Accelerator Pump Stroke Adjustment; Idle Speed And Mixture Adjustments; Idle Speed Adjustment - Jeep J-10 Series 1982 Technical & Service Manual

Accelerator Pump Stroke Adjustment
The specified accelerator pump stroke has been se
lected to help maintain the exhaust emission level of the
engine within regulations. The unused adjustment holes
permit adjusting the stroke for a specific engine appli
cation and ambient location. The primary throttle shaft
lever (overtravel lever) has four holes and the accelera
tor pump link has two holes (fig. 1J-138).
For normal operating conditions, the accelerator
pump operating rod should be in the third hole (away
from the lever pivot) of the overtravel lever and the
inboard hole (closest to the pump plunger) in the acceler
ator pump lever. In extremely hot climate regions, the
pump stroke may be shortened to provide smoother ac
celeration by placing the pump rod in the second hole of
the overtravel lever. In extremely cold climate regions,
the pump stroke may be increased to provide smoother
acceleration by placing the pump rod in the fourth hole
of the overtravel lever.
(1) Remove retaining clip from operating rod.
(2) Position clip over specified hole in overtravel
lever. Insert operating rod end through clip and over-
travel lever. Snap release clip over rod end.
Idle Speed and Mixture Adjustments
Idle Speed Adjustment
NOTE: When adjusting idle speed, put manual trans
mission in Neutral Put automatic transmission in
Drive.
WARNING: Set parking brake firmly. Do not acceler
ate engine.
(1) Connect tachometer, start engine and warm to
normal operating temperature. Choke must be off.
WARNING: Use extreme caution when engine is oper
ating. Do not stand in direct line with fan. Do not put
hands near pulleys, belts or fan. Do not wear loose
clothing.
(2) Turn hex-head screw on solenoid carriage to ob
tain 600 rpm.
(3) Disconnect solenoid wire connector and adjust
curb idle screw to obtain 500 rpm curb idle speed.
(4) Connect solenoid wire connector.
(5) If equipped with dashpot: with throttle at curb
idle position, fully depress dashpot stem and measure
clearance between stem and throttle lever. Clearance
should be 0.032 inch (0.813 mm). Adjust by loosening
locknut and turning dashpot.
Idle Mixture Adjustment
NOTE: The idle mixture should be adjusted only if the
mixture screws were removed or altered during major
carburetor overhaul.
(1) Connect tachometer. Start engine and warm to
normal operating temperature.
FUEL SYSTEMS 14-71
OUTBOARD
AJ41662
Fig. 14-13S Accelerator Pump Stroke Adjustment
NOTE: Use a tachometer with an expanded scale of
400-800 or 0-1000 rpm. Inspect tachometer periodically
to ensure accuracy within two percent.
(2) Position automatic transmission in Drive, man
ual in Neutral.
(3) Adjust idle speed to specified rpm. Use Set-To
value.
(4) Turn mixture adjustment screws leaner (clock
wise) until perceptible loss of rpm is noted.
(5) Turn mixture screws richer (counterclockwise)
until highest rpm is obtained. Do not turn screws any
further than position where highest rpm is first ob
tained. This is referred to as lean best idle.
NOTE: Engine speed will increase above curb idle
speed an amount thatcorresponds approximately to the
lean drop specification.
(6) As final adjustment, turn both idle mixture
screws clockwise in small, equal amounts until specified
drop is achieved.
NOTE: // the final rpm differs more than ± 30 rpm
from the originally adjusted curb idle speed, adjust curb
idle to specification and repeat steps (5) and (6).
(7) Install mixture screw caps removed during over
haul. Use care to prevent disturbing mixture adjust
ment while installing caps.
Model 2150 Carburetor Idle Drop
Engine Transmteion
Idlo Drop RPM
360
2V
Manual
Automatic
50
20
81154