Flushing Oil Cooler And Cooler Lines; Throttle Linkage; Gearshift Linkage; Road Test - Jeep J-10 Series 1982 Technical & Service Manual

2C-12 AUTOMATIC TRANSMISSION
(7) Add or drain fluid as necessary to bring fluid to
correct level. If level was low, check transmission for
leaks.
(8) Check condition of fluid.
(a) Fluid should be dark red in color and free of
dirt or debris.
(b) If fluid is discolored or smells burnt, but
transmission operation is OK, fluid and filter should be
replaced.
(c) If fluid is badly discolored, smells burnt,
contains metal or frictional material particles and trans
mission problems were experienced, transmission may
require overhaul.
A low fluid level allows the pump to take in air along
with the fluid. As in any hydraulic system, aerated fluid
will cause hydraulic pressures to be low and develop
slower than normal.
If the transmission is overfilled, the gears churn the
fluid into foam aerating the fluid and causing the same
conditions that occur with a low fluid level. In either
case, air bubbles cause fluid overheating, oxidation and
varnish buildup which interferes with valve, clutch and
servo operation. Foaming can also result in fluid escap
ing from the transmission vent where it may be mis
taken for a leak.
Along with fluid level, it is also important to check
fluid condition. When the fluid is dark, smells burnt or
is contaminated with metal or frictional material par
ticles, an overhaul may be necessary. Examine the fluid
on the dipstick closely. If there is any doubt about its
condition, drain out a sample for further inspection.
After checking fluid level and condition, seat the dip
stick fully to seal out water and dirt.
NOTE: After completing any repairs that required
draining the transmission fluid, add 8 pints U.5 liters) of
Jeep, Dexron, or equivalent automatic tra?ismission
fluid to the transmission before starting the engine.
FLUSHING OIL COOLER AND COOLER LINES
If a transmission or lockup clutch failure has con
taminated the fluid, the oil cooler(s) should be reverse
flushed to insure that metal particles or sludged oil are
not later transferred back into the reconditioned
transmission.
(1) Disconnect both cooler lines at radiator.
(2) Dislodge any foreign material at inlet side of
cooler with small screwdriver.
(3) Reverse flush cooler with combination of min
eral spirits and pulsating air under pressure (shop air).
(4) Treat cooler lines separately and insure they are
clear by flowing mineral spirits or automatic transmis
sion fluid through them.
(5) Remove leftover mineral spirits from cooler and
cooler lines by flowing automatic transmission fluid
through them.
(6) Cooler flow should now be checked by con
necting cooler tubes and placing rear cooler tube into 1
quart container. Overfill transmission by 1 quart.
Watching a clock, start engine (run at curb idle) and run
in neutral for exactly 20 seconds. If cooler flow is less
than 1 quart in 20 seconds, replace radiator or have
radiator bottom cooler professionally reconditioned.
THROTTLE LINKAGE
The throttle linkage adjustment is important to
proper operation. This adjustment positions a valve
which controls shift speed, shift quality, and part
throttle downshift sensitivity. If the setting is too short,
early shifts and slippage between shifts may occur. If
the linkage setting is too long, shifts may be delayed and
part throttle downshifts may be very sensitive.
This adjustment is so critical that the use of a throttle
lever holding spring is necessary to remove slack in the
linkage during adjustment. Refer to Throttle Linkage
Adjustment in In-Vehicle Service and Adjustment.
GEARSHIFT LINKAGE
The gearshift linkage adjustment is important be
cause the linkage positions the manual valve in the valve
body. Incorrect adjustment will result in creeping in
Neutral, premature clutch wear, delayed engagement in
any gear or a no-start in Park or Neutral condition.
Proper operation of the neutral start switch will pro
vide a quick check of linkage adjustment as follows:
(1) Insert key in ignition lock and turn lock to On
position to unlock column and gearshift lever.
(2) Move gearshift lever slowly upward until it
clicks into Park detent in shift selector gate.
(3) Turn ignition lock cylinder to Start position and
start engine. If starter operates, Park position is correct.
(4) Stop engine.
(5) Move gearshift lever slowly toward Neutral un
til lever engages in edge of Neutral detent in shift selec
tor gate.
(6) Turn ignition lock cylinder to Start position and
start engine. If starter operates, Neutral position is cor
rect and linkage is properly adjusted.
(7) If starter failed to operate in Park or Neutral, or
if gearshift lever had to be moved back and forth to
achieve start in either position, linkage adjustment is
required. Refer to Gearshift Linkage Adjustment in In-
Vehicle Service and Adjustment section.
ROAD TEST
Before road testing, be sure fluid level, throttle and
gearshift linkage adjustments have been checked and
Corrected if necessary.
Observe engine performance during the test. An en
gine malfunction will have an adverse effect on trans
mission operation. In addition, operate the transmission
in all gearshift positions to check for slippage and shift