Reverse Delay Valve; Delay Valve Code; Forward Delay Valve Time Limits; Reverse Delay Valve Time Limits - Jeep J-10 Series 1982 Technical & Service Manual

=D
CONTROLLED SIDE
IS
COLOR CODED
VACUUM SOURCE
SIDE WILL BE
BLACK (FORWARD)
OR
WHITE (REVERSE)
=n
COLOR CODED SIDE OF DELAY VALVES
HAS A CROSSHATCH PATTERN THAT IS
ALWAYS CONNECTED TO THE COMPONENT
BEING CONTROLLED
Rg. 16-27 Delay Valve Code
81093
NOTE: While testing delay valves use care to prevent
oil or other foreign material from entering vacuum
ports.
(5) Replace valve if it fails test, otherwise, install
original with black side toward vacuum source.
NOTE: In addition to the valves listed in the chart,
certain engine applications employ a two-way delay
valve. The body is orange and the minimum and max
imum delay time limits are 0.2 to 04 seconds.
Forward Delay Valve Time Limits
Part Numbers
Time In Seconds ( Color and Identification
3230422
3231118
3231379
3235261
3236284
3237293
3239134
200 ±40
100 ±20
63.5 ±13.5
10 ± 2
4 ± 0.8
20 ± 4
2 ± 0.5
Black/Green
Black/Yellow
Black/White
Black/Gray
Black/Purple
Black/ Brown
Black/Orange
f!8MW\ NOTE:
/S|^
Two Way Delay Valve
3237255
2.0 ± 0.5 Orange/Orange
Four-Part Reverse Delay Valve
527011 8.0 ± 1.6
547883 3.0 ± 0.6
Black/Blue
Black/Brown
81182B
IGNITION SYSTEMS 1G-35
Reverse Delay Valve
Along with the forward delay valve, a reverse delay
valve is used with certain engines to improve cold engine
driveability and to reduce undesirable hydrocarbon
(HC) emission.
When an engine is started, manifold vacuum applied
to the distributor vacuum advance mechanism advances
ignition timing. When the engine is accelerated mani
fold vacuum decreases causing the ignition timing to be
retarded. To prevent the sudden retarding of ignition
timing during acceleration, a one-way reverse delay
valve is inserted in the vacuum line to delay the effects
of the decrease in manifold vacuum.
Functional Test
(1) Connect external vacuum source to port on
white side of delay valve.
(2) Connect one end of 24-inch (60 cm) section of
rubber hose to vacuum gauge and other end to port on
colored side of valve.
(3) With elapsed time device in view and a constant
10 in. Hg (34 kPa) of vacuum applied, note time required
for gauge pointer to move from 0 to 8 in. Hg (0 to 27
kPa).
(4) Compare time to acceptable time limits listed in
Reverse Delay Valve Time Limits chart.
Reverse Delay Valve Time Limits
Part Numbers Time In Seconds Color and Identification
3235938
3235939
3236285
3237131
3237141
3237184
3239383
10 ± 2
20 ± 4
4± 0.8
.„ - 3
2 ± 0.5
White/Gray
White/Brown
White/Purple
White/Red
White/Yellow
White/Gold
White/Orange
81182A
NOTE: While testing delay valves use care to prevent
oil or other foreign matter from entering vacuum ports.
(5) Replace valve if it fails test, otherwise, install
original valve with white side toward vacuum source.
SPECIFICATIONS
Vacuum Advance Control System Specifications
ENGINE STANDARD COOUNG HEAVY DUTY COOUNG
IToD 2ToD
IToD 2ToD
4-151
Below
120°F (49°C)
Above
120°F (65°C)
6-258
Below
155PF (68°C)
Above
155°F (68PC)
Below
220°F (104°C)
Above
220°F (104°C)
8-360
Below
155°F (68°C)
Above
155PF <68°C)
Below
220°F (104°C)
Above
220°F (104°C)
NOTE: TEMPERATURES ARE NOMINAL VALUES
81094A