THERMAL VALVE
The thermal valve (1) 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. 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 (2). At temper-
atures above 20 degrees, the valve starts to close and
becomes fully closed at approximately 140 degrees.
The thermal valve is located in the transfer plate of
the valve body.
REGULATOR VALVE
The regulator valve (9) controls hydraulic pressure in
the transmission. It receives unregulated pressure
from the pump (6), which works against spring tension
(8) to maintain oil at specific pressures. A system 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.”
1 - FROM OVERDRIVE CLUTCH CIRCUIT
2 - FROM MANUAL VALVE
3 - HYDRAULIC PRESSURE
4 - FILTER
5 - PUMP INLET
6 - PUMP OUTLET
7 - OIL PRESSURE REGULATED AT THIS POINT
8 - SPRING TENSION
9 - REGULATOR VALVE
10 - TORQUE CONVERTER CONTROL VALVE
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AUTOMATIC TRANSMISSION 42RLE - SERVICE INFORMATION
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