The Caterpillar 9Y-8540 Water Temperature Regulator Housing (Thermostat Housing Cover) is a heavy-duty cooling system component. It encloses and protects the engine thermostat, managing the flow of engine coolant between the engine block and the radiator to maintain the correct operating temperature and prevent thermal overheating.
1. Core Dimensions & Weight
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Length: Approximately 210.00 mm (8.27 in)
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Width: Approximately 180.00 mm (7.09 in)
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Height: Approximately 150.00 mm (5.91 in)
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Average Weight: 2.10 kg (4.63 lbs)
2. Material & Operational Specs
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Material Grade: High-strength cast aluminum alloy or premium ductile iron structure designed to resist internal coolant corrosion.
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Pressure Capacity: Specifically engineered to withstand continuous coolant pressure up to 240 kPa (34.8 psi) without structural flexing or seal leakage.
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Sealing Profile: Machined flat mating surface optimized to sit perfectly flush against the engine block bypass group or water pump adapter.
3. Equipment & Engine Compatibility
This regulator housing is utilized across specialized medium and large-bore Caterpillar heavy equipment, commercial marine setups, and petroleum groups:
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Engine Platforms: Highly integrated within the cooling water groups of Caterpillar C9, C9 ACERT, 3176B, 3176C, 3196, and C-12 block systems.
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Heavy Earthmoving Machinery: Standard temperature management hardware for CAT 973C Track Loaders, 814F Wheel Dozers, and 815F / 816F Soil Compactors.
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Excavators & Marine Systems: Deployed across flagship heavy machinery lines including CAT 330D and 336D crawler excavators, alongside matching C9 petroleum auxiliary power packages.
4. Part Cross-References
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Alternative Part Names: Thermostat Housing, Water Regulator Cover, HUS.
- Alternative Part Numbers: 9Y8540, 9Y-8540.
