The Yanmar Thermostat Ø76.5 mm (129470-49801) is designed to regulate engine operating temperature by controlling coolant flow in Yanmar 3JH and 4JH series marine diesel engines . Proper thermostat operation is essential for efficient combustion, reduced engine wear, and stable cooling system performance.
Manufactured to precise OEM specifications, this thermostat ensures accurate opening temperature, reliable operation, and correct fitment. It is suitable for routine maintenance, cooling system servicing, or replacement of a faulty thermostat to prevent overheating or overcooling.
Product Type
Engine thermostat
Part Number
129470-49801 (replaces / supersedes 129470-4980)
Diameter
Ø 76.5 mm
Compatibility
3JH Series
Yanmar 3JH25
Yanmar 3JH30
Yanmar 3JH2 (B)E
Yanmar 3JH2 T(B)E
Yanmar 3JH3 E
Yanmar 3JH4 E
Yanmar 3JH5 E
Yanmar 3JH40-CR
4JH Series
Yanmar 4JH E
Yanmar 4JH TE
Yanmar 4JH HTE
Yanmar 4JH DTE
Yanmar 4JH2 (B)E
Yanmar 4JH2 T(B)E
Yanmar 4JH2 HT(B)E
Yanmar 4JH2 DT(B)E
Yanmar 4JH2 UT(B)E
Yanmar 4JH3E EU
Yanmar 4JH3 TE
Yanmar 4JH3 HTE
Yanmar 4JH3 DTE
Yanmar 4JH4 E
Yanmar 4JH4 AE
Yanmar 4JH4 TE
Yanmar 4JH4 HTE
Yanmar 4JH5 E
Yanmar 4JH45-CR
Yanmar 4JH57-CR
Yanmar 4JH110-CR
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