MAINTENANCE OF ENGINE
Section I. DESCRIPTION AND FUNCTION
by using correct shim between rear bearing plate and cylin-
der block. One piece, press fit oil seals are used to seal both ends
of crankshaft. A mechanical governor is used to regulate engine
The engine is a two cylinder, air-cooled, overhead valve, fuel
speed under varying generator load conditions. Since the
injected, diesel. End crankshaft and camshaft bearings are
engine is direct coupled to the generator, 1800 RPM engine
press fit one piece bearings. Crankshaft end play is adjusted
speed produces 60 Hz generator output.
Section II. ENGINE EXTERNAL ASSEMBLY
7-2. FUEL LINES.
Cap, plug, or tape all fuel lines and fittings as well as
injector and pump openings to keep dirt from enter-
ing fuel system.
a. Removal. On ASK equipped generators, refer to Operator and
Organizational Maintenance Manual and remove right panel assem-
bly. Tag and remove injector nozzle return lines (3, figure 7-1).
Remove manifold (4) and return line (5). Tag and remove injector
b. Inspection. Inspect lines and fittings for thread damage
and breaks which might cause leaks.
For Torque information on fuel line fittings
see Table 1-1.
c. Installation. Remove plugs or tape from lines and ftitings.
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,
On ASK equipped generators, refer to Operator and Organizational
Maintenance Manual and replace right panel assembly.
7-3. EXTERNAL GOVERNOR PARTS AND SPEED
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 loose fits.
b. Test. Operate engine until it reaches normal operating
temperature. Check frequency meter. Frequency meter should
indicate 61.5 Hz at no load. Apply full rated load to unit. Gover-
nor should adjust engine speed to equal 60 Hz output without
hunting (alternate increasing and decreasing of speed). Adjust
engine sensitivity if necessary as given below.
(1) Low Speed Adjustment. Adjust low speed (1600 RPM)
by repositioning the control nut (7, figure 7-2) at the attaching
bracket located inaide the engine access door. The control knob
should be pushed fully in before making the low speed adjust-
ment. This reduces tension on the spring (17) permitting gover-
nor arm (3) to move the injector pump (2) to lower fuel position
reducing engine speed.
(2) High Speed Adjustment. Adjust high speed (2250
RPM) by setting the maximum speed stop screw (18), located
at the front of the engine (clockwise lowers speed,
counterclockwise increases speed) with the control knob pulled
fully out. The control knob can then be intermediately posi-
tioned for 61.5 Hz (no load) operation.
(3) Sensitivity Adjustment. Adjust governor sensitivity
(no load to full load speed droop) by turning the sensitivity ad-
justing 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
decreasing of speed). Adjust for maximum sensitivity without
d. Remove. Disconnect governor linkage (1) from injector
pump (2) and governor arm (3). Remove governor arm (3) and
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).