Re: 55 clipper wiper with washer and coordinator

Posted by HH56 On 2014/6/12 14:46:03

The check valve behind the carb in the 3/8 tubing is for the brake vacuum and is not directly part of the wiper.

The wiper and washer is supplied by a different manifold vacuum source and by the aux pump thru the balancing valve. The balance valve is basically a flow control valve for the wiper and is constructed so normally both vacuum source ports are open. If the engine is under enough load so the engine vacuum source drops, the valve will actuate to block off the engine port so vacuum is maintained via the aux pump. It will do the same thing in reverse if something happens and the aux pump source is diminished. There is a check valve low on the side of engine in the line from the aux pump. That is to prevent manifold vacuum from pulling any oil from crankcase thru but is not for checking wiper vacuum directly.

The blades do park at the bottom. That is controlled by the main slide valve on the motor. When the wipers are turned on the valve slides to open a port to the center swing valve. The farther the slide moves, the more vacuum is allowed so faster motor will move. The swing valve connects vacuum to each side of the paddle chamber and motor operates as they all do. The vacuum is controlled by the swing valve so the motor paddle does not operate in a full range before it is switched to the opposite side. The V8 motors have the "sweep control" and is a small extra piston assy in that front compartment on the motor. That piston moves a mechanism to change the point where the actuation of the swing valve occurs. Regular sweep or the shorter narrow sweep which results in the so called "fast" action. The presence or absence of vacuum to that extra piston is controlled by the lever on the switch.

When the motor is turned off, the slide valve moves to the extreme end and connects vacuum to an extra port and sort of a cup affair which is in the motor lid. That action pulls the motor paddle past the normal sweep area and up against the lid where it covers the port and cup. Paddle remains pulled in tight to lid with blades on the bottom until the next time the motor is turned on.

Not sure about there being any kind of substance inside the coordinator. I believe it is just a spring, diaphragm & air. Normally vacuum is applied to the solenoid in washer lid and to the water control valve also in lid. Vacuum is blocked from going any farther. When the washer solenoid is electrically activated, vacuum pulls the pump piston up so water can charge. When button is released, vacuum to piston is blocked again, air is allowed to piston and vacuum is still applied to the water control valve. As the spring pushes piston back down and water out, a diaphragm in the control valve is moved by outgoing water pressure to control vacuum to coordinator. In addition to the water flowing to WS, with vacuum allowed to pass thru to the coordinator, that moves the diaphragm to activate the slide valve on motor and start wipers. As the water discharges, vacuum to coordinator is maintained until water stops flowing. When water pressure on the diaphragm stops, vacuum is cut off to coordinator and the air bleed slowly lets air in as the spring pushes diaphragm back. That pulls the slide valve to the off position and motor stops and parks.

The co-ordinator works the slide valve in the same fashion as the cable from switch would on cars without the coordinator. When the coordinator is installed, there is a slightly different cable attaching arrangement. In that case the mechanical cable from switch operates the coordinator assy instead of slide valve so the entire coordinator slides in its bracket when motor is manually turned on. The switch still has control and coordinator is along for the ride but does nothing except be the physical connection to the slide valve. When the washer wants control, it applies vacuum to the coordinator. That extends a small wire to operate the slide valve. As the air bleed controls the return, the spring inside the coordinator pulls the slide valve back to the off position. The way the mechanical cable from the switch is installed any interference with coordinator is prevented because cable does not directly operate the slide valve - other than the tip does push against slide valve to move the coordinator and valve but is not connected to it.

I do have photos of the motor with and without coordinator hookup if you want to see them.