Analog Speedometer - Inaccurate At High Speeds

Article No.
91-2-8

January 23, 1991

SPEEDOMETER - ANALOG (CONVENTIONAL) - INACCURATE AT HIGH SPEEDS-VEHICLES BUILT BEFORE 4/01/90



FORD:
1989-90 THUNDERBIRD

LINCOLN-MERCURY:
1989 COUGAR



ISSUE:
The base or performance analog speedometer may give inaccurate speed indications above 70 mph (112 km/h). This is caused by calibration tolerances within the speedometer head.

ACTION:
Install a new more accurate speedometer. Refer to the 1989/90 Thunderbird/Cougar Shop Manual, Section 33-10, for service details.



SPEEDOMETER IDENTIFICATION

Late model or improved speedometers can be identified by the white calibration dots located on the face of the speedometer at the 60 mph (100 km/h) graduation. Early production speedometers were not marked with calibration dots.

NOTE:
SPEEDOMETER PART NUMBERS WERE NOT CHANGED WHEN THE PRODUCTION CHANGES WERE IMPLEMENTED. PART NUMBERS FOR THE BASE AND PERFORMANCE SPEEDOMETERS ARE SHOWN IN THE PARTS BLOCK.



PART NUMBER PART NAME CLASS

FOSZ-17255-A Speedometer (English - Base B
Analog)
FOSZ-17255-B Speedometer (Metric - Base ZC
Analog)
FOSZ-17255-C Speedometer (English - B
Performance Analog)
FOSZ-17256-D Speedometer (Metric - ZC
Performance Analog)


OTHER APPLICABLE ARTICLES:
None

WARRANTY STATUS:
Eligible Under Basic Warranty Coverage

OPERATION DESCRIPTION TIME
910208A Install Speedometer 1.2 Hr.

DEALER CODING
BASIC PART NO. CONDITION CODE
17255 53

OASIS CODES:
204000, 204200