Yuchai thermostat 630-1306004 in the cooling system
This listing identifies a wax-type thermostat with part number 630-1306004. A thermostat regulates coolant flow according to temperature; the correct opening specification and physical fit must be confirmed for the engine variant. This page does not state a temperature rating or machine application.
Confirm the replacement before ordering
Record the Yuchai engine model and serial from the nameplate.
Compare the old thermostat marking with 630-1306004.
Check housing diameter, flange or locating features and sealing arrangement.
Verify the required temperature specification from the engine service information.
Consider the whole cooling system
Overheating or slow warm-up can have several causes, including coolant level, radiator restriction, fan drive, air in the system, sensor or gauge faults, and thermostat operation. Inspect the system safely when cool and follow the equipment procedure before replacing a component.
Installation checks
Use the specified gasket or seal, observe the required orientation, and refill and bleed the system as directed. After service, check for leaks and monitor temperature during a controlled operating check; do not open a hot pressurized cooling system.
FAQ
What temperature does 630-1306004 open at?
This record does not state a rating. Confirm the required value from engine documentation.
Can a thermostat be selected by outside diameter?
No. Verify part number, housing features and temperature specification.
Does overheating prove the thermostat has failed?
No. Check coolant, radiator, fan, air pockets and temperature indication as part of diagnosis.
Compatibility: Confirm engine serial, housing and specified temperature rating for 630-1306004.
