High Oil Consumption (Replace Intake Manifold Bolts)
| Subject: | High Oil Consumption (Replace Intake Manifold Bolts) |
| Models: | 2002 Chevrolet Avalanche |
| 2001-2002 Chevrolet Silverado, Express, Suburban |
| 2001-2002 GMC Sierra, Savana, Yukon XL |
| 2001-2002 Chevrolet and GMC C6-7 Conventional Cab Medium Duty and B7 School Bus Models |
| with 8.1L Engine (VINs G, E -- RPO L18) |
Condition
Some customers may comment about higher than expected oil consumption. Because this type of engine is used under various load conditions, the dealer should verify that the vehicle is using more than 0.946L (1 quart) of oil for every 379L (100 gallons) of fuel used.
Cause
Oil vapor pulled into combustion chamber through the intake manifold may cause this condition.
Correction
Replace all the intake manifold bolts. Replace one bolt at a time in sequence to keep the intake manifold from shifting.
- In the order shown below, remove each bolt and replace with a new bolt. Insert the new bolt and tighten to 5 N·m (44 lb in). Then move to the next bolt in sequence until all bolts have been replaced.
- After all of the bolts have been replaced, tighten each bolt in sequence to 8 N·m (71 lb in).
- Tighten all bolts in sequence to a final torque of 12 N·m (106 lb in).
Notice: Ensure the intake manifold does not shift as the intake manifold bolts are tightened in the proper sequence. Failure to follow the entire intake manifold bolt tightening sequence exactly may result in an oil leak and serious engine damage.
Parts Information
Part Number | Description | Qty |
|---|---|---|
12561518 | Bolt, Intake Manifold | 10 |
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Models | Labor Time |
|---|---|---|---|
J0290 | Bolts, Intake Manifold - Tighten or Replace | C/K, C6-7, B7 | 0.7 hr |
G Van | 1.5 hrs |
