Engine Cooling System – Inspect and adjust



Tractor diesel engine has a pressure type cooling system. A pressure type cooling system gives two advantages:
• The pressure type cooling system can operate safely at a higher temperature than the boiling point of water at a range of atmospheric pressures.
• The pressure type cooling system prevents cavitation in the water pump.
Cavitation is the sudden generation of low pressure bubbles in liquids by mechanical forces. The generation of an air or steam pocket is much more difficult in a pressure type cooling system. Regular inspections of the cooling system should be made in order to identify problems before damage can occur. Visually inspect the cooling system before tests are made with the test equipment.

Visual Inspection Of The Cooling System

Check the coolant level in the cooling system.
Look for leaks in the system. A small amount of coolant leakage across the surface of the water pump seals is normal. This leakage is required in order to provide lubrication for this type of seal. A hole is provided in the water pump housing in order to allow this coolant/seal lubricant to drain from the pump housing. Intermittent leakage of small amounts of coolant from this hole is not an indication of water pump seal failure.
Inspect the radiator for bent fins and other restriction to the flow of air through the radiator.
Inspect the drive belt for the fan. Inspect the blades of the fan for damage.
Look for air or combustion gas in the cooling system.
Inspect the radiator cap for damage. The sealing surface must be clean.
Look for large amounts of dirt in the radiator core. Look for large amounts of dirt on the engine. Shrouds that are loose or missing cause poor air flow for cooling.

Engine Oil Cooler Inspect

Low Mounted Filter

(1) Oil cooler (2) Long setscrew (3) Short setscrew (4) Joint (5) Setscrews (6) Housing for the oil cooler (7) Joint

Perform the following procedure in order to inspect the engine oil cooler with the lowmounted filter:
Place a container under the oil cooler in order to collect any engine oil or coolant that drains from the oil cooler. Removal the engine oil cooler.
Thoroughly clean the oil cooler (1) and the cylinder block.
Inspect the oil cooler (1) for cracks and dents. Replace the oil cooler (1) if cracks or dents exist. Ensure that no restrictions for the flow of lubricating oil exist in the oil cooler (1). Dry the oil cooler (1) with low pressure air. Flush the inside of the oil cooler (1) with clean lubricating oil.
Install the engine oil cooler.
Ensure that the cooling system of the engine is filled to the correct level. Operate the engine. Check for oil or coolant leakage.

High Mounted Filter

(1) Oil cooler (2) Joint (3) Housing for the oil cooler (4) Nut (5) Long setscrew (6) Setscrew (7) Joint

Perform the following procedure in order to inspect the engine oil cooler with the low mounted filter:
Place a container under the oil cooler in order to collect any engine oil or coolant that drains from the oil cooler. Removal the engine oil cooler.
Thoroughly clean the oil cooler (1) and the cylinder block.
Inspect the oil cooler (1) for cracks and dents. Replace the oil cooler (1) if cracks or dents exist. Ensure that no restrictions for the flow of lubricating oil exist in the oil cooler (1). Dry the oil cooler (1) with low pressure air. Flush the inside of the oil cooler (1) with clean lubricating oil.
Install the engine oil cooler.
Ensure that the cooling system of the engine is filled to the correct level. Operate the engine. Check for oil or coolant leakage.

Water Temperature Regulator

Remove the water temperature regulator from the engine.
Heat water in a pan until the temperature of the water is equal to the fully open temperature of the water temperature regulator.  Stir the water in the pan. This will distribute the temperature throughout the pan.
Hang the water temperature regulator in the pan of water. The water temperature regulator must be below the surface of the water. The water temperature regulator must be away from the sides and the bottom of the pan. Keep the water at the correct temperature for ten minutes.
After ten minutes, remove the water temperature regulator. Immediately measure the opening of the water temperature regulator.  If the distance is less than the amount listed in the manual, replace the water temperature regulator.

Water Pump Inspect

Inspect the water pump for leaks at vent hole. The water pump seal is lubricated by coolant in the cooling system. It is normal for a small amount of leakage to occur as the engine cools down and the parts contract.
Inspect the water pump shaft for unusual noise, excessive looseness and/or vibration of the bearings.