The double-ended spanner wrench fits the holes in pressed-on water pump pulleys. Hold the pulley firm with the spanner wrench. Use the appropriate open end wrench to turn the fan clutch nut (41740 36mm turning wrench works on many applications).
Lisle 43340 Fan Clutch Wrench- 2 1/8"
Fan Clutch Spanner Wrench - Lisle Tool Corporation Prt# 44180
Lisle 43350 Pneumatic Fan Clutch Wrench Set, 10 pc
Lisle 43350 Pneumatic Fan Clutch Wrench Set, 10 pc Free Shipping US
Lisle 43340 2 18 Fan Clutch Wrench
Lisle 43300 Pneumatic Fan Clutch Wrench