A precision wax-type thermostat that automatically regulates engine coolant flow to maintain optimal operating temperature (approx. 82°C). Prevents overheating, ensures fast engine warm-up, and protects critical components in ISUZU 10PE1 heavy-duty diesel engines.

The Thermostat Assembly (OEM Numbers: 1-13770080-1, 1-13770089-1, 1137700801, 1137700891) is a premium-quality, direct replacement component engineered specifically for the ISUZU CXZ81 series heavy-duty trucks, as well as a broad range of GIGA C/E series trucks, Hitachi, Case, excavators, and other heavy equipment powered by the legendary ISUZU 10PE1, 6WG1, 6WF1, 6RB1, 6UZ1, and 6HK1 industrial diesel engines.

This thermostat is the heart of the engine's temperature regulation system. It controls the flow of coolant between the engine and the radiator, ensuring the engine warms up quickly to reduce wear and fuel consumption, while preventing overheating under heavy load.

• Cold Start: When coolant temperature is low (approx. below 70°C), the wax pellet is solid and the valve remains closed. Coolant is restricted to a "small cycle" within the engine block, allowing it to heat up rapidly to operating temperature.
• Normal Operation: As coolant temperature rises (approx. above 80°C), the wax expands, pushing the valve open. Coolant then flows through the radiator in a "large cycle" for maximum cooling, dissipating excess heat from this high-output engine.

• Dimensional Accuracy: All critical dimensions and sealing surfaces are verified against OE blueprints using CMM equipment to ensure a perfect fit in the 10PE1 cooling system housing.
• Opening Temperature Calibration: Sample units are batch-tested to ensure the thermostat begins to open at the precise, factory-calibrated temperature (approx. 82°C), guaranteeing correct engine thermal management.
• Wax Pellet Integrity: The wax-filled copper capsule is validated for consistent expansion and reliable operation over thousands of heating and cooling cycles.
• Valve Lift Test: Valve travel is verified to meet OE specification, ensuring adequate coolant flow when the engine is at operating temperature and under heavy load.
• Spring Fatigue Test: The return spring is tested for consistent closing pressure after thermal cycling, ensuring positive valve closure without sticking or flutter.
• ISO 9001:2015 / IATF 16949 Certified: The manufacturing facility meets international automotive quality management standards, ensuring consistent, traceable, and reliable output for wholesale commercial fleets and heavy equipment dealers.
• Packaged Safely: Each thermostat is individually sealed in a moisture-barrier bag and boxed with OE-style part labeling to prevent dust ingress and transit damage.

• Individual Packaging: Each thermostat is individually sealed in a moisture-barrier bag and boxed with OE-style part labeling.
• Wholesale / Bulk Orders: Available for heavy-duty parts distributors, construction equipment dealers, workshop chains, and international exporters -- sold in case packs of 5, 10, 20, 50 units; pallet pricing available for volume orders.
• Customization: Neutral or private-label retail packaging (including custom barcode labels) is available for volume wholesale orders (minimum order quantity applies). Discuss your branding requirements with our sales team.
• Fast Shipping: Ready stock for immediate dispatch worldwide via express courier (DHL, FedEx, UPS) for urgent fleet repairs, or economical sea freight from central logistics hubs (Guangzhou, Singapore, Rotterdam, Los Angeles).
• Wholesale Support: Long-term supply agreements, tiered commercial pricing, and drop-shipping options available for approved distributors. Contact our ISUZU cooling systems department to set up a wholesale account today.

For pricing, availability, or bulk purchase of the ISUZU Thermostat 1-13770080-1 / 1-13770089-1 for 10PE1, CXZ81, and compatible Hitachi excavator applications, please contact our sales team for a competitive wholesale quote and expert technical support. We respond to all inquiries within 24 hours.