Engine JD 332 with Yanmar diesel runs hot

[sidecarwillie]

my temperature light comes on after about 45 minutes of mowing. I just got the mower with 1060 hours on it. i changed oil using Rotella 15/40. the antifreeze looks OK but i haven't checked the potency. Any suggestions?

 

[RhettWS]

You should also blow out your radiator if you have not already done do. I'm not familiar with them (Yanmar) but my old Kubota tractor basically had a wimpy radiator. It has a screen on the intake side that needs to be cleaned regularly or it will overheat, even with fresh coolant. I clean the screen after every use and blow the radiator out regularly depending on conditions. The tractor is about 40 years old and still runs pretty good. I think the radiator is undersized although if clean it works just fine.

Once you checked all that I suspect you might want to look into the thermostat and/or the water pump.

 

[reynoldston]

Your first thing to check is the coolant temperature to make sure if its a engine problem or gage problem.

 

[JD318420]

Also check the radiator cap, if it doesn't hold pressure it will also allow the engine to over heat.

 

[sidecarwillie]

You should also blow out your radiator if you have not already done do. I'm not familiar with them (Yanmar) but my old Kubota tractor basically had a wimpy radiator. It has a screen on the intake side that needs to be cleaned regularly or it will overheat, even with fresh coolant. I clean the screen after every use and blow the radiator out regularly depending on conditions. The tractor is about 40 years old and still runs pretty good. I think the radiator is undersized although if clean it works just fine.

Once you checked all that I suspect you might want to look into the thermostat and/or the water pump.

thanx, I should have thought of that first

 

[Glyn Robinson]

let us know what you find. best of luck!

 

[mechanic mark]

http://www.wfmfiles.com/download/manuals/TM1591.pdf

see troubleshooting guide page 220-10-4, G overheating

http://www.wfmfiles.com/download/manuals/CTM3.pdf

 

[sidecarwillie]

let us know what you find. best of luck!

I think in needs a flush. It looks like a build up around the tubes in the radiator.

 

[Glyn Robinson]

maybe that will help. certainly won't hurt.

 

[bordercollie]

http://www.wfmfiles.com/download/manuals/TM1591.pdf

see troubleshooting guide page 220-10-4, G overheating

http://www.wfmfiles.com/download/manuals/CTM3.pdf

Thanks ! This is great information.
My John Deere 332 with Yanmar 3TN66UJ engine is running hot so intend to give it a work over this winter I need it one more mow. (it's out of state) The water pump doesn't leak though and I have found that the replacements are rare to find- Not even sure that is the problem .
I need to flush the radiator first (see some corrosion) I think, so will start there. The temperature light comes on and stays on from the turn of the key so must be grounded some where do you think? I know it's hot though because it pukes a small amount of antifreeze out after a 30 min mow.
Thanks for opinions.