over heating

[grumpytoo]

My Hinomoto E322 runs wonderful all day with box blade or front loader, when I use my bush hog it will over heat after mowing 1 acre. I've cleaned the radiator, added new anti-freeze/coolant, and made sure there is plenty of hydraulic fluid. What have I missed? It's a 35 horse three cylinder diesel made in Japan around 198?. All help will be very appreciated.

 

[jenkinsph]

Not much detail to work with but assuming you keep the side grills and the radiator clear of any debris or chaff I would try dropping down 1 gear and see if that helps. In continuous use you might be working the engine cooling system too hard.

 

[jinman]

As Steve mentioned, you left out a couple of needed details. When it gets hot, is it overflowing? If the temperature gage is showing hot, have you measured the temperature using a non-contact IR thermometer or something to show that the gage is not reading wrong/high? Have you checked the thermostat? You can normally check the thermostat by removing the radiator cap when the tractor is cold (don't do it hot) and then start the tractor and let it warm up. When the tractor comes to operating temperature, you should see moving water inside the radiator as the thermostat opens. A thermostat sticking or not opening fully could be causing your problems.

Also, while you have the radiator cap off, look for any air bubbles in the water. If you have a small headgasket leak into the water jacket, your tractor under load could be overheating the coolant by leaking hot compression/combuston into the water jacket.

 

[grumpytoo]

Yes it does boil over. I've tried pto 1,2, and 3 with 2,3 and 4 gears in high range. Creaper range is so slow it doesn't seem like it moves at all. Replaced thermostat last week, will check for bubbles in radiator.

 

[jinman]

Great info. . . sounds like you are doing all the right things. One other thing is the water pump. If the pump is working well, you should see water really moving in the radiator when the thermostat opens. In addition, you should feel lots of air going through the radiator fins. Is your fan shrouded? Of so, you should also feel the air behind the fan get really warm as the tractor heats up. I'd put something in front of the radiator to see if the air suction is strong and moving air even to the edges of the radiator. Someone may have painted the radiator and plugged up the fins or they could be filled with dirt near to the edges. It's also possible that the Hinomoto radiator is just not sufficient for your mowing environment and hot summer temperatures. You just never know. . . making sure air is flowing and moving heat off that radiator is my principle concern.

 

[Gator6x4]

What foot width is the bush hog, 4, 5, 6, 7 or 8? Tractors usually like one foot of bush hog width for each five (5) PTO horse power, not gross horse power but PTO horse power. A large bush hog will cause a tractor to heat up very quickly. Have you tried turning the PTO shaft by hand when it is disconnected from the tractor to see if the gear box and other parts of the bush hog are spinning freely and not in a bind? If the tractor has the original water pump you may also consider the impellar has worn away with age and is no longer circulating the volume of fluid needed to cool the tractor.

 

[wwand456]

is the coolit dirty have metal in it i seen a toyota trucks radiator broke the plastik off of it for scraping did not look good what about belts

 

[MHarryE]

Assume the engine has a belt drive fan. Have you checked the fan belt for tension and wear? At its age the fan belt may be worn to where it is no longer wedged in the grooves but may be riding on the bottom. Had that problem on my mini-excavator. Tensioned the belt per spec and I could turn the fan easily with the belt just slipping. Bought a new belt, checked against the old and found the old had worn 1/16" to 1/8". With the new belt installed and tensioned properly I couldn't turn the fan and my overheating problem was resolved.

 

[Jerry/MT]

My Hinomoto E322 runs wonderful all day with box blade or front loader, when I use my bush hog it will over heat after mowing 1 acre. I've cleaned the radiator, added new anti-freeze/coolant, and made sure there is plenty of hydraulic fluid. What have I missed? It's a 35 horse three cylinder diesel made in Japan around 198?. All help will be very appreciated.

Besides what others have said, checkto see that the lower rad does not collapse at high rpms (above idle) and that the radiator cap is the correct rating and is functioning properly. Check the airfilter for clogging. A clogged air filtr on a diesel will cause higher fuel/air ratios and higher peak gas temps in the cylinder.