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Page Title:
Table 4-2. Engine Start-up Performance Checks (Cont) |
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 TM 55-4920-405-13&P
Engine Start-up Performance Checks - Continued
Table 4-2.
Normal
Abnormal
Corrective
Action
Indication
Indication
Step
Action
d . Adjust, repair or replace
Engine exhaust
d.
carburetor.
smokey (white).
Probable cause:
c a r b u r e t o r misad-
justed or defective.
e.
(1) Adjust carburetor.
e.
Fuel consumption
(2) Replace air cleaner.
too high. Probable
(3) Replace defective
cause:
tubing and fittings.
(1) Carburetor choke
c o n t r o l incor-
rectly adjusted.
(2) Air cleaner
clogged.
(3) Fuel leaks in
tubing or
fittings.
a.
(1) Drain crankcase and
Abnormal reading on
a. ENGINE OIL
a.
7
Let engine warm
refill with oil (table
ENGINE OIL PRES-
PRESSURE
up about 10 min-
S U R E gage. Prob-
gage (2, fig-
utes to normal
(2) Drain crankcase oil
able cause:
ure 2-1) indi-
operating
and replace oil filter.
cates between
temperature.
(1) Crankcase oil
(3) Refill crankcase
XX and ON, or
level too low.
with oil (table 3-5).
at ON.
(2) Oil filter
(3) Test and replace gage.
clogged.
(3) ENGINE OIL
PRESSURE gage
defective.
b.
(1) T e s t , adjust, and/or
b.
AMMETER reading
b. AMMETER (3,
replace.
abnormal. Prob-
figure
)
(2) Replace AMMETER.
able cause:
reads a little
to right of
(1) Defective alter-
center.
rnator. voltage
r e g u l a t o r , or
rectifier unit.
(2) Defective
AMMETER.
Remove and replace TACH-
TACHOMETER HOUR
TACHOMETER
8
Using THROTTLE
OMETER HOUR METER.
METER reads reading
HOUR METER
(3, figure 2-2),
is abnormal. Probable
(1, figure 2-1)
raise engine speed
c a u s e : defective
2000 RPM.
to 2000 RPM.
TACHOMETER HOUR
METER.
4-5
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