09130-07440 GOVERNOR ASSY, MEC Denso Cross

Cooling System
Do not perform this maintenance until you read and understand the material in the Safety and Cooling System Specifications sections of this publication.This procedure is to be used for normal maintenance of cooling system surfaces to return to "like new" condition. For heavy build-up of scale and deposits, a severe acid-type commercial cleaner or mechanical cleaning will be required.
Refer to the Cooling System Specifications for additional information regarding appropriate Flush/Fill for your application.Clean/Flush Coolant
If changing thermostats prior to this interval, go to step 5, Replace Thermostat, Gaskets and Seal.1. Stop the engine and allow to cool. Loosen the radiator filler cap slowly to relieve any pressure and remove the cap.2. Remove the cooling system drain plug(s) or open the drain valve and allow the coolant to drain. Open the cab heater valve to flush coolant from the cab heater. 3. Remove the drain plug (1) on bottom of water pump housing and/or radiator. Remove the cylinder head drain plug from the engine. Allow coolant to drain.Water Pump Seal
Over concentration of coolant additive (Conditioner), mineral deposits from hard water or cooling system contamination can accelerate the wear on the water pump coolant seal. The cooling system maintenance interval provides an opportunity to inspect and replace the water pump seal if necessary to reduce coolant leakage.Dispose of used engine coolant or recycle. Various methods have been proposed to reclaim used coolant for reuse in engine cooling systems. The full distillation procedure is the only method acceptable by Caterpillar to reclaim the used coolant.Contact Caterpillar Service Technology Group:
Outside Illinois: 1-800-542-TOOL
Inside Illinois: 1-800-541-TOOL
Canada: 1-800-523-TOOL
Refer to Service Magazine article dated November 13, 1989 and/or Engine News article dated November 1989 for information regarding disposal and recycling of used coolant.4. Clean and install all drain plugs and/or close drain valve. All tools shown or mentioned in the following Disassembly and Assembly procedure are available at any Caterpillar dealer.Replace Thermostat, Gaskets and Seal
If replacing thermostats ONLY, drain the coolant from the cooling system to a level below the thermostat housing. 5. Loosen the hose clamps and remove the radiator hose from the thermostat housing.6. Remove the thermostat and gasket from the thermostat housing. The thermostats can be reused if they are tested and meet the test specifications below and are not damaged or have excessive buildup of deposits. Thermostats should begin to open and be fully open as indicated in the following chart. Install Thermostat
Caterpillar engines incorporate a shunt design cooling system and require operating the engine with a thermostat installed.
Inspect gaskets before assembly and replace if worn or damaged. 7. Install a new thermostat in the thermostat housing. 8. Install a new gasket and the water outlet pipe on the thermostat housing.9. Install the radiator hose and tighten the hose clamps.
Use of commercially available cooling system cleaners may cause damage to aluminum cooling system components. Use only cooling system cleaners that are approved for engines that have aluminum cooling system and engine components.DO NOT use a cooling system cleaner that contains tri-sodium phosphate;