Grand Cherokee 2WD L6-242 4.0L VIN S MFI (1993)
may be removed with crocus cloth using only very light pressure.
Minor distortion of a valve body mating surface may be corrected by smoothing the surface with a sheet of crocus cloth. Position the crocus cloth on a
surface plate, sheet of plate glass or equally flat surface. If distortion is severe or any surfaces are heavily scored, the valve body will have to be
replaced.
CAUTION: Many of the valves and plugs, such as the throttle valve, shuttle valve plug, 1-2 shift valve and 1-2 governor plug, are made of
coated aluminum. Aluminum components are identified by the dark color of the special coating applied to the surface (or by testing with a
magnet). Do not sand aluminum valves or plugs under any circumstances. This practice could damage the special coating causing the valve
plugs to stick and bind.
Inspect the valves and plugs for scratches, burrs, nicks, or scores. Minor surface scratches on steel valves and plugs can be removed with crocus cloth but
do not round off the edges of the valve or plug lands. Maintaining sharpness of these edges is vitally important. The edges prevent foreign matter
from lodging between the valves and plugs and the bore.
Inspect all the valve and plug bores in the valve body. Use a penlight to view the bore interiors. Re-place the valve body if any bores are distorted or
scored. Inspect all of the valve body springs. The springs must be free of distortion, warpage or broken coils.
Check the two separator plates for distortion or damage of any kind. Inspect the upper housing, lower housing, 3-4 accumulator housing, and transfer
plate carefully. Be sure all fluid passages are clean and clear. Check condition of the upper housing and transfer plate check balls as well. The check
balls and ball seats must not be worn or damaged.
Trial fit each valve and plug in its bore to check freedom of operation. When clean and dry, the valves and plugs should drop freely into the bores.
Valve body bores do not change dimensionally with use. If the valve body functioned correctly when new, it will continue to operate properly after
cleaning and inspection. It should not be necessary to replace a valve body assembly unless it is damaged in handling.
The only serviceable valve body components are listed below. The remaining valve body components are serviced only as part of a complete valve
body assembly. Serviceable parts are:
^
dual solenoid and harness assembly
^
solenoid gasket
^
solenoid case connector 0-rings and shoulder bolt
^
switch valve and spring
^
pressure adjusting screw and bracket assembly
^
throttle lever
^
manual lever and shaft seal
^
throttle lever shaft seal, washer, and E-clip
^
fluid filter and screws
^
detent ball and spring
^
valve body screws
^
governor pressure solenoid
^
governor pressure sensor and retaining clip
^
park lock rod and E-clip
Assembly
VALVE BODY REASSEMBLY
CAUTION: Do not force valves or plugs into place during reassembly. If the valve body bores, valves and plugs are free of distortion or
burrs, the valve body components should all slide Into place easily. In addition, do not overtighten the transfer plate and valve body screws
during reassembly. Over-tightening can distort the housings resulting In valve sticking, cross leakage and unsatisfactory operation. Tighten
valve body screws to recommended torque only.
Lower Housing Assembly (Fig. 124)
(1) Lubricate valves, springs, and the housing valve and plug bores with clean transmission fluid.
(2) Install 3-4 timing valve spring and valve in lower housing.
(3) Install 3-4 quick fill valve in lower housing.
(4) Install 3-4 quick fill valve spring and plug in housing.
(5) Install timing valve end plate. Tighten end plate screws to 4 N.m (35 in. lbs.) torque.
(6) Install 3-4 shift valve and spring.
(7) Install converter clutch valve, spring and plug.
(8) Install converter clutch timing valve and spring.
3-4 Accumulator Assembly (Fig. 125)
(1) Lubricate accumulator piston, seals and housing piston bore with clean transmission fluid.
(2) Install new seal rings on accumulator piston.
(3) Install piston and spring in housing.
(4) Install end plate on housing.
Transfer Plate Assembly
(1) Install rear clutch and rear servo check balls in transfer plate (Fig. 118). Some early production valve bodies will have steel check balls while later