Place thermometer in container but do not allow it to touch bottom.
Heat and agitate water to maintain an even temperature throughout container. As the water is heated,
thermostat valve should begin to open when temperature is 167° to 172°F. Thermostat valve should be fully open at
190° to 192°F.
Discard and replace a defective thermostat.
Check to make sure bleed hole in thermostat housing is open.
Use a new housing gasket and install thermostat in reverse of disassembly sequence.
Service cooling system.
4-9. Engine Fan Guard
Removal. Remove fan guard by removing bolts and lockwashers that mate fan guard to radiator shell.
Cleaning, Inspection and Repair.
Clean fan guard with cleaning solvent and dry thoroughly.
Inspect fan guard for cracks, breaks, or other damage.
Inspect mounting hardware for damaged threads.
Repair by replacement of defective parts.
Installation. Install engine fan guard in reverse of disassembly sequence.
4-10. Alternator Fan Drive Belts
Remove engine fan guard (Para 4-9).
Loosen fan adjusting bolts (Fig. 3-5) and remove two fan drive belts.
Loosen alternator adjusting screw.
Always replace alternator fan drive belts in complete sets when one is worn. Single belts of similar
size must not be used as a substitute for a matched belt set.
With adjusting bolts loose, install the set of matched fan drive belts.
Adjust drive belts.
Install engine fan guard, (Para 4-9).
4-11. Battery. Remove and replace as required, (Para 4-2).