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Hi everyone,

My dad has a 2002 6.0L with 88,000 miles on it. The truck has recently developed at ticking noise that is coming from the lower end. When we put the scope (electronic ears) on it, the tick sounds like a rod or main bearing. Although, mechanics are telling us its a roller tip rocker or a roller lifter. This is hard to believe because this sound sounds so much like a rod or main bearing going south. When we put the truck under a brake torque of about 1,500 rpm to 2,000 rpm the noise goes away. The noise seems to come from right under the harmonic balancer. Anybody else experience this problem? Have any ideas to help us in the right direction??

Thanks

Billetman
 

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Hi everyone,

My dad has a 2002 6.0L with 88,000 miles on it. The truck has recently developed at ticking noise that is coming from the lower end. When we put the scope (electronic ears) on it, the tick sounds like a rod or main bearing. Although, mechanics are telling us its a roller tip rocker or a roller lifter. This is hard to believe because this sound sounds so much like a rod or main bearing going south. When we put the truck under a brake torque of about 1,500 rpm to 2,000 rpm the noise goes away. The noise seems to come from right under the harmonic balancer. Anybody else experience this problem? Have any ideas to help us in the right direction??

Thanks

Billetman
Below is a Service Bulletin......Clicking/Ticking and/or Piston Slap on the Silverado's and other G.M Vehicles,it may or may Not apply to the Ticking Noise you have mentioned coming from your Engine,

File In Section: 06 - Engine/Propulsion System......Bulletin No.: 02-06-01-038
Date: December, 2002

Subject:......Engine Knock or Lifter Noise (Replace 0-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 0-ring seal between the oil pump screen and the oil pump may be cut, causing aeration of the oil.

Correction,
.......Inspect the 0-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.
 

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or worst case it could be a bad rist pin too. Hopefuly just that o-ring though an probably is.
 
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