Wiper motor and pump

[71CHEVYSHORTBED402]

From 1971 C-10

Untested notes. I haven't reassembled, but these are probably pretty tight. "TS" just means truck side (e.g., right hand truck side). I get carried away with it...........HA!


Wiper Motor Correct positioning of the wiper motor is the ports are on top facing the LH (TS).

The wiper motor mounts using three plain finish 5/16" recessed hex screws with integrated "cup" star washers. The screw threads are #10-24 x 1.

The motor uses pliable rubber along the inner perimeter of the front base of the motor, which acts as mounting pad and sealer. Use Butyl black caulking (never silicone).

Wiper Transmissions Wiper transmission arms description: The LH (TS) wiper arm has a spike on it that faces the front (TS). This arm is stamped with "57". The RH (TS) wiper arm has an arc along the center that faces front (TS). This arm is stamped with "52". The approx. 3" arm on the RH (TS) transmission is stamped with "K". NOTE: The top of the transmissions, and where they mount to the cowl are domed.

Grommet: A dust boot fits on the wiper motor crank shaft between the cowl and the crank arm.

Crank arm: The clevis pin on the end of the crank arm should be positioned at 3-clock (see assembly manual). The crank arm mounts using a 7/16" flange nut. The bottom of the head is serrated. The threads are 1/4-28.

Wiper transmissions arms assembly:
Both arms attach to the clevis pin on the crank. The LH (TS) transmission arm is positioned on top of the RH (TS) transmission arm. A clip retains the transmission arms onto the crank pin. Insert the clip in from the top and lock it into place.

Each transmission mounts to the cab using two 5/16" recessed hex screws with integrated "cup" star washers. The screw threads are #10-24 x 1/2.

Wiper Switch Wiper switch installation: The flat portion of the rod for the knob faces up, slightly cocked to the LH (TS). At least mine was. The switch attaches to the dash panel using a 5/8" nut and star washer.

A chrome bezel screws onto the wiper switch. The knob screws onto the switch's knob with a tiny slot-head screw.

Wiper switch wiring: The following descriptions are from the top down for the switch in a mounted position.

• 18 AWG light blue: Operates the wipers (high/low). This wire runs to the dual pins on the RH (TS) portion of the motor.

• 18 AWG dark blue: Operates the washer. This wire runs to the dual pins in the bottom of the motor. NOTE: The bottom is the widest of the two dual connector/pins on the motor.

• 18 AWG black: Ground wire. This wire connects to the single pin on the RH (TS) portion of the motor.

Other wire (power):

• 18 AWG yellow: This wire runs from the fuse box to the connector on the bottom of the motor. A second yellow wire leads from this connector to the dual pin connector on the RH (TS) portion of the motor. NOTE: Yellow was positioned on the bottom of both dual connectors.

NOTE: The wiper switch is a grounding side switch, Meaning it controls the negative side of the circuit rather than positive like most switches. There are no hot wires going to the wiper switch. The only hot wire is the yellow wire from the fuse panel.

Windshield Washer Bottle
& Hoses Hoses grommet: The hoses run through the firewall using a three hole grommet. The largest hole in the grommet indicates the top. The hoses route through the insulation pad pending.

Windshield washer bracket installation: The bracket mounts to the LH (TS) fender using three 3/8" flange tap screws. The screw threads are 1/4" x 1/2".

NOTE: The inside diameter for the hose to the bottle is 7/32". The inside diameter for the hoses from the bottle are 5/32".

See this thread for hose routing: http://67-72chevytrucks.com/vboard/s...d.php?t=711813