Description of 1951 Buick Windshield Wiper

On Series 40, the windshield wiper motor is mounted under the cowl and is connected to the two windshield wiper transmissions by flat steel links.

On Series 50-70, the windshield wiper motor is mounted on an auxiliary drive which is attached to the front face of the cowl panel, under the hood. The motor drives a short shaft in the auxiliary drive which extends through the cowl panel. A cross lever on rear end of the auxiliary shaft actuates the wiper transmissions through cables attached to the lever and to pulleys in the transmissions. The cables run around pulleys on cable tensioners mounted under the cowl. Each cable tensioner has a spring and ratchet which automatically take up slack and maintain proper tension on the cables.

CAUTION: 1951 Buick Windshield wiper arms must not be rotated by hand for any reason as this places an undue strain on the cable fasteners.

The tube which connects the wiper motor to engine intake manifold is attached to a valve on the motor. The motor valve is actuated by a bowden cable extending from a control mounted on left end of instrument panel. The 1951 Buick windshield wiper is operated, with engine running, by turning control knob clockwise. When car is equipped with a windshield washer the wiper control contains a button to control washer operation as described in paragraph 11-2.

Correction of Sluggish Windshield Wiper Motor

If 1951 Buick windshield wiper motor is sluggish or lacking in power first make certain that the vacuum pump is operating properly and all hose connections are tight, as outlined in paragraph 3-16. If windshield wiper motor is found to be at fault, check and lubricate the motor as follows:

  1. Remove valve cover and gasket, then lift out the kidney valve with needle nose pliers. See figure 13-11. NOTE: Wiper motor must be removed from car on Series 40 only.
  2. Check distance that kidney valve tube protrudes from valve body. If distance is greater than 1/8″, press tube into valve body to this dimension. See figure 13-13.
    1951 Buick Removing Kidney Valve and Checking Tube

    1951 Buick Removing Kidney Valve and Checking Tube

  3. The kidney valve tube must be a snug fit in valve body. If kidney valve tube is loose enough to be jiggled with fingers after being set to specified dimension the wiper motor should be replaced.
  4. Wipe all dirt and lubricant from surfaces of kidney valve, valve body behind valve, and valve cover.
  5. Apply a thin coating of “Trico Wiper­Lube” to face of kidney valve that contacts the valve body. This lubricant is available at UMS Service Stations.
  6. Install kidney valve, gasket and cover. Install wiper motor if removed from car. Check wiper motor operation.

Replacement of 1951 Buick Windshield Wiper Control

  1. Loosen clamp screw and disconnect control cable from valve on windshield wiper motor.
  2. On Series 50-70 only, disconnect battery ground cable, then remove fuse block from instrument panel.
  3. Carefully pry control knob rearward to remove it from control valve shaft, to which it is retained by a small spring.
  4. Using special socket wrench shown in figure 13-14 remove control nut and internal-tooth lockwasher then remove control from instrument panel. Disconnect windshield washer hoses if attached to control.