F 350 4WD Pickup V8-7.3L DSL (1988)
Flywheel: All Technical Service Bulletins
Engine - Vibration and Rattle At Idle
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CLUTCH - DUAL MASS FLYWHEEL - DAMPER
DAMAGE AND NOISE
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IDLE - VIBRATION AND RATTLE - 6.9L AND 7.3L DIESEL ENGINE WITH A SERIAL NUMBER LESS THAN 509511 AND A
M50D MANUAL TRANSMISSION
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NOISE - IDLE VIBRATION AND RATTLE - 6.9L AND 7.3L DIESEL ENGINE WITH A SERIAL NUMBER LESS THAN 509511 AND
A M50D MANUAL TRANSMISSION
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FLYWHEEL - DUAL MASS DAMPER DAMAGE AND NOISE
Article No. 88-23-16
LIGHT TRUCK:
1987-88 F-SERIES
ISSUE:
A vibration and rattle at engine idle may be caused by the incompatibility of the fuel injection pump governor and the dual mass flywheel.
Replacing the dual mass flywheel will temporarily fix the condition for about 1000 to 2000 miles (1609 to 3218 kilometers), but not
completely resolve the idle concern.
ACTION:
Use the following diagnostic procedure to determine if replacement of the fuel injection pump and/or dual mass flywheel is necessary.
NOTE:
The 6.9L and 7.3L Engine Performance (E.P) Chart must be used with this TSB article. Only complete the steps on the E.P Chart outlined
below. Prior to performing this TSB, the vehicle must be running acceptably except for idle quality. If other performance related concerns are
noted, complete the entire Engine Performance Chart before performing this TSB.
1.
Complete step 3A (Check for air in fuel) of the 6.9L or 7.3L Engine Performance Chart and record the results on the form (FPS-8433C for 6.9L or
FPS-8512 for the 7.3L). Diagnose and correct any air leaks found before proceeding. Refer to Engine Emission Diagnosis Shop Manual, Volume
H for service details.
NOTE:
Small air leaks can cause an irregular engine miss which will result in the second mass of the dual mass flywheel impacting the stop, producing
a severe idle vibration.
2.
Complete step 9 (Low idle rpm) of the 6.9L or 7.3L Engine Performance Chart and record the results on the form. If necessary, reset the idle speed
to 650-700 engine RPM, when measured on a warm engine with all accessories off and the engine in neutral.
3.
If the idle vibration has not been corrected by steps 1 and 2 of this TSB, replace the fuel injection pump and set timing per the Light Truck Shop
Manual. Record "Fuel Injection Pump replaced per TSB 88-23-16" on both the warranty claim and the Engine Performance Chart comment line.
Revised fuel injection pump part numbers for the 6.9L diesel have been issued. All service fuel injection pumps incorporate the revised governor
cage clearance. Only the following revised fuel injection pumps should be used to service 1987 6.9L and 7.3L diesel engines equipped with M50D
manual transmissions.
APPLICATION
PART NUMBER
1987 6.9L Low Altitude 50 state with M50D
E7TZ-9A543-A
1987 6.9L High Altitude with M50D
E7TZ-9A543-B
1987 7.3L Low Altitude 50 state with M50D
E8TZ-9A543-C
1987 7.3L High Altitude with M50D
E8TZ-9A543-D
NOTE:
Warranty claims for the injection pump will not be accepted unless all tamper resistant seals are intact and the completed engine performance
chart is submitted with the returned fuel injection pump.
4.
If the condition still exists, remove the transmission and clutch per the Light Truck Shop Manual. Inspect the dual mass flywheel for damper
damage or oil leakage at the crankshaft bolts.
NOTE:
Removal of the clutch housing dust cover is not sufficient to detect damper damage or oil leakage. Leakage will result in dual mass flywheel
malfunction long before it can be detected by inspection through the dust cover opening.
If leakage from the flywheel to crankshaft attaching bolt area or damper damage is suspected, remove and replace the flywheel per the Light Truck Shop
Manual. Replace the flywheel to crankshaft attaching bolts taking care to seal the bolt threads with Perfect Seal Sealing Compound (B5A-19554-A).
Install bolts, tightening them to specification 47 ft.lbs. (64 N-m) and alternating across from each other. Reassemble clutch and transmission per the
Light Truck Shop Manual.
PART NUMBER
PART NAME
CLASS
