3-91. INSPECT WATER PUMP AND IDLER PULLEY COMPONENTS
a. Inspect bearing for rough or worn races Discard bearing if defective.
b. Check impeller for cracks of erosion. Replace if defective.
c. Measure impeller bore for maximum diameter of 0.625 in. (15.875 mm).
Replace if diameter greater than
d. Measure shaft diameter at impeller end. Replace shaft if diameter less than 0.6262 in. (15.9054 mm).
e. Compare impeller inside diameter to shaft outside diameter. There must be a minimum of 0.001 in. (0.025 mm)
press fit between impeller and shaft. Replace components necessary to gain required fit.
f. Measure water pump pulley inside diameter and shaft outside diameter at pulley end. There must be a minimum
of 0.001 in. (0.025 mm) press fit between impeller and shaft. Replace components necessary to gain required fit.
g. Inspect shaft for straightness and galling at bearing surfaces. Replace if bent or galled.
h. Inspect pulley grooves for wear, chips or cracks. Check belts' seating with new belt. Belts should not bottom in
grooves and not protrude more than 1/8 in. (3.175 mm) above grooves.
i. Measure idler puller bore and idler shaft outside diameter. There must be minimum of 0.001 in. (0.025 mm) press
fit between shaft and pulley. Replace components necessary to gain required fit.
j. Inspect wear sleeve on pulley. If grooves found, replace sleeve:
(1) Grind 15 angle on end of 3/16 in. (4.762 mm) straight shaft punch.
(2) Secure pulley in vise with front face up.
(3) Drive wear sleeve from pulley hub by placing punch through puller holes in pulley. Discard sleeve.
(4) Press new wear sleeve on until it is flush with end of hub.