08-15-2021, 05:42 AM
I am always reluctant to get involved in these discussions requiring part numbers as there are several iterations of the Yanmar engine. If you have a 4TN84TE-RKRV model engine (found on the valve cover),
Thermostat 129155-49800
Gasket under stat. 129150-49811
Tstat neck gskt 129795-49551
I rather suspect there is nothing wrong with the water pump. I never have had one go bad! And, there are a couple of different ones depending on your model number.
Pump 729428-42003
Gasket 129100-42020
You might be wise to replace the belt. 121492-42290
My suggestion is to call the Yanmar dealer for Ohio who also supplies sets to Newell. Martin Diesel 419-782-1198. Prompt 3 takes you to parts. HAVE YOUR MODEL NUMBER HANDY. You’ll go nowhere without it.
A couple things to check, look into the radiator directing your vision to the tubes. They should be open and not obstructed with buildup. Look at the fins on the engine side, they MUST be clear of debris. If not, clean them and remove any oily residue that would cause dust to stick to them.
A side note, my 20KW Kohler runs 4 tons of air conditioning and a few additional loads in 90 plus ambient without overheating. My digital gauge runs normally at 155 and the highest is 185. The shutdown switch is 223 degrees. Also, the engine temperatures are a little higher while underway.
Thermostat 129155-49800
Gasket under stat. 129150-49811
Tstat neck gskt 129795-49551
I rather suspect there is nothing wrong with the water pump. I never have had one go bad! And, there are a couple of different ones depending on your model number.
Pump 729428-42003
Gasket 129100-42020
You might be wise to replace the belt. 121492-42290
My suggestion is to call the Yanmar dealer for Ohio who also supplies sets to Newell. Martin Diesel 419-782-1198. Prompt 3 takes you to parts. HAVE YOUR MODEL NUMBER HANDY. You’ll go nowhere without it.
A couple things to check, look into the radiator directing your vision to the tubes. They should be open and not obstructed with buildup. Look at the fins on the engine side, they MUST be clear of debris. If not, clean them and remove any oily residue that would cause dust to stick to them.
A side note, my 20KW Kohler runs 4 tons of air conditioning and a few additional loads in 90 plus ambient without overheating. My digital gauge runs normally at 155 and the highest is 185. The shutdown switch is 223 degrees. Also, the engine temperatures are a little higher while underway.
Gordon Jones
2000-45'-2slide-#567