TM 5-3805-254-20.1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6.
ENGINE TACHOMETER DOES NOT WORK.
Step 1.
Using 1-inch open-end wrench, unscrew and take tachometer cable (1) off cable adapter (2) on fuel pump
(3). Have assistant start engine (TM 5-3805-254-10). Look into cable adapter (2) and see if cable drive (4)
is turning. Have assistant shut down engine (TM 5-3805-254-10).
a.
If cable drive (4) is not turning, notify Direct Support Maintenance.
b.
If cable drive (4) is turning, screw tachometer cable (1) onto cable adapter (2) and tighten using 1-
inch open-end wrench. Go to step 2.
Step 2.
Open lower center instrument panel (page 2-424). Using 3/4-inch open-end wrench, unscrew and take
tachometer cable (1) off tachometer head (5). Start engine (TM 5-3805-254-10) and see if cable core (6) is
turning. Shut down engine (TM 5-3805-254-10).
a.
If cable core (6) is not turning, replace tachometer drive cable (1) (page 2-1420).
b.
If cable core (6) is turning, replace tachometer head (5) (page 2-1411).
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