MAINTENANCE OF THE M88A1 - OD1672 - LESSON 2/TASK 1
(a) Removal of Defective Fan.
Step 1. Remove the four screws and four washers (figure 21, view A, on the
previous page) that secure the fan housing to the cooling fan baffle.
Remove the fan housing from the fan baffle.
Step 3. Remove the two cotter pins, two nuts, and two flatwashers (figure
21, view B) that secure the defective fan hub to the splined vertical fan
Remove the assembled fan and hub from the splined vertical fan
(b) Installation of Serviceable Fan.
Install assembled fan and hub on the splined vertical fan shaft.
Step 2. Install a serviceable flat washer and nut on the splined vertical
fan shaft. Using a torque wrench, torque the nut to 600 lb-in. Align one
of the slots on the nut with the hole in the shaft, and install a new cotter
Step 3. Using a feeler gage, check the clearance between the tip of each
fan blade and the rim of the fan baffle. The clearance between the tip of
the fan blades and the rim of the fan baffle should be within 0.062 inch all
If it is not, loosen the housing mounting screws and shift the
housing as necessary to obtain this clearance.
Position the fan housing on the fan baffle and attach the
serviceable four screws and four lockwashers securing the housing to the
baffle. After installation, the fan clutch release torque must be checked.
Using a pull-type scale, check the release torque of the cooling fans
The fan clutch should release at approximately 20 pounds pull.
Upon completion of installation of serviceable fans, the engine deck should
then be reinstalled.
Listed below is an example of the correct procedure unit
personnel would follow in troubleshooting, maintenance, adjustment, and
repair of this system, specifically: ENGINE STARTS RUNNING BUT FAILS TO STAY