Setting engine speed (RPM)
Check that the throttle mechanism functions normally.
Check that the throttle arm (1) (Fig. moves towards low
i
dle (2) when the throttle mechanism is in idling position
and moves towards the stop screw at wide open throttle
(
WOT) (3) when the throttle mechanism is at wide open
throttle (WOT). Adjust the throttle mechanism if neces-
sary. Also check that the air filter and air intake are not
blocked.
I
MPORTANT!
The engine speed (RPM) and
fuel quantity are factory set to give maximum
output and minimum environmental impact. The-
se settings must not be changed
Seals on the fuel injection pump may only be
broken by authorised personnel. Broken seals
must always be resealed
1.
Check that gap (6) (Fig. 92) is approximately 3 mm
when the throttle mechanism is in the idling posi-
tion. If necessary: Slacken off the locknut (7) and
adjust until the correct gap is obtained with the
screw (8).
2.
Warm up the engine and check the idling speed
using a workshop tachometer (see Technical Data
for correct idling speed).
3.
I
f
necessary, adjust to the correct idling speed
using the adjustment screw (2).
4.
Check gap (3) again according to point 1.
Engine racing (high idling speed)
Warm up the engine and check the engine racing speed
using a workshop tachometer when the engine has no
l
oad at wide open throttle (WOT) (see Technical Data
for correct engine racing speed).
Adjust if necessary as follows:
1.
Slacken off the stop screw (3) so that it does not li-
mit the movement of the throttle arm (1).
2.
Run the engine with no load at wide open throttle
(
WOT) and adjust to the correct rev speed using
the adjustment screw (4) (remember to reseal the
screw).
3.
Adjust the stop screw (3) so that there is a clearan-
ce of 0.1 mm between the stop screw (3) and the
throttle arm (1) when the throttle mechanism is at
wide open throttle (WOT).
Feed pump
Fuel
system
5
7
Fig. 92. Setting engine speed (RPM)
Dismantling of feed pump
1.
Throttle arm
1.
Wash clean round the pump.
2.
Adjustment screw, low idling speed
3.
Stop screw, wide open throttle (WOT)
4.
Adjustment screw, engine racing
5.
Adjustment screw, maximum quantity of fuel
2.
Close the fuel cocks. Release the fuel connections
3.
from the pump.
Dismantle the feed pump from the cylinder block.
Low idle speed
Empty the pump of fuel.
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