TM55-2840-251-23
Section X ENGINE TESTING (Continued )
1-95
GROUND TESTING OF ENGINE ON
MOBILE TRAILER ASSEMBLY
(AVIM) (Cont)
2.f.
(Cont)
(6)
On run down, check operation of dump
valve and combustor drain valves (open). Listen for
evidence of any unusual noise, such as scraping, rubbing
or grinding. Determine source and correct as required.
Note and record run-down time.
(7)
Clear engine ( sub- paragraph g).
(8)
Check oil level and replenish tank as
necessary (Section VIII).
g.
Clear engine of trapped fuel or vapors as
follows:
(1)
Position DC switch to on position,
ignition switch to off position and test stand master switch
to on position.
(2)
Fuel shut-off lever to off position.
(3)
Test cell fuel system and fuel booster
pump switches on position.
(4)
Starter switch to on position, and motor
engine for ten seconds.
(5)
All switches to off position.
3.
Check No. 2 - Engine Start.
a.
To insure a satisfactory engine start, carry out
the following instructions in their sequence:
(1)
Position DC switch to on position.
Position test cell MASTER SWITCH to on position.
(2)
Test stand fuel system and fuel booster
pump switch to on position.
(3)
Fuel shut-off lever to off position.
(4)
Move power control master hydronic
control lever to idle position.
(5)
Position W/B PUMP and W/B AIR
switches to on position. Position chip detector switch to on
position.
CAUTION
Energize W/B AIR switch when water brake water-in
pressure reaches 30 psi.
(6)
Place engine starter, ignition and timer
start switches to on position simultaneously and check for
oil pressure rise.
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