2001-2003: Service Bulletin: Engine Knock or Lifter Noise
04-10-2003, 11:36 PM
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2001-2003: Service Bulletin: Engine Knock or Lifter Noise 2001-2003: Service Bulletin: Engine Knock or Lifter Noise
Subject: Engine Knock or Lifter Noise (Replace O-Ring)
Model and Year:
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)
Source: Chevrolet Service Bulletin
Bulletin Number: 02-06-01-038 - (12/02/2002)
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
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.
© Copyright General Motors Corporation. All Rights Reserved.
--------------------------------------------------------------------------------
Related Forum: 1997-2003 Technical Discussion
User Comments
2001-2003: Service Bulletin: Engine Knock or Lifter Noise
Subject: Engine Knock or Lifter Noise (Replace O-Ring)
Model and Year:
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)
Source: Chevrolet Service Bulletin
Bulletin Number: 02-06-01-038 - (12/02/2002)
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
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.
© Copyright General Motors Corporation. All Rights Reserved.
--------------------------------------------------------------------------------
Related Forum: 1997-2003 Technical Discussion
User Comments
2001-2003: Service Bulletin: Engine Knock or Lifter Noise
04-11-2003, 05:36 PM
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Re: 2001-2003: Service Bulletin: Engine Knock or Lifter Noise LOL, I just had that replaced under the warranty.. I've had my engine replaced once and now the O-Ring. Still sounds the same <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />
04-11-2003, 10:22 PM
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Re: 2001-2003: Service Bulletin: Engine Knock or Lifter Noise My motor ticks like a b#$&H!! Seems to have gotten worse with the long tubes. Thought I might have a exhaust leak but could not find anything. Seems to run fine though, just noisy. <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
04-11-2003, 10:43 PM
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Re: 2001-2003: Service Bulletin: Engine Knock or Lifter Noise Engine in mine has what sounds like piston slap. Has had since new-definately from bottom end. Then today I was noticing a tick once my engine was warmed up. I guess I'll keep an eye on it. I work at a GM dealer. One of the guys replaced an oil pump O-ring for tick noise in an Escalade a while ago. I don't think the truck has come back for same problem yet. I saw the o-ring. It wasn't cut. Looked like was sort of deformed/rolled. Looks like I'll get to do the warranty work on my own car if it gets any worse (can't wait...) Oh yeah, that was a tick on top of the other noise.
04-12-2003, 07:44 AM
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Re: 2001-2003: Service Bulletin: Engine Knock or Lifter Noise Mine makes those sounds too....and at about those miles. Still does, but I just had the oil pump off when doing my timing chain and cam install, and the o-ring was fine. Still makes the sound now, just magnified with the 918 springs. I'm not worrying about it at 22k miles.--Car is very strong!
