Disassembly/Inspection and Service Remove Oil Sentry (if equipped) Disconnect wire lead from Oil Sentry switch, and remove switch from breather cover. 1. Remove front nut and washer securing fan assembly to fan shaft. Remove fan and pulley assembly from upper mounting bracket. 2. Remove screws and take off mounting bracket, with fan shaft attached. 3. Fan shaft may be removed from mounting bracket, by removing rear nut, if individual servicing of either part is required. Inspection and Service Cooling fan assembly consists of a fan attached to a v-pulley and bearing carrier (hub), rotating on a dual ball-bearing fan shaft (arbor).
Assembly is mounted with a bracket to intake manifold and driven via a split pulley off fl ywheel. Inspect components carefully for signs of wear or damage. 1. Inspect fan to make sure blades are in good condition and free of any cracks, nicks, or damage. Area around fan mounting holes must also be free of any cracks or damage. 2. Fan and hub assembly, when mounted to center arbor shaft , must rotate smoothly without noticeable bearing play, wobble, or binding. 3. Check v-belt for excessive wear, cracking or damage. If proper belt tension cannot be obtained, or condition of belt is suspect; replace it with Kohler Part No. 66 203 02-S. Do not use a substitute belt. Remove Breather Cover 1.
Remove screws securing breather cover to crankcase. 2. Carefully pry under protruding edge of breather cover to separate and remove cover from gasket. Do not pry on sealing surfaces as it could cause damage resulting in leaks. 3. Remove breather gasket and fi ber fi lter from breather chamber. 4. Remove screw, breather reed retainer and breather reed from breather chamber. Remove Lower Drive Pulley and Fan Belt 1. Remove four screws attaching lower drive pulley assembly to pulley adapter and fl ywheel. 2. Remove pulley halves with spacer shims from adapter, and take fan belt off upper pulley/fan assembly.
Note number of shims between pulley halves, and on front side of pulley, especially if same belt will be reinstalled. Remove Fan Assembly, Mounting Bracket, and Fan Shaft NOTE: Further disassembly of fan/hub and pulley assembly is not necessary unless a problem exists; see. If disassembly is performed, note assembly order and position of parts. 46 KohlerEngines.com 66 690 01 Rev. C