Engine Knock or Lifter Noise (Replace O-Ring)
| Subject: | Engine Knock or Lifter Noise (Replace O-Ring) |
| Models: | 2001-2002 Chevrolet Camaro |
| 2001-2003 Chevrolet Corvette |
| 2001-2002 Pontiac Firebird |
| 2002-2003 Cadillac Escalade, Escalade EXT |
| 2000-2003 Chevrolet Suburban, Tahoe |
| 2001-2003 Chevrolet Silverado |
| 2002-2003 Chevrolet Avalanche |
| 2000-2003 GMC Yukon, Yukon XL |
| 2001-2003 GMC Sierra |
| with 4.8L, 5.3L, 5.7L or 6.0L V8 Engine (VINs V, T, Z, G, S, N, U -- RPOs LR4, LM7, L59, LS1, LS6, LQ9, LQ4) |
Condition
Some customers may comment on an engine tick noise. The distinguishing characteristic of this condition is that it likely will have been present since new, and is typically noticed within the first 161-322 km (100-200 mi). The noise may often be diagnosed as a collapsed lifter. Additionally, the noise may be present at cold start and appear to diminish and then return as the engine warms to operating temperature. This noise is different from other noises that may begin to occur at 3219-4828 km (2000-3000 mi).
Cause
The O-ring seal between the oil pump screen and the oil pump may be cut, causing aeration of the oil.
Correction
Inspect the O-ring seal and replace as necessary. Use the applicable part number listed below. Refer to the Engine Mechanical sub-section of the appropriate Service Manual.
Parts Information
Part Number | Description | Qty |
|---|---|---|
12557752 | Seal-O/Pmp (O-ring) (F and Y Cars) | 1 |
12563963 | Seal-O/Pmp (O-ring) (C/K Trucks) | 1 |
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Usage | Labor Time |
|---|---|---|---|
J1060 | Pickup Tube and Screen - Replace | F Car | 3.7 hrs |
Y Car | 4.3 hrs | ||
C Truck | 1.3 hrs | ||
K Truck | 2.1 hrs |
