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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 30 (Engine Mechanical - 5.7L) >> Overhaul >> Cylinder Head >> Valve Guides & Lifters

Valve Guides & Lifters

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Excessive valve stem-to-guide clearance may cause a noisy valve train, premature valve stem oil seal wear, component damage, and/or excessive engine oil consumption. Insufficient valve stem-to-guide clearance will result in noisy or sticking valves. Valves that are too tight may disturb engine smoothness or lead to component damage.
  1. Mark, sort, or organize the components for assembly. Clean the components in cleaning solvent. Dry the components with compressed air.
  2. Inspect the valve lifters for the following:
    • Bent or broken clip.
    • Worn pushrod socket.
    • Scuffed or worn sides If the valve lifter shows wear, inspect the engine block lifter bores for wear or damage.
    • Flat spots on the roller.
    • Loose or damaged pin.
    • Plugged oil hole.
    • Worn or damaged roller bearing The roller should rotate freely with no binding or roughness.
  3. Inspect the valve lifter guides for cracks or damage and excessive wear in the lifter mounting bores.
  4. Measure the valve stem-to-guide clearance using a dial indicator. See Fig 1. Valve stem-to-guide clearance may also be obtained by using a micrometer to measure the valve stem diameter and a ball type measuring gauge to measure the guide bore.
  5. A valve stem and guide with clearance in excess must be repaired or the components replaced. See CYLINDER HEAD SPECIFICATIONS  table.
  6. Inspect the valve stems for excessive scoring, wear, or warpage. A valve stem that has excessive scoring or wear must be replaced. A valve guide that is worn and has excessive stem-to-guide clearance should be reamed and valves with oversize stems installed
  7. Measure the valve stem diameter. Position the tip of the dial indicator at the top of the valve guide. If the valve stem diameter is within specifications, and the stem-to-guide clearance is excessive, the valve guide must be reamed oversize and a valve with oversize stem installed. See VALVES & VALVE SPRINGS SPECIFICATIONS  table.
  8. Ream the valve guide using the Valve Guide Reamer (J-37378-1). Clean the guide bore of all metal shavings and debris.
  9. Install the valve, with oversize stem, into the cylinder head. See Figure. Inspect the valve for proper fit. Move the valve back and forth in the guide. The valve should move freely with no resistance or drag.
Fig 1: Measuring Valve Stem-To-Guide Clearance
G00280567Courtesy of GENERAL MOTORS CORP.
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