ARMY TM 9-6115-641-24
AIR FORCE TO 35C2-3-456-12
Table 2-6. UNIT TROUBLESHOOTING - Continued.
TEST OR INSPECTION
Step 3. Check for contaminated oil.
a. If oil is contaminated, change oil, paragraph 2-88-2.
b. If oil is not contaminated notify next higher level of maintenance.
16. COOLANT IN CRANKCASE OR OIL IN COOLANT.
Check for coolant or oil contamination, If contaminated, notify next higher level of maintenance.
17. ENGINE VIBRATING.
Step 1. Check for bent or broken cooling fan blades, paragraph 2-74-1.
a. If fan blades are not damaged, do Step 2.
b. If damaged, replace cooling fan, paragraph 2-74.
Step 2. Check for contaminated or incorrect grade of fuel.
a. If fuel is not contaminated and is correct grade, do Step 3.
b. If contaminated or incorrect grade, drain fuel tank. Replace fuel filter/water separator element, para-
graph 2-87. Service fuel tank with clean fuel of proper grade (Table 2-2). Prime engine fuel system
in accordance with TM 9281525224.
Step 3. Check for loose or defective engine or engine mounts.
a. Tighten loose mounting bolts.
b. If bolts are tight or problem persists, notify next higher level of maintenance.
18. ENGINE FAILS TO START IN COLD WEATHER.
Step 1. Test for low or no battery charge, paragraph 2-12-1.
a. If batteries are fully charged, do Step 2.
b. If not fully charged, replace batteries, paragraph 2-12.
Step 2. Check for improper lubrication oil.
a. If proper lubrication oil, do Step 3.
b. If improper, drain crankcase and refill with proper lubrication oil (Table 23). Replace oil filter in ac-
cordance with TM 9-281525224.
Step 3. Check for improper grade of fuel.
a. If proper grade of fuel, do Step 4.
b. If improper, drain fuel tank. Service fuel tank with clean fuel of a proper grade (Table 2-2). Prime
engine fuel system in accordance with TM 9-2815-252-24.
Step 4. Check for defective inlet manifold heater plugs, refer to TM 9-2815-252-24.
a. If heater plugs are not defective, do Step 5.
b. If defective, replace heater plugs in accordance with TM 9-2815-252-24.