TM-9-2815-200-35
ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)
TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
TM-9-2815-200-35 - Page 462 of 779
counter reading at each 200 rprn incremen t
increase, beginning at 600 rpm and continu e
through to 2600 rpm .
(m) Reduce speed to 600 rpm and re -
check counter reading. If this reading does no t
check with the original repeat the test. Check the
readings taken at each 200 rpm increase agains t
similar points on the approved advance uni t
curve, figure 6-200. If the recorded advanc e
readings fall within the prescribed limits on the
curve ,
the test is complete. If the advanc e
readings do not meet the curve limits, proceed
with step (p) below .
(n) Turn speed regulator control to zero
(0), figure 6-199b, to reduce speed and counte r
switch, motor switch, and master switch handle
to th e “OFF” position .
Note.
Injector pump advance assembl y
will be hot following test. Operator should wea r
gloves when removing unit from test stand .
(o) Loosen fasteners and remove cover .
Remove bearing caps and remove unit fro m
bench. Remove oil transfer shaft. Place injecto r
advance pump assembly on oil drain tray wit h
small gear end up. Place advance assembly in a
clean dirt-free container, preferably
a
polyethylene bag, for storage after draining and
cooling .
Figure 6-200. Fuel injector advance unit curve .
(p) Repeats steps (h) through (m) t o
check previous readings. If advance assembl y
fails to pass the test, it must be adjusted. Note
whether advance assembly advances too soon o r
too late. Either condition can normally b e
corrected by rotating the advance flyweigh t
adjusting ring .
Note.
The advance assembly should b e
retarded slightly if the advance varies more than
2 degrees at 300 rpm when the oil pressure drain
button is depressed. This variance indicates the
mechanical retard stop is not in phase with the
hydraulic valve .
(r) Push speed control stop switch t o
disengage eddy current clutch. Turn counter ,
motor, and motor starter off .
(s) Loosen fasteners and remove cover .
Remove two cotter pins, and loosen the tw o
slotted nuts enough to permit adjusting rin g
rotation. See figure 6-201 .
Note.
Do not turn the adjusting ring more
than 1 / 16 of an inch during any one ad -
justment .
6-16 8
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