C 3500 Truck 2WD V8-8.1L VIN G (2001)
Rocker Arm Assembly: Customer Interest
Engine - Ticking Noise/Loss of Power
File in Section: 06 - Engine/Propulsion System
Bulletin No.: 01-06-01-018
Date: July, 2001
TECHNICAL
Subject:
Engine Tick Noise at Valve Train Speed/Loss of Power
(Replace Push Rod)
Models:
2001 Chevrolet and GMC C/K and G Light Duty Models
2001 Chevrolet and GMC B7, C6, C7 Medium Duty Models
with 8.1 L Engine (VINS E, G - RPO L18)
Condition
Some owners may comment on a ticking noise in the upper end of the engine. The noise is constant and does not vary with engine RPM. A loss of power
may be noticed.
Cause
The push rods may have been damaged from improper contact with the rocker arms.
Correction
The engines affected have engine build numbers from T10104 to T10412. The identification labels are located on the left front and right rear of the
rocker arm covers, and on the fluid pan. If the engine falls within the range above, inspect the push rod rocker arm end for cracks in the shaft (below the
weld joining the ball to the shaft) and/or dislocation of the ball from the shaft. All of the push rods are to be replaced if any of them are damaged.
Replace the rocker arms only if they have been damaged from contact with the push rod or a dislocated ball. Refer to the Service Manual procedure for
push rod and rocker arm removal and replacement.
Parts Information
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use the table.
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