven belt. In some applications, the fan is located off the engine for a remote mounted cooling system . The cooling fan is supplied by the OEM and they must be contacted for any service-related information. This procedure only highlights some of the items related… Read More »
Collapsed or damaged coolant hoses can result in engine heating problems. Make sure to inspect all hoses for cracks, cuts, or collapsing. Replace any damaged hoses. NOTE: Silicone engine coolant hoses will exhibit swelling due to the elasticity of the hose.
Air forced through the fins of the radiator by a fan cools the coolant pumped through the radiator. Environmental debris (such as paper, straw, lint, and dust) can obstruct the fins and stop the flow of air, which will reduce the cooling effect of the radiator. The radiator must be inspected for benUbroken fins and… Read More »
A commonly overlooked item when troubleshooting the cooling system is the radiator pressure/expansion tank cap. The cooling system is designed to use a pressure cap to prevent boiling of the coolant. An incorrect, damaged, or malfunctioning cap can result in the loss of coolant and in an engine overheat condition. Refer to the OEM service… Read More »
A worn/incorrect belt, belt tensioner, or misaligned pulley can cause: • Belt slip • Belt jump or “walk off” • Noise • Belt breaks and shredding • Component bearing seizure. This can reduce water pump and/or cooling fan rotation speeds, resulting in an engine overheat condition. Refer to Procedure 008-002 in Section 8. Refer to… Read More »
A damaged or an incorrect water pump can lead to an engine overheat condition. To verify that the correct water pump is installed, reference the appropriate part information resources. Refer to Procedure 008-062 in Section 8.
There are different temperature range thermostats available depending on the engine type and application. The part number and nominal operating temperature are stamped on the thermostat. To verify that the correct temperature range and part number thermostat is installed, make sure to reference the appropriate part information resources. Refer to Procedure 008-013 in Section 8.… Read More »
The following procedure covers common troubleshooting steps to help identify: • Engine overheat causes. See the Initial Check section of this procedure. NOTE: At the end of this procedure, a worksheet is provided to record any measured values taken during troubleshooting. The worksheet will help in gathering and analyzing the data. • External and internal… Read More »