TM 55-2840-241-23
Table 4-1. Troubleshooting (Continued)
Item
Trouble
Probable Cause
Remedy
Contaminated oil or
oil cooler mal-
function.
16 ENGINE OIL TEMPER-
a. Drain and refill engine oil system.
ATURE EXCEEDS 225°
F (107°C) but remains less
than 248°F (120°C) for a
period not exceeding ten
minutes WITHOUT ANY
CHANGE IN NORMAL
OIL PRESSURE.
17 IF ENGINE OIL TEM-
PERATURE EXCEEDS
225°F (107°C) but remains
less than 248°F (120°C) for
a period not exceeding 10
minutes WITH A CHANGE
IN NORMAL OIL
PRESSURE.
Contaminated oil or
oil cooler malfunction.
b. Inspect the magnetic drain plugs.
c. Inspect oil filter and clean or re-
place as required.
d. Check for carbon deposits (coking).
e. Ground run engine for ten minutes.
Obtain as high a power level as pos-
sible without lift-off (without exceed-
ing maximum continuous rating).
f. Reinspect the magnetic drain plugs.
If the magnetic drain plugs are free of
particles, reinspect after five hours of
operation.
g. If carbon particles are found, re-
peat the maintenance procedure.
a. Do not attempt to adjust the oil
pressure regulating valve setting, re-
place the oil filter housing assembly.
(Refer to paragraph 5-27.)
b. Inspect and replace the oil filter.
Check for carbon deposits (coking).
c. Drain and refill engine oil system.
d. Inspect magnetic drain plugs.
e. Start engine and check oil pressure
at 78.2% N1 speed or above; if pres-
ssure is not within 90 to 130 psig, ad-
just oil pressure regulator valve as re-
quired.
f. If correct oil pressure is obtained,
perform steps d and e under ENGINE
OIL TEMPERATURE EXCEEDS
225°F (107°C) WITHOUT ANY
CHANGE IN NORMAL OIL
PRESSURE.
g. If correct oil pressure cannot be
obtained by regulator valve adjust-
ment, replace engine. (Refer to TM
55-1520-228-23.)
4-7
