MAINTENANCE OF ENGINE
Section L DESCRIPTION AND FUNCTION
One piece, press fit oil seals are used to seal both
ends of crankshaft. A mechanical governor is used
The engine is a four cylinder, air-cooled, overhead
to regulate engine speed under varying generator
valve, fuel injected, diesel. End crankshaft and cam-
load conditions. Since the engine is direct coupled
shaft bearings are press fit one piece bearings. The
to the generator, correct engine speed will produce
center crankshaft bearing is a two piece split bear-
required generator output.
ing. Crankshaft end play is adjusted by using correct
shim between rear bearing plate and cylinder block.
Section II. ENGINE EXTERNAL ASSEMBLY
7-2. FUEL LINES.
a. Removal. On ASK equipped generators, refer to Operator and
Organizational Maintenance Manual and remove right panel assembly.
Tag and remove injector nozzle return line (3, figure 7-1). Remove
manifold (4) and return line (5). Tag and remove injector lines (7).
b. Inspection. Inspect lines and fittings for thread
damage and breaks which might cause leaks.
c. Installation. Remove plugs or tape from lines and fittings.
Contaminated lines and fittings should be rinsed with clean fuel oil
before installation. Install injector lines (7, figure 7-1) between injector
pump (1) and injector nozzles (2). Remove tags. Install return line (5)
and manifold (4). Install fittings (6) on injector nozzles (2) and install
return lines (3) between fittings (6) and manifold (4). Remove tags.
For torque information on fuel line fittings see Table 9-1 . On ASK
equipped generators, refer to Operator and Organizational Mainten-
ance Manual and replace right panel assembly.
a. Inspect (see figure 7-2). On ASK equipped generators, refer to
Operator and Organizational Maintenance Manual and remove right
panel assembly. Inspect governor linkage and springs for physical
damage, binding or excessive slack or wear. Check that linkage is
clean and free of dirt, grease, or oil or other obstructions. Check that
governor linkage moves freely. Check ball joints for smooth but not
b. Test. Operate engine until it reaches normal
temperature. Check frequency meter.
Frequency meter should indicate rated frequency
with no load. Apply full load to unit. Governor
should adjust engine speed to equal rated frequency
without hunting (alternate increasing and decreasing
of speed). Adjust engine sensitivity if necessary as
(1) Low Speed Adjustment. Adjust low speed
(1600 RPM MEP-003A or 1778 RPM MEP-112A) by
repositioning the control nut (7, figure 7-2) at the
attaching bracket located inside the engine access
door. The control knob should be pushed fully in be-
fore making the low speed adjustment. This reduces
tension on the spring (17) permitting governor arm
(3) to move the injector pump (2) to lower fuel posi-
tion reducing engine speed.
(2) High Speed Adjustment. Adjust high speed
(2000 RPM for MEP-003A) (2200 RPM for MEP-
112A) by setting the maximum speed screw (18),
located at the front of the engine (clockwise de-
creases speed, counterclockwise increases speed)
with the control knob pulled fully out.
(3) Sensitivity Adjustment. Adjust governor sen-
sitivity (no load to full load speed droop) by turning
the sensitivity adjusting ratchet (16) counterclockwise
(lower spring) for more sensitivity (less speed droop
when full load is applied) or clockwise (raise spring)
for less sensitivity (more speed droop when full load
is applied). If the governor is too sensitive, a rapid
hunting condition occurs (alternate increasing and de-
creasing of speed). Adjust for maximum sensitivity
d. Remove. Disconnect governor linkage (1) from
injector pump (2) and governor arm (3). Remove
governor arm (3) from governor shaft (4). Remove
cotter pin (5) and pin (6). Loosen nuts (7) and (8).
Remove clamp (10). Remove speed control cable (11).
Remove control bracket (12) from engine back plate
by removing screw (13), lockwasher (14) and nut (15).