F 250 2WD Pickup V8-7.3L DSL (1990)
Flywheel: Customer Interest
Engine - Rough Idle/Rattle or Chatter Noise
Article No.
93-17-11
08/18/93
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IDLE - ROUGH - 7.3L DIESEL ENGINE - DUAL MASS FLYWHEEL RESONANCE - ENGINE SERIAL NUMBER BEFORE 1042741
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NOISE - "RATTLE" OR "CHATTER" - GEAR ROLLOVER NOISE WITH TRANSMISSION IN NEUTRAL AND CLUTCH PEDAL
DEPRESSED - VEHICLES WITH 7.3L DIESEL ENGINE, SERIAL NUMBER BEFORE 1042741
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TRANSMISSION - ZF MODEL S5-42 HD - NEUTRAL GEAR ROLLOVER NOISE - VEHICLES WITH 7.3L DIESEL ENGINE, SERIAL
NUMBER BEFORE 1042741
LIGHT TRUCK:
1987-93 F-250, F-350 1988-93 F SUPER DUTY, F-47, F-59
ISSUE:
The dual mass flywheel may go into resonance with the engine at idle speed, resulting in an objectionable noise and rough idle. Also, neutral gear
rollover noise may occur with the transmission in neutral and the clutch pedal released. This noise should go away when the clutch pedal is depressed.
When driving the vehicle at 1200 to 1700 RPMS, gear "rattle" or "chatter" noise and/or roughness may be objectionable in all or any gear. These
conditions are caused by the firing pulses of the engine setting off the transmission gears which results in a "rattle" noise.
ACTION:
If any of the subject issues are identified and verified, replace the flywheel and retaining bolts with the new dual hysteresis dual mass flywheel. The new
flywheel incorporates damping springs to absorb the engine pulses which excite the transmission gears and results in a quieter system or less gear
"rattle". Refer to the following procedure for service details.
NOTE:
THIS SERVICE ACTION SHOULD NOT BE PERFORMED ON VEHICLES WITH AN ENGINE SERIAL NUMBER GREATER THAN 1042741
SINCE PRODUCTION IMPLEMENTATION OF THE NEW DUAL HYSTERESIS DUAL MASS FLYWHEEL BEGAN WITH THIS SERIAL
NUMBER ENGINE.
1.
Inspect the flywheel dust cover as a source of the noise or vibration. Repair as required. If the dust cover is not the source of noise or vibration,
continue to Step # 2.
2.
Remove the flywheel and thoroughly clean the face of the crankshaft. Refer to the 1993 F-250/350 Powertrain/Drivetrain Service Manual, Section
03-01D-39 and 40, for the removal procedure.
NOTE:
THIS NEW FLYWHEEL HAS UP TO 6~ OF NORMAL LOOSE AXIAL ROTATION BETWEEN FIRST AND SECONDARY FLYWHEEL
SECTIONS.
CAUTION:
DO NOT REUSE ORIGINAL RETAINING BOLTS WITHOUT COATING BOLT THREADS WITH FORD THREADLOCK AND SEALER
(EOAZ-19554-AA) OR EQUIVALENT. THIS PREVENTS OIL SEEPAGE TO THE FLYWHEEL WHICH CAUSES DAMAGE TO THE
ASSEMBLY.
3.
Install the new flywheel (F2TZ-6477-B). Use new bolts (E7TZ-6379-A) or the original bolts with FORD threadlock and sealer
(EOAZ-19554-AA) re-applied. Refer to the 1993 F-250/350 Powertrain/Drivetrain Service Manual, Section 03-01D-39 and 40, for the installation
procedure.
Parts Block
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS:
Eligible Under Bumper To Bumper For 1992/93 Models, Powertrain Warranty Coverage For All Other Models
