706 Running Hot?

Anonymous-0 · Nov 23, 2008

Guys,

When plowing with the 706 (D282) in heavy sod with 2 14's, the temp quickly gets up to 220 degrees. It runs around 190 at idle. This seems too hot, but before I tear into things I wanted to check with the experts. Any help is appreciated.

By the way, air temp is around 35 degrees.

Thanks

farmhand · Nov 23, 2008

If your thermostat is bad it will open and let the water flow to quickly and not cool properly in the radiator or it could be getting sticky and not opening at the correct temp to let it cool when it should also if the tractor fuel pump timimg is set to the high side it will cause it to run warm.

Heat Houser · Nov 23, 2008

A typical temperature drop (difference) between the top radiator tank and bottom tank will be around 12-16 degrees. (Must be hot enough for the thermostat to be fully open when measuring) If little difference, something is wrong with the air flow, plugged fins, slipping belt, fan on backwards, etc. If a large difference, the problem is with coolant flow, tubes plugged, water pump impeller broken, stuck thermostat, etc.

Bob M · Nov 23, 2008

Your "overheating" problem could be as simple as a faulty water temp gage (it's happened to me with a couple different tractors...)

Before digging in too deep recommend checking the temp gage calibration: Remove the gage sender, stick it into a container of boiling water then note the gage reading. (If's it's an electric gage, remove the sender, reconnect the gage wire and hook up a temporary ground to the sender. Now dip the wired-up sender into a container of boiling water, turn on the ignition and note the gage reading.)

A good gage/sender will show 212 deg +/-5 deg or so with the sender immersed in boiling water.

Anonymous-0 · Nov 23, 2008

Thanks for the replys. Here is some more info:

Thermostat appears to kick open around 190.

Once open for a few minutes, I measured the coolant with a cooking thermo and it was the same temp as the gauge (190), so I think the gauge is ok.

While doing this, the coolant almost overflowed the filler. I assume this is because I had the cap off...but could it mean I have a plugged hose or water passage somewhere?

I also pulled out a few inch long pieces of sealant that were floating in the coolant...bad sign?

Can the thermostat open too far and allow the coolant to circulate too fast?

And just so I know...how hot is too hot for a D282 while working hard?

Thanks again

mattofvinings · Nov 24, 2008

You might check your radiator cap...if it doesn't allow the system to build a slight pressure 10-15psi, the coolant can boil prematurely.

I'd flush everything with a garden hose to verify flow...also a good time to refresh the coolant and replace any old hoses too.

Wayne from Wi · Nov 24, 2008

Maybe the answer is the inch long sealant you saw..... it has plugged the radiator tubes. Wayne

El Toro · Nov 24, 2008

The tubes in the radiator may need to be rodded out. I wouldn't run the tractor until you find the problem as you can damage the head and engine quickly. Any of the problems mentioned can cause it to overheat. Hal
PS: When its hot touch the bottom hose to see if it is hot. Be careful not to get burned. If it doesn't feel very warm the tubes may be plugged
restricting the coolant flow.

El Toro · Nov 24, 2008

Make sure your timing isn't off. Hal

706 Running Hot?

Anonymous-0

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farmhand

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Heat Houser

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Bob M

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Anonymous-0

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mattofvinings

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Wayne from Wi

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El Toro

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El Toro

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