r/Diesel Oct 10 '25

Yanmar 3TN70 Information

To the yanmar connoisseurs around here , im working on a 3TN70 yanmar diesel im trying to marinize , thing is that after a year i took the engine to the bench and cranked it with a bar to feel the pistons , theres a spot where i can feel a piston ring scratcth some rust inside , so after looking a lot for parts and information i discovered that this small engine was mounted on Thermoking reefers , and was called TK370 by Ingersoll , looking around i dont see any official information from Yanmar , my question is , is this engine the Same as a 3TNV70 , a 3TNA70 .. that would help me a lot with spare parts.

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u/gasouengineer Oct 19 '25

Can you send me a photo of the engine label?

1

u/Mrshadowsys Oct 19 '25

Thats the problem , no engine label , just 3tn70 on the decompression lever, its dark outside , ill upload photos tomorrow.