Valve Body Description; Operation - Chrysler Vehicle User Manual

TJ
VALVE BODY
DESCRIPTION
The valve body assembly (Fig. 253) consists of a
cast aluminum valve body, a separator plate, and
transfer plate. The valve body contains valves and
check balls that control fluid delivery to the torque
converter clutch, solenoid/pressure switch assembly,
and frictional clutches.
Also mounted to the valve body assembly are the
solenoid/pressure switch assembly and the transmis-
sion range sensor (Fig. 253).
Fig. 253 Valve Body Assembly
1 - SOLENOID/PRESSURE SWITCH ASSEMBLY
2 - TRS
3 - TRANSFER PLATE
4 - SEPARATOR PLATE
5 - VALVE BODY
AUTOMATIC TRANSMISSION - 42RLE
The valves contained within the valve body include
the following (Fig. 254):
• Regulator valve
• Solenoid switch valve
• Manual valve
• Converter clutch switch valve
• Converter clutch control valve
• Torque converter regulator valve
• Low/Reverse switch valve
In addition, the valve body also contains the ther-
mal valve, #2, 3, 4 & 5 check balls and the 2/4 accu-
mulator assembly.

OPERATION

NOTE: (Refer to 21 - TRANSMISSION/AUTOMATIC -
42RLE - SCHEMATICS AND DIAGRAMS) for a visual
aid in determining valve location, operation and
design.
THERMAL VALVE
The thermal valve is a bi-metallic shudder valve
that helps control the venting rate of oil pressure in
the underdrive clutch passage during release of the
clutch (Fig. 255). When the oil temperature is
approximately 20 degrees Fahrenheit or less, the
valve is fully open to assist in venting oil past the U1
orifice. At temperatures above 20 degrees, the valve
starts to close and becomes fully closed at approxi-
mately 140 degrees. The thermal valve is located in
the transfer plate of the valve body.
REGULATOR VALVE
The regulator valve (Fig. 256) controls hydraulic
pressure in the transmission. It receives unregulated
pressure from the pump, which works against spring
tension to maintain oil at specific pressures. A sys-
tem of sleeves and ports allows the regulator valve to
work at one of three predetermined pressure levels.
Regulated oil pressure is also referred to as "line
pressure."
21 - 177