Mitsubishi S4S Service Manual page 46

ADJUSTMENTS, BENCH TEST, PERFORMANCE TESTS
(1) Starting engine
(a) Pull speedcontrolleverto the high speed side.
Operate the starter switch to crank the engine.
(b) The engine will fire up at 150 min-lof
cranking speed. When the engine fires, hold
the engine speed between 800 and 1000 min-I.
(c) When the engine runs with a steady speed,
move the speed controllever back to the idle
speed position.
(2) Setting no-Ioad minimum (idle) speed
Govemor
set bolt -
Speed con trol lever
Low idle speed
set screw
Idle sub-spring
adjusting screw
(a) Hold the speed control lever at the position
for no-Ioad minimum (idle) speed and set low
idle speed set screw.
...----------JLt,CAUTION
1 - - - - -__
If a critical speed (the speed at which the engine
excessively vibrates due to torsional resonance)
might exist, shift the setting to a lower or higher
idle speed level.
(b) The engine speed will increase when the low
idle speed set screw is turned clockwise.
(c) If the engine speed tends to fluctuate, turn idle
sub-spring adjusting screw clockwise to bring
this spring into slight contact with the tension
lever for eliminating fluctuation.
...----------JLt,CAUTION
1 - - - - -__
Tightening the idle sub-spring adjusting screw
is likely to cause the engine to overspeed when
the load is removed during operation. Be sure to
tighten this adjusting screw just enough to
eliminate the unstable condition.
5-6
Low idle speed
set screw
Setting no-Ioad minimum (idle) speed
Idle sub-spring
adjusting screw
Setting idle sub-spring adjusting screw