TM 5-3805-255-14
0038
TESTING
00038
NOTE
Excessive fan slippage can cause problems in the cooling system such as the engine
overheating. Use this procedure to check fan slip clutch torque on the engine.
Checking Fan Clutch Slip Torque on Engine
00038
NOTE
Use torque adaptor for proper testing.
1. Remove eight nuts (Figure 4, Item 5), 16 washers (Figure 4, Item 4), eight bolts (Figure 4, Item 7), and fan
Figure 4, Item 1) from fan mounting assembly (Figure 4, Item 3).
2. Use two 3/8 x 3-3/8 in. UNC grade 8 bolts (Figure 4, Item 7) and nuts (Figure 4, Item 5) to install pre-fabricated
torque adapter (WP 0125) on fan mounting assembly (Figure 4, Item 3).
CAUTION
Make sure torque adapter bolts DO NOT touch pulley after mounting. Failure to follow this
caution may result in damage to equipment.
3. Hold 1-3/4 in. nut on crankshaft pulley (Figure 4, Item 6) to keep stationary.
CAUTION
Rotate torque adaptor in clockwise direction only. Failure to follow caution may result in
damage to equipment.
NOTE
Break clutch loose five times to seat friction plates before recording torque value. Torque
should be 160 to 300 lb-ft (712 to 1,334 Nm). If clutch torque is not within specification,
notify Sustainment Maintenance.
4. Prevent crankshaft pulley (Figure 4, Item 6) from rotating while checking fan mounting assembly (Figure 4,
Item 3) clutch slippage. Use a torque wrench on torque adaptor (Figure 4, Item 2) and rotate fan mounting
assembly (Figure 4, Item 3) clockwise. Note torque value when fan mounting assembly clutch slips or breaks
away. Torque should be 160 to 300 lb-ft (712 to 1,334 Nm).
0038-6
