Table 2-2. Generator Set Troubleshooting (Cont)
Malfunction
6.
7.
8.
9.
10.
Engine runs but fails to
reach rated speed.
(Continued)
Low oil pressure
High oil pressure
Engine lubricating oil
consumption high
Engine noisy
Probable cause
b.
Lack of fuel.
c.
Defective fuel in-
jection pump.
a.
Defective oil pump.
b.
Worn main bearing.
c.
Defective oil regu-
lating valve (oil
pressure below 45
psi).
Defective oil regulating
valve. (oil pressure
above 45 psi)
a.
—
b.
c.
a.
b.
c.
d.
e.
f.
g.
h.
Pistons, sleeves or
rings worn or
defective.
Main bearings worn.
Oil leaks at crank-
shaft seals
Main bearings worn.
Connecting rod
bearings worn.
Piston pins loose.
Piston or rings
broken.
Timing gears worn.
Crankshaft journals
eccentric or out of
round.
Connecting rods
miss.lined.
Incorrect valve
adjustment,
Corrective action
c.
—
a.
—
b.
—
c.
—
b. Check fuel level. Replenish if
necessary. (Operator and organ-
izational maintenance manual).
Inspect fuel injection pump. Re-
pair or replace as required
(para 14-44 and 14-45).
Replace oil pump (para 14-65
thru 14-67).
Replace main bearings (para
14-85 thru 14-87).
Replace defective valve in
cylinder block (para 14-78
and 14-87).
Replace defective valve in cylinder
block (para 14-78 and 14-87).
a.
—
b.
—
c.
—
a.
—
b.
—
c.
—
d.
—
e.
Replace pistons and rings (para.
14-81 thru 14-83). Replace
cylinder sleeve (para 14-85
thru 14-87).
Replace main bearings (para
14-85 thru 14-87).
Replace seal (para 14-85 thru
14-87).
Replace if required (para 14-85
thru 14-87).
Replace if required (para 14-81
thru 14-83).
Replace the piston or rings
(para 14-81 thru 14-83),
Replace pistons or rings
(para 14-81 thru 14-83).
Inspect gear fit and replace
gears if required (para 14-72
thru 14-74).
f. Inspect crankshaft and repair
or replace (para 14-85 thru 14-
87).
g. Realine connecting rods (para
14-82).
h. Check valve adjustment.
Adjust valves (Operator and
Organizationl Maintenance
Manual).
2-12
