
ALPHA series engines worksHoP mAnuAL
56
CAution
On some engines a tamperproof setscrew nut
is fitted to prevent changes being made to the
engine stop/run control settings. In these cases
adjustment is not possible.
CAution
The settings given below are the initial settings.
Resetting may be necessary to achieve optimum
running and performance.
The following instructions only apply to engines not
fitted with tamperproof nuts.
The adjustment should not be made until the engine
control lever has been correctly set.
2.54 sPeed QuAdrAnts
2.54.1 fixed speed Adjustment
The minimum full load speed for all engines and
builds is 1500r/min.
The two setscrews (A) and (B) are adjusted until at
the required speed both make contact with the speed
control, both are then locked in position with the
locknuts.
Rotating the setscrew (B) anti clockwise increases
the engine speed.
Figure 2.54.1 Fixed Speed Adjustment
2.54.2 variable speed Adjustment
The speed of the engine is controlled by the tension
of the speeder spring. The spring is attached to the
speed control, which in turn can be operated either
by a cable, rod, lever or solenoid.
The setscrew (B) is adjusted until it makes contact
with the speed control quadrant, at the required
maximum speed, and then locked in position with
the locknut.
Rotating the setscrew anti clockwise increases the
engine speed.
Figure 2.54.2 Variable Speed Adjustment
2.55 setting tHe stoP/run
Lever
To ensure the control lever is positively stopped by
the control lever stop screw, and not the fuel pump
stops, the following sequence must be carried out
with the end cover in position.
CAution
On some engines a tamperproof setscrew nut
is fitted to prevent changes being made to the
engine stop/run control settings. In these cases
adjustment is not possible.
1. Turn the engine control lever (A) anti clockwise
towards the 'STOP' position until the fuel pump
stop is just felt with gentle finger pressure.
2. Slacken the nut (B) and adjust the setscrew (C)
until it just touches the control lever A).
Figure 2.55.1 Setting the Control Lever
3. If an energised to stop fuel control solenoid is
not fitted, screw the setscrew (C) out a further
one turn and tighten the locknut.
For engines fitted with an energised to stop fuel
control solenoid:
LPW(T) - screw the setscrew (C) out a further
1.5 turns.
LPWS(T) - screw the setscrew (C) out a further
2.5 turns.
1. Move the engine control (B) to the run position.