Crankcase Breather Service
If
the crankcase becomes pressurized as evidenced
by oil leaks at the seals, use the following procedures
to
service.
Remove the breather tube from the valve cover (see
Figure
6-10).
Remove the valve cover, pack, spring
washer, reed valve, and breather baffle. Clean all
parts in parts cleaning solvent.
Most parts cleaning solvents are
flammable and can cause severe
personal injury
if
used improperly. Follow the manu-
facturers recommendations when cleaning parts.
HEX
HEAD
CAPSCREW
FLAT
U
I¶
.+
FLAT
PACK
C-1101
+.
FIGURE
6-10.
CRANKCASE BREATHER
The reed valve must be flat with no sign of a
crease. Assemble using a new gasket.
Do
not
overtighten valve cover capscrew.
frequency.
The
governor
maintains
a
constant
enginespeed under changing load conditionsso that
generator voltage and frequency do not vary.
Governor
Adjustments
Before making governor adjustments, run the unit
about
10
minutes under light load to reach normal
operating temperature. If governor
is
completely out
of adjustment, make a preliminary adjustment at no
load to first attain a safe voltage and speed operating
range.
An accurate voltmeter and frequency meter should
be connected to the generator in order to correctly
adjust the governor. A small speed drop not notice-
able without instruments will result in an objectionable
voltage drop.
A
binding in the bearings
of
thegovernorshaft, in the
ball joint, or in the carburetor throttle assembly will
cause erratic governor action or alternate increase
and decrease in speed (hunting). A lean carburetor
adjustment can also cause hunting. Springs tend to
lose their calibrated tension through fatigue after
long usage.
If
the governor action is erratic after all adjustments
are made, replace the spring.
If
this does not improve
operation, the problem is probably within the gover-
nor mechanism. Refer to Governor Cup Section
9
for
service procedures.
Adjustments to the governor should be made in the
following sequence.
1.
The carburetor fuel mixture screws must be cor-
rectly adjusted before governor adjustments are
made. If the carburetor needs adjusting, refer to
Mixturescrew Adjustments in this section before
making any adjustments to the governor.
Touching hot exhaust pipes or
IBWAR"G/
moving parts can result
in
severe personal injury. Use extreme caution
when making adjustments while the engine is
running.
Reed valve must be assembled as shown with washer
on
top
and breather baffle on the bottom.
2.
Adjust the length of the governor linkage and
check for bindina or excessive looseness. The
-1
Over tightening the valve cover can
cause an air leak and allow
dirt
to
enter the engine. Be careful not to distorf the valve
cover when tightening.
GOVERNOR
The governor controls engine speed which directly
affects the voltage output and frequency of the
generator. An increase in enginezipeed will cause a
corresponding increase
in
generator voltage and fre-
quency.
A
decrease in engine speed will cause a
corresponding decrease in generator voltage and
length of the liniage connecting the governor
arm to the throttle shaft assembly is adjusted by
loosening the lock nut and rotating the ball joint
(see Figure
6-11).
Adjust this length
so
that with
the engine stopped and tension on the governor
spring, the stop on the throttle shaft assembly
almost touches the stop on the side of the car-
buretor. (One more turn of the governor ball joint
would allow the throttle shaft stop to touch the
carburetor.) Tighten lock nut.
3.
With the warmed up unit operating no
no
load,
adjust the speed adjustment nut to obtain
62
hertz
and
127.5
(~k4.5)
volts for frequency and voltage.
6-1
1
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
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