Re: Running engine without thermostat

Posted by buickanddeere on March 26, 2005 at 11:31:12 from (64.10.41.16):

In Reply to: Running engine without thermostat posted by Willy P on March 25, 2005 at 18:59:25:

There is reasoning out there that goes something like this." too hot and boiling is bad...so colder must be better."

The problem with most diesels is they run too cold, not too hot. At light load or idle the thermostat is fully closed and the engine never reaches 180 to 195F required.
A full charge of air is always drawn into a diesel. At idle/light loads the wee bit of fuel injected just makes a little pssst of flame in the middle of the combustion chamber. Most of that air drwn in isn't used in the combustion process. It just picks up heat from the engine and carries it out the stack. Cooling the engine.
Same problem with oil,wood,coal and gas burners etc. Mr. Tinkers think some air is good, more is better. So they open the air intake all the way adding the max amount cold unused air. Overall efficiency has just been dropped. You are burning more fuel in the long run to draw more cold air into the house, heat the air and blow the unused air out the stack.

At 180-195 the cylinder wall, ring and piston wear is reduced. Cold cylinder walls condense unburned fuel on themsleves. And dilute that thin layer of lube oil in the pores of the metal causing accelerated wear.
Cold temps also fill and stick rings/lands with carbon/soot. Along with the previously stated port/combustion/valve deposites and "wet stacking."
Put that tractor on a pto generator or something and begin measuring the coolant temp entering the rad before warmed up and under pressure. I suspect your IH rarely reaches proper operating temps with the stat.

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