8980170272 Original ISUZU 4JJ1 Engine Thermostat 8980170272 for Excavator

The original thermostat (part number 8980170272, also known as 8-98017027-2) is designed specifically for Isuzu 4JJ1 series diesel engines. This engine is widely used in various medium-sized excavators, such as Sumitomo SH120-5, SH130-5, SH180-5, and Sany SY135C (National IV) models. As a genuine original accessory, this universal number is the only identifier to ensure that it matches perfectly with the engine cooling system pipeline interface, installation dimensions, and temperature control parameters. Please be sure to provide the specific model of the host and this universal number for verification when placing an order.

This product is a wax thermostat, and the core temperature sensing element is composed of high-purity paraffin wax and a precision metal shell. Its working principle is that when the coolant temperature is lower than the set value (usually 82-85 ° C), the main valve closes and the coolant undergoes a small circulation to quickly warm up the machine; After the temperature reaches the set value, the expansion of paraffin pushes the valve open, and the coolant enters the large circulation for heat dissipation. The valve body is made of corrosion-resistant copper alloy or stainless steel, and the sealing element is high-temperature resistant fluororubber, ensuring reliable operation within the engine cooling system pressure (usually about 0.1MPa) and temperature range of -30 ° C to 120 ° C. Its precise opening temperature and lift characteristics are key to ensuring that the engine is always in the optimal operating temperature range, achieving efficient combustion and low emissions.

It is recommended to check the thermostat function every 1000 working hours or annually. You can heat the thermostat in water and observe whether it starts to open at around 82-85 ° C and reaches full open at around 95 ° C. If the opening temperature deviation is too large, the valve is stuck or the seal is not tight, it should be immediately replaced with 8980170272 original parts. Before installation, it is necessary to clean the installation seat and replace the sealing gasket, and tighten it evenly according to the torque requirements. Daily attention should be paid to the coolant level and quality, avoiding the use of hard water or inferior antifreeze that can cause scale and corrosion. If the engine has slow warm-up, high or low water temperature, this component should be prioritized for troubleshooting. When storing, it should be moisture-proof and anti-collision to maintain the sensitivity of its temperature sensing components.