Advertisement
20-10
GROUP 20-
MAINTENANCE OPERATIONS
FAST I OLE
(
Bend
u
••ou•••
..
ll+',····
FAST IDLE
STROMBERG (WW SERIES)
STROMBERG (BV2)
FIG. 17 - Curb Idle Speed Adjusting Screws
ADDITIONAL IDLE SPEED AND
FUEL MIXTURE
PROCEDURES
If satisfactory idle condition is
not
obtained after performing the
pre-
ceding normal idle fuel settings,
additional checks of engine systems
must be performed.
1. The following items should
be
checked and, if required, corrected:
a. Vacuum leaks.
b. Ignition
system
wiring contin-
uity.
c. Spark plugs.
d. Distributor breaker point dwell
angle.
e.
Distributor
point
condition.
f. Initial ignition timing.
In certain instances, it may be pos-
sible that the idle condition is
not
as
good as normally expected.
FAST IDLE
ADJUSTING SCREW
FAST IDLE CAM
MOTORCRAFT
MODEL
2100-D, 2V
2. If the idle condition is not
im-
proved after the items in Step 1 have
been checked, perform the following
engine mechanical checks:
a. Fuel Level.
b. Crankcase
ventilation
system.
c. Valve clearance
(using
the col-
lapsed tappet method for hy-
draulic valves).
d. Engine compression.
3. Mter
verification
of all
engine
systems
has been made, t!lere may be
isolated
cases where a
satisfactory
idl~
condition has not been obtained,
due possibly to a
lean
idle fuel mix-
ture,
If this condition
is
encountered,
refer
to
the
specific carburettor sec-
tion of Group
10
of this manual
for
correction
procedure.
FAST
(Bend
.u
••ou,,
..
,....,
.. ,.
STROMBERG (WW SERIES)
FIG. 18- Fast Idle Speed Adjustment
MOTORCRAFT MODEL 4300-4V
MOTORCRAFT MODEL
2100-D, 2V
FAST IDLE ADJUSTMENT
The fast idle adjusting
screw (Fig.
18)
contacts one edge of the
fast
idle
cam. The cam permits a faster engine
idle speed for smoother running when
the engine is cold during choke oper-
ation.
As the choke plate is moved
through
its range of travel from the
closed
to the open position, the
fast
idle cam pick-up lever rotates the
fast idle cam. Each position on the
fast idle cam permits a
slower
idle
rpm
as engine temperature rises and
choking
is reduced.
Make certain
the curb idle
speed and
mixture are adjusted
MOTORCRAFT
MODEL 4300-4V
Advertisement
