Setting The Engine Speed - Volvo Penta D2-55 Workshop Manual

7
5 4 3
1. Actuator arm
2. Adjustment screw, low idle
3. Stop screw, full throttle
4. Adjustment screw, racing speed
5. Adjustment screw, max. fuel volume
7. Lock nut
6
8
2
1

Setting the engine speed

Check that the accelerator control functions normally,
i.e. the actuator arm (1) is pressed against the low idle
stop (2) when the accelerator control is at idle, and is
pressed against the full throttle screw (3) when the ac-
celerator control is at full throttle. Adjust the control if
necessary. Also check that the air filter is not
blocked, and that the air inlet is not blocked.
IMPORTANT! The engine's fuel volume and
speed are set at the factory to give highest pow-
er and least environmental impact. These set-
tings must not be disturbed.
NOTE! Seals on injection equipment may only be bro-
ken by authorized personnel. Seals which have been
broken must be re-sealed.
Low idle
1. Check that the gap (6) is about 3 mm when the
accelerator is in the idle position. If necessary:
Undo locknut (7) and adjust screw (8) to give the
correct gap.
2. Warm up the engine and check the idle speed
with a tachometer (refer to Technical data for the
correct idle speed).
3. Adjust to the correct idle speed with adjusting
screw (2).
4. Check the gap (3) again as in item 1.
Racing speed (high idle)
Warm the engine up and check the racing speed with
a workshop tachometer when the engine is unloaded
at full throttle (please refer to "Technical data" for cor-
rect racing speed).
Adjust the following as necessary
1. Loosen the stop screw (3) so that it does not limit
the movement of the actuator arm (1).
2. Run the engine unloaded at full throttle and adjust
to the correct racing speed with adjuster screw (4)
(remember to re-seal the screw).
3. Adjust stop screw (3) to give a clearance of 0.1
mm between stop screw (3) and the actuator arm
(1) when the throttle control is at the full throttle
position.
Group 23 Fuel system
59