4-20. RADIATOR AND COOLING SYSTEM - Continued
Fan Clutch Replacement.
Carry out steps 1 thru 4 in a. preceding.
Loosen fan pulley support block capscrews.
Loosen belt adjusting screw on top of fan pulley
support block until fan belts can be removed from
Remove fan belts from both pulleys. Slip them
over the fan clutch and remove from engine
While supporting clutch and pulley assembly,
remove capscrews retaining fan pulley support
block to engine
(6) Lower fan pulley support block and remove from
truck via left hand engine compartment.
Install fan pulley assembly in a vise. Connect an air line to the fan clutch and charge clutch to 100 psi
Rotate fan clutch until the machine screws attaching fan clutch to fan pulley are visible. Remove air
(9) Remove machine screws attaching clutch to pulley. Remove clutch but retain spacer between clutch
Install new fan clutch on pulley ensuring spacer is fitted between pulley and clutch. If necessary connect
air line to clutch assembly to allow alinement of screw heads with holes in clutch hub.
Attach using machine screws removed above. Tighten screws to 75 ft lb (100 Nm)
(12). Install fan assembly in truck against engine support bracket. Install four retaining capscrews fingertight.
Slip fan belts over fan clutch pulley and crankshaft pulley.
Tighten adjusting screw until there is 1/2 in. (1.2 cm) play in fan belt midway between the pulleys.
Tighten support bracket retaining capscrews to 75 ft lb (100 Nm).
Install fan on fan clutch and tighten nuts to 75 ft lb (100 Nm).
Coat threads of elbow with pipe sealant (item 22, Appendix E) and install in fan clutch. Reconnect air
line to clutch.