Fan Installation; Tempatrol Fan Test; Dynamic Test - Jeep 1987 Wrangler Workshop Manual

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S E E
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FAN INSTALLATION
Position the fan shroud, if equipped.
Install the fan attaching nuts and tighten.
Install the belt(s) and tighten to the specified
tension. Refer to Drive Belt Adjustments.
Install the shroud attaching screws and tighten,
if removed.
Tempatrol Fan Test
In an engine overheating situation, the
Tempatrol drive unit can be statically tested for
proper operation by observing the movement of
the bimetallic spring coil and shaft.
To test, disconnect the end of the bimetallic
spring coil (1) from the slot and rotate it
counterclockwise until a stop is felt.
NOTE: Do not force beyond the stop.
84620
The gap between the end of the coil and the clip
on the housing should be approximately 13mm
(1/2~in). Replace the unit if the shaft does not
rotate with the coil. After testing, connect the end
of the coil in the slot.
Dynamic Test
CAUTION: Ensure there is adequate fan blade
clearance before drilling.
Drill 3.18mm (1/8-in) diameter hole in the top
center of the fan shroud.
CAUTION: Ensure there is adequate clearance
from the fan blades.
Insert a dial thermometer, - 1 8 ° C - 1 0 5 ° C (0°F -
2 2 0 ° F ) with a 20mm (8-in) stem, or equivalent,
through the hole in the shroud.
Connect a tachometer and ignition timing light
(to be used as strobe light). Refer to Ignition
System Timing procedures.
Block the air flow through the radiator by
securing a sheet of plastic in front of the radiator
(or air conditioner condenser). Use tape at the
top to secure the plastic and ensure the air flow
is blocked.
NOTE: Ensure the air conditioner, if equipped,
is turned off.
CAUTION: The cooling system must be in good
condition prior to performing the test to ensure
against excessively high coolant temperature.
WARNING: Use extreme caution when the
engine is operating. Do not stand in a direct line
with the fan. Do not put your hands near the
pulleys, belts or fan. Do not wear loose clothing.
B-178

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