26. OVERHEATS

TM 9-2320-289-34 Table 2-1. Mechanical Troubleshooting (Con’t) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION step 4. Drain cooling system. (See TM 9-2320-289-20) Remove engine mounts. (See paragraph 3-3) Remove starter. (See TM 9-2320-289-20) Inspect 2 oil galley plugs at front of engine block and 7 oil galley plugs at rear of engine block. Oil galley plugs should be flush with engine block. If oil galley plugs are damaged or recessed in engine block, cut slot in oil galley plug with chisel, pry out, and discard. Apply sealant (Item 56, Appendix B) to new oil galley plug, and using oil galley plug installer, drive into engine block until flush. If oil galley plugs protrude from engine block, drive into engine block until flush using oil galley plug installer. 26. OVERHEATS Step 1. Step 2. Step 3. Step 4. Step 5. Step 6. Attempt to spin fan and fan clutch by hand. If fan and fan clutch revolve more than five times without drag, replace fan clutch. (See TM 9-2320-289-20) Visually check to see if lateral movement of fan, as measured at fan blade, exceeds approximately 0.25 in. (6.35 mm). If lateral movement exceeds approximately 0.25 in. (6,35 mm), replace fan clutch. (See TM 9-2320-289-20) Check for silicone fluid leakage around fan clutch bearing assembly. Small leakage will not normally affect operation. If silicone fluid leakage appears excessive, replace fan clutch. (See TM 9-2320-289-20) Start engine, allow to reach operating temperature, then shut off, Carefully feel radiator from right side to left side. Radiator should be warm on right side and hot on left side, with an even temperature rise from right to left. Cold spots indicate restrictions. Repair or replace radiator if there are any restrictions. (See TM 9-2320-289-20 and TM 750-254) Start engine and check for leakage from water pump and water pump plate. If leakage is evident, replace water pump. (See paragraph 3-48) Inspect each cylinder head gasket for leakage. If there is leakage, remove and inspect cylinder head. (See paragraph 3-7) If cylinder head does not require replacement, replace cylinder head gasket and install cylinder head. 2-20