For 1990-2009 cars

# SERVICE MANUAL UPDATE SEC.6A6- SERVICE PROCEDURES

#### VEHICLES AFFECTED: 1989-90 "N" CAR WITH 3300 (LG7)

This Bulletin contains two service procedures. The first is a procedure for removing the Serpentine Belt Tensioner. This procedure was omitted from the 1989 and 1990 Service Manual. The second is a revised service procedure for removing the front cover.

PROCEDURE FOR SERPENTINE BELT TENSIONER REPLACEMENT

Tools Required: J28467 Support Fixture

REMOVE OR DISCONNECT

1. Negative Battery Cable 2. Drain Coolant 3. Radiator and Heater Hoses 4. Two Generator Wires 5. Serpentine Belt 6. Two Generator Bolts 7. Power Steering Pump 8. Raise Vehicle and Suitably Support, see Section OA 9. Right Front Wheel 10. Right Drive Axle, see Section 4D 11. Support Engine using J28467 12. Engine Mounts 13. Raise Engine for Clearance 14. Belt Tensioner

INSTALL OR CONNECT

To complete installation - reverse the removal procedure.

PROCEDURE FOR FRONT COVER REPLACEMENT

Tools Required: J28467 Support Fixture J37087 Crankshaft Sensor Adjuster J37096 Flywheel Holding Tool

REMOVE OR DISCONNECT

1. Negative Battery Cable 2. Serpentine Belt Tensioner 3. Inner Fender Splash Shield 4. Torque Converter Cover 5. Hold Flywheel with J37096 6. Crankshaft Balancer Bolt 7. Balancer 8. Electrical Connections at CAM Sensor, Crank Sensor and Oil Pressure Sender 9. Oil Pan Bolts and Oil Pan 10 .Front Cover Attaching Bolts and Cover

INSPECT

Timing chain for overall "in and out" movement. Should not exceed 25.4mm (one inch). Sprockets for wear.

CLEAN

Gasket mating surfaces at timing chain cover, and cylinder block.

If oil pan gasket is excessively swollen, the oil pan must be removed and the gasket replaced.

INSTALL OR CONNECT

1. Front Cover Gasket

2. Front Cover and Attaching Bolts

Apply Sealant GM P/N 992545 or Equivalent to Bolt Threads Tighten Bolts to 30 N.m (22 ft. lbs.)

3. Oil Pan

Tighten Bolts to 10 N.m (88 in. lbs.)

4. Electrical Connections

5. Adjust Crank Sensor Using J37087

6. Balancer and Bolt

Hold Flywheel with J37096 Tighten Bolt to 297 N.m (219 ft. lbs.)

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.