Engine - Oil Pan R&R May Cause Oil Pump Housing Damage

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Bulletin No.: T-92-65A
File in Group: 6
Number: 20
Corp. Ref. No.: 216001R
Date: June, 199Z


SUBJECT:
OIL PAN REMOVAL MAY CAUSE OIL PUMP HOUSING
DAMAGE ON 4.9L (VIN B) ENGINES. REVISED PROCEDURE TO
UPDATE SERVICE INFORMATION MANUALS - SECTION 6A

MODELS AFFECTED:
1991-1992 DE VILLES, FLEETWOODS, ELDORADOS, SEVILLES


This bulletin supersedes T-92-65 which should be discarded. This bulletin is being revised to add a "T" operation for grinding the oil pan to provide proper clearance on assembly.

When removing the oil pan on 4.9L engines, the edge of the oil pan gasket surface may bind against the transaxle housing near the engine flywheel. If a binding condition exists,it is necessary to loosen the oil pump mounting flange and screws (2) from engine to block to allow for unrestricted oil pan removal.

NOTE:
Prying on the oil pan can damage the oil pump housing at the mounting flanges.

The following procedure should be used when removing the engine oil pan. This procedure supersedes the steps listed in the applicable Service Information Manuals.

1. Disconnect the negative battery cable.

2. Raise car.

3. Remove oil drain plug and drain oil.





4. Remove two plastic flywheel covers. Refer to Figure 1.


5. On Eldorados and Sevilles remove the exhaust cross-under pipe.

6. Remove oil pan bolts and lower the pan until the edge of the pan contacts the transaxle housing near the flywheel.





7. Loosen the oil pump mounting flange and screws (2) from engine block, do not remove. Refer to Figure 2.


8. Carefully pry down 1/8" on oil pump supply tube then remove the oil pan.

9. If removing oil pan only, check the position of the pump's outlet pipe O-ring and seat if necessary. Retorque the pump to block with two screws (20 N-m/15 lbs.ft.).





10. Grind 1.5 mm (1/16") from the two points on the edge of the oil pan where the binding condition was noted. Refer to Figure 3.

To reassemble install the oil pan and perform steps 1-6 in reverse order after solvent and alcohol cleaning both oil pan and block pan rail surfaces.

NOTE:
It is necessary to grind the oil pan for proper clearance on assembly. Once a pan has been modified for clearance it is not necessary to loosen the oil pump if subsequent oil pan removal is required. For this operation use T6661 at .2 hour.

For warranty purposes use Labor Operation J1000 at 1.6 hours on DeVilles and Fleetwoods or 1.8 hours on Eldorados and Sevilles.