Thunderbird L4-140 2.3L SOHC Turbo (1984)
Speedometer Head: Service and Repair
Speedometer/Odometer Mechanical Assembly Replacement
NOTE: Federal Law requires that the odometer in any replacement speedometer must register the same mileage as that registered in the removed
speedometer.
The electronic speedometer can be serviced by replacement of either the electronic or mechanical portions.
REMOVAL
1.
Disconnect the battery ground cable.
2.
Remove the instrument cluster.
3.
Remove the six screws from the front of the instrument cluster backplate and separate the mask and lens assembly from the backplate.
4.
Remove the switch cap nut from the English/Metric switch and remove the switch from the mask.
5.
Remove the four terminal insulator from the retaining nuts on the back of the cluster assembly.
6.
Remove the five retaining nuts from the electronic speedometer housing studs on the back of the cluster assembly.
7.
From the front of the speedometer/odometer assembly, remove the four screws that attach the plastic speedometer dial to the odometer bridge. Use
a screwdriver to disengage the plastic speedometer bridge assembly. Separate the assemblies.
INSTALLATION
1.
Position the plastic speedometer dial to the odometer bridge assembly and snap the locking tab to the odometer bridge.
2.
Install the four screws that attach the plastic speedometer frame to the odometer bridge.
3.
Insert the optical sensor (T-shaped component with four wires) into the rectangular hole on the odometer bridge, and install the attaching screw.
4.
Position the speedometer/odometer in the backplate and install the two retaining screws.
5.
Apply a 3/16 inch ball of D7AZ-19A3331-A or equivalent silicone lubricant in the drive hole of the speedometer head.
6.
Attach the five terminal nuts to the electronic speedometer housing studs on the back of the cluster assembly. Install the terminal nut insulator.
7.
Install the English/Metric switch to the mask and the cap on the switch.
8.
Position the lens and mask assembly to the backplate and install the six attaching screws.
9.
Install the cluster assembly.
10.
Connect the negative battery cable.
