BOLT 4H6143 - Caterpillar

Remove & Install Water Temperature Regulator
FLUID SPILLAGE CONTAINMENT Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to "TOOLS AND SHOP PRODUCT GUIDE, NENG2500", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose fluids according to local regulations and mandates.1. Drain the coolant from the cooling system below the level of the water temperature regulator into a suitable container for storage or disposal. 2. Disconnect the hose from pipe (1).3. Remove four bolts and pipe (1) from the cylinder head. Remove gasket (2) and water temperature regulator (3). The following steps are for the installation of the water temperature regulator.
If the water temperature regulator is installed wrong, it will cause the engine to overheat. Make sure the vent hole is open and do not use liquid gasket material on the gasket. The cylinder head can be damaged if the vent hole is not open or if the gasket is installed wrong.
4. Install water temperature regulator (3) and gasket (2) as shown.5. Put pipe (1) in position on the cylinder head, with the plug toward the front of the engine. Install the bolts that hold it.6. Connect the radiator hose to pipe (1) and fill the radiator with coolant to the correct level. See the Operation & Maintenance Manual.