Ford 7610 running hot

[searcyfarms]

first, how long have you had this tractor and have you always been using the same bhog and mowing the same area at the same time of year with the same height and in the same gear in the same temps etc.............there are so many variables outside of this cap we need to get this identified

something has obviously changed and a radiator cap loose or sealed wouldn't cause overheating all by itself

when was the last time you washed out the radiator front/back to get all the seeds/weeds/leaves/grasshoppers/junk in the fins of the radiator - how about the fan belt is it turning good, anything that might have changed with fan - belt get antifreeze/oil on it and it wont turn good?

I think there is something else going on here not just a radiator cap.

 

[Jerry/MT]

Possible causes:

Most Likely:

Failed closed thermostat, clogged air side of radiator, clogged coolant passages in radiator, loose fan belt, eroded water pump impeller, collapsed lower rad hose at off-idle engine rpm, failed rad cap (you replaced that), clogged air filter.

Less probable- excessive load on tractor (not likely since you are hogging), excess fuel in cylinders (leaking injectors failure in IP), bad gauge.


Check these out systematically and you should find the problem

 

[Texasmark]

I've seen the 13# in related tractor manuals. Published data says that compressing the fluid increases not only the boiling point but also improves circulation....not sure of the mechanism here but it's in published data.

On Heat, get out your Harbor Freight Non-Contact Infrared thermometer ($20-30 bucks depending on if sale price or normal). Check your thermostat tem at the right front of the head, just behind the radiator fan (air blast) shield for a reasonable number below 195F....dependent on the T stat temp installed....my 188 stat runs around 195 after working. Then drop down on the left side and read the bottom radiator tank temp. Mine runs around 105-110 after running.

If the top is hot and the bottom of the radiator is cool, problem in the engine. If top is above average and bottom is hot also, clogged radiator, internally or externally.

That's how I would look at it.

 

[Texasmark]

The higher pressure tends to reduce or eliminate cavitation.
This becomes more of a problem as RPM increases.

Makes sense. Since air compresses, bubbles get smaller and have less effect. Thanks.

 

[CincyFlyer]

Makes sense. Since air compresses, bubbles get smaller and have less effect. Thanks.

Remember that cavitation bubbles don't contain air! They start out as a vacuum void and the may be filled with (in this case) coolant that has vaporized.

 

[Texasmark]

Remember that cavitation bubbles don't contain air! They start out as a vacuum void and the may be filled with (in this case) coolant that has vaporized.

Vapor of any kind has wide separation between molecules, allowing for compression once you overcome the static resistance of the medium.