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Home >> Geo >> 1994 >> Prizm Base, Standard >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 1.6L 4-CYL - VIN [6] & 1.8L 4-CYL - VIN [8] >> Adjustments >> Valve Clearance Adjustment

Valve Clearance Adjustment

NOTE: Adjust valve clearance with engine cold.
  1. Disconnect negative battery cable. Disconnect all necessary control cables, hoses and electrical connections. Remove valve cover and gasket.
  2. Rotate crankshaft so No. 1 cylinder is at TDC of compression stroke. Ensure timing mark on crankshaft pulley aligns with "0" mark on timing belt cover.
  3. Using feeler gauge, check clearance between camshaft lobe and adjusting shim for the following: all valves on No. 1 cylinder, intake valves on No. 2 cylinder and exhaust valves on No. 3 cylinder. Record all readings.
  4. Rotate crankshaft 360 degrees. Check clearance between camshaft lobe and adjusting shim for the following: all valves on No. 4 cylinder, intake valves on No. 3 cylinder and exhaust valves on No. 2 cylinder. If clearance is not within specification, adjust by replacing adjusting shim. See VALVE CLEARANCE SPECIFICATIONS table.
    VALVE CLEARANCE SPECIFICATIONS

    Application Clearance: In. (mm)
    Exhaust (1) .010-.014 (.25-.35)
    Intake (1) .006-.010 (.15-.25)
    (1) Adjust valve clearance with engine cold.
  5. Rotate engine until camshaft lobe faces away from valve to be adjusted. Insert Valve Spring Depressor (J-37141-1) between camshaft and adjusting shim. See Fig 1 .
  6. Install Valve Lash Spring Spacer (J-37141-2A) between camshaft and valve lifter. Ensure bottom edge of valve lash spring spacer contacts valve lifter, NOT adjusting shim. Remove valve spring depressor. Using small screwdriver and magnet, remove adjusting shim from valve lifter.
    Fig 1: Adjusting Valve Clearance
    G91G00410Courtesy of GENERAL MOTORS CORP.
  7. To determine correct adjusting shim thickness for shim replacement, measure and record thickness of removed shim. Locate measured values of removed shim and valve clearance on appropriate adjusting shim selection chart to determine correct shim thickness. See Fig 2 and Fig 3 .
  8. Install correct shim thickness to obtain proper clearance. See VALVE CLEARANCE SPECIFICATIONS  table. Repeat procedure if necessary. Before installing valve cover, apply Sealant (1052751) at valve cover-to-camshaft bearing cap and cylinder head surfaces. Install valve cover in reverse order of removal.
Fig 2: Exhaust Valve Adjusting Shim Selection Chart
G93F82151Courtesy of GENERAL MOTORS CORP.
Fig 3: Intake Valve Adjusting Shim Selection Chart
G93G82152Courtesy of GENERAL MOTORS CORP.
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