6-61. Lube Water Filter System Maintenance.
Install new filters every 50 hours
of engine test operation. Lube
water filter system has an alarm
that comes on when water flow
decreases to 8 gpm. When the
engine has been shut down due
to an alarm, both the METS water
system and the filter system must
corrected as necessary.
Normal water pressure is 65 to 100 psig. Clean
filters every 5 hours of operation or when filter pressure
decreases below 65 psig. Remove, clean, and replace
filter as follows:
Loosen and remove ten wingnuts from filter
assembly cover. Remove cover (see figure 7-54).
Remove 21 filter elements.
Rinse filter elements in clear water and air-dry
Install 21 filter elements.
Install cover. Install and tighten the ten
wingnuts. If cover leaks during engine operation,
retighten wingnuts as necessary.
6-62. Torque Tube Mount Rabbet Maintenance.
If inspection of torque tube mount detects nicks,
scratches, or other damage to rabbet surfaces (14,
figure 256), hand-work as necessary for proper fit to
water brake torque element.
6-63. Electric Starter Maintenance.
After every 300 starts, inspect starter commutator
and brushes as follows:
Remove brush cover and inspect commutator.
The surface must be clean (free from oil or grease),
evenly colored, and with no evidence of excessive
Brush springs shall not be burned or distorted.
Brush holder assembly shall be clean (free from
oil or grease), and connections secure with no cracked
or burned brush holders.
Brushes shall not be chipped or cracked and
they must move freely in the brush holders.
Check that allowable brush wear will not be
exceeded before the next maintenance action. Refer to
figure 618 for allowable limits. If replacement is
indicated, return starter to depot for repair.
Figure 6-18. Starter Brush Wear Groove and
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