Silicone Fluid Replacement
- Remove control valve and clean exterior of valve. Position valve with delay plug on top. Remove delay plug and drain silicone fluid from chamber. Remove and discard "O" ring from chamber (see illustration). Remove cover plate retaining ring. Remove the delay cover from valve body. Extract "O" ring from chamber. Discard ring.
- Place a new "O" ring over the delay plug and install plug. Torque plug to 20-30 INCH lbs. Pour silicone fluid into delay piston chamber until fluid level is 5/16" below top edge of the body.
- Hold control valve body in a vise, with delay chamber slightly elevated. Carefully operate the lever, to purge trapped air from the fluid. Install a new "O" ring, install cover, and secure with snap ring.
- Place control valve vertically in a vise, with delay chamber down. Move the overtravel lever up and down for one minute, to vent air from delay piston chamber. Perform Time Delay Check off the vehicle. If delay is not within 4-30 second specification range, recheck fluid level in chamber. If level is proper, replace valve.
Courtesy of FORD MOTOR CO.