E 350 Van V8-7.3L DSL Turbo VIN F (1995)
Valve Body: Description and Operation
Valve Body, A/T
Line Pressure Coasting Regulator and Boost Valves
DESCRIPTION AND OPERATION
The line pressure coasting valve has been redesigned and a new valve, the line pressure coasting regulator valve, has been added to the same bore. These
valves provide improved line pressure coasting boost for greater torque holding ability at the intermediate band.
Main Oil Pressure Boost Valve
DESCRIPTION AND OPERATION
The pressure boost valve is the same in construction and operation as the earlier boost valve except for operation during a manual shift from Drive range
to 2 or 1 range.
Manual Low 2-1 Scheduling Valve
DESCRIPTION AND OPERATION
This valve and spring are located in the bore that formerly housed the 3-2 coasting control valves. When governor pressure on the upper end of the valve
drops to the appropriate value, 2-1 scheduling pressure together with spring force will force the D2 shift valve upwards, effecting a downshift.
Manual Valve
DESCRIPTION AND OPERATION
One passage controls pressure to the manual valve. The valve is positioned by the manual linkage according to mode of operation desired.
Primary Throttle Valve
DESCRIPTION AND OPERATION
The primary throttle valve generates throttle pressure in the same way as earlier models and at the same rate with respect to manifold vacuum.
1-2 Shift Valve Train
DESCRIPTION AND OPERATION
In construction and operation the 1-2 shift valve train is the same as the earlier transmission except that the spring end of the D2 valve is pressurized with
manual 2-1 scheduling pressure during a 2-1 or 3-1 manual downshift rather than with line pressure as in the earlier transmission.
2-3 Backout Valve
DESCRIPTION AND OPERATION
The 2-3 backout valve is functionally the same as the earlier valve but is slightly different in appearance. The valve has been redesigned so that the
spring is housed in the lower part of the valve. In addition, the lower end of the spring seats in a spring retainer, and a spring retainer clip retains the
entire valve train in the bore.
2-3 Shift Orifice and Check Valve
DESCRIPTION AND OPERATION
When the manual lever is moved to 2 or 1 to force a 3-2 downshift, the 2-3 shift orifice check ball unseats to allow the release fluid to bypass the orifice
and exhaust without further obstruction.
3-2 Shift Timing Valve
DESCRIPTION AND OPERATION
This valve moves in response to variations in governor pressure which is routed to the upper end of the valve. However, the valve is non-functional and
its position does not affect the operation of the control assembly.
With E4OD
DESCRIPTION AND OPERATION
The main control body assembly directs transmission fluid under pressure to the servo, clutches, and solenoids.
