Engine - Metal to Metal Noise

Article No.
92-18-6

08/26/92

^ ENGINE - 5.0L - THRUST BEARING OR CRANKSHAFT PREMATURE WEAR - VEHICLES WITH AOD TRANSMISSION

^ NOISE - "METAL-TO-METAL" SOUND - 5.0L WITH AOD TRANSMISSION

^ TRANSMISSION - AOD - INTERFERENCE BETWEEN THE TORQUE CONVERTER AND THE FLYWHEEL BOLTS

FORD:
1982-88 THUNDERBIRD
1982-90 MUSTANG
1986 LTD
1987-90 CROWN VICTORIA

LINCOLN-MERCURY:
1982-87 CAPRI, CONTINENTAL
1982-88 COUGAR
1982-90 TOWN CAR
1984-90 MARK VII
1987-90 GRAND MARQUIS

LIGHT TRUCK:
1982-90 BRONCO, E-150, E-250, F-150, F-250

This TSB article is being republished in its entirety to include the 1982-1987 Continental and the 1982-1990 Town Car.

ISSUE:
An unusual "metal-to-metal" noise from the engine may be caused by the flexing of the torque converter. The flexing condition causes an interference between the torque converter and flywheel bolts. The interference can cause the thrust bearing and the crankshaft to wear prematurely and eventually fail.

ACTION:
Install six (6) new flywheel bolts with reduced head height to provide additional clearance. Refer to the appropriate Shop Manual, 5.0L Engine Section, for service details.

NOTE:
WHEN A CRANKSHAFT IS REPLACED DUE TO THRUST BEARING FAILURE, INSTALL A NEW CRANKSHAFT THAT HAS A REVISED PILOT HOLE. THIS WILL PROVIDE ADDITIONAL CLEARANCE FOR THE TOROUE CONVERTER. USE NEW FLYWHEEL BOLTS.





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Operation Description