Jeep Wrangler 1997, Manual

Page: 1049 / 1152

TRANSMISSION
Clean the case in a solvent tank. Flush the case
bores and fluid passages thoroughly with solvent.
Dry the case and all fluid passages with compressed
air. Be sure all solvent is removed from the case and
that all fluid passages are clear.
NOTE: Do not use shop towels or rags to dry the
case (or any other transmission component) unless
they are made from lint-free materials. Lint will
readily adhere to case surfaces and transmission
components and will circulate throughout the trans-
mission after assembly. A sufficient quantity of lint
can block fluid passages and interfere with valve
body operation.
Inspect the case for cracks, porous spots, worn
servo bores, or damaged threads. However, the case
will have to be replaced if it exhibits damage or wear.
Lubricate the front band adjusting screw and lock-
nut with petroleum jelly and thread it part way into
the case. Be sure the screw turns freely and does not
bind. Install the locknut on the screw after checking
screw thread operation.
Inspect all the transmission bushings during over-
haul. Bushing condition is important as worn, scored
bushings contribute to low pressures, clutch slip and
accelerated wear of other components. Replace worn,
or scored bushings, or if doubt exists about bushing
condition.
Use recommended tools to replace bushings. The
tools are sized and designed to remove, install and
seat bushings correctly. The bushing replacement
tools are included in Bushing Tool Sets C-3887-B, or
C-3887-J.
Pre-sized service bushings are available for
replacement purposes. Only the sun gear bushings
are not serviced. Replace the gear as an assembly if
the bushings are severely scored, or worn.
Heli-Coil inserts are recommended for repairing
damaged, stripped or worn threads in aluminum
parts. Stainless steel inserts are preferred.
The use of crocus cloth is permissible where neces-
sary, providing it is used carefully. When used on
valves, use extreme care to avoid rounding off sharp
edges. Sharp edges are vital as they prevent foreign
matter from getting between the valve and valve
bore.
Do not reuse oil seals, gaskets, seal rings, or
O-rings during overhaul. Replace these parts as a
matter of course. Also do not reuse snap rings or
E-clips that are bent or distorted. Replace these parts
as well.
Lubricate transmission parts with Mopar
t
ATF
Plus 3, Type 7176 transmission fluid during assem-
bly. Use Mopar
t
Door Ease, or Ru-Glyde to lubricate
piston seals and O-rings. Use petroleum jelly on
thrust washers and to hold parts in place during
reassembly.
OVERRUNNING CLUTCH/LOW-REVERSE
DRUM/OVERDRIVE PISTON RETAINER
Clean the overrunning clutch assembly, clutch cam,
low-reverse drum, and overdrive piston retainer in sol-
vent. Dry them with compressed air after cleaning.
Inspect condition of each clutch part after cleaning.
Replace the overrunning clutch roller and spring
assembly if any rollers or springs are worn or dam-
aged, or if the roller cage is distorted, or damaged.
Replace the cam if worn, cracked or damaged.
Replace the low-reverse drum if the clutch race,
roller surface or inside diameter is scored, worn or
damaged. Do not remove the clutch race from
the low-reverse drum under any circumstances.
Replace the drum and race as an assembly if
either component is damaged.
Examine the overdrive piston retainer carefully for
wear, cracks, scoring or other damage. Be sure the
retainer hub is a snug fit in the case and drum.
Replace the retainer if worn or damaged.
FRONT SERVO
Clean the servo piston components with solvent
and dry them with compressed air. Wipe the band
clean with lint free shop towels.
Replace the front band if distorted, lining is
burned, flaking off, or worn to the point where the
grooves in the lining material are no longer visible.
Inspect the servo components (Fig. 171). Replace
the springs if collapsed, distorted or broken. Replace
the guide, rod and piston if cracked, bent, or worn.
Discard the servo snap ring if distorted or warped.
Check the servo piston bore for wear. If the bore is
severely scored, or damaged, it will be necessary to
replace the case.
Replace any servo component if doubt exists about
condition. Do not reuse suspect parts.
Fig. 171
TJ
TRANSMISSION AND TRANSFER CASE 21 - 143
CLEANING AND INSPECTION (Continued)