GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Vivant 🢒 Engine 🢒 Engine Mechanical - 1.6L 🢒 Valve Guide Reaming, and Valve and Seat Grinding

Tools Required

    • KM-571-B Gage
    • KM-340-1-C Guide Drift

    Object Number: 1289664 Size: SH
  1. Lubricate the valve stem using a fine-grained paste.
  2. Lift the valve rhythmically from the seat with a commercially available valve grinding tool in order to distribute the paste.

    3. Object Number: 1289666 Size: SH
  3. Check the contact pattern on the valve head and in the cylinder head.

    4. Caution: Refer to Safety Glasses Caution in the Preface section.

  4. Clean the valves, the valve guides, and the cylinder head.

Valve Grind


    Object Number: 1289667 Size: SH
  1. Ensure that there are no crater line burns on the valve cone.
  2. The valve may be reground only two times. Do not grind the valve stem end.
  3. The angle at the valve face is 45 degrees.
  4. Inspect the assembly height of the intake valves and the exhaust valves.

Valve Guide - Ream


    Object Number: 1372423 Size: SH
  1. Measure the diameter of the valve guide using KM-571-B and a commercially available inside micrometer.

    2. Object Number: 1289669 Size: SH

    Important: Value oversizes may already have been fitted in production.

  2. An oversize service code is on the valve guide and the valve stem end. The Valve Guide Reaming Table will give the correct size, reamer, and production codes for each service. Refer to the Engine Mechanical Specifications .
  3. Ream the valve guide from the upper side of the cylinder head to the next oversize.
  4. After reaming, cross out the code and emboss the valve guide with the new code.

Valve Seat - Cut


    Object Number: 1289670 Size: SH
  1. Place the cylinder head on wooden blocks.
  2. Cut the intake and the exhaust valve seats using the KM 340-7 included in the KM-340-1-C as follows:
    3. • Valve seat-A 45-degree surface using KM 340-13 included in the KM-340-1-C .
    • Upper Correction angle-A 30-degree surface using KM 340-13, included in the KM-340-1-C .
    • Lower correction angle - A60- degree using KM 340-26 included in the KM-340-1-C .
  3. Clean the chippings from the cylinder head.
  4. Inspect the dimension for the valve seat width.

    5. Specifications

        • Intake: 1.17 to 1.57 mm (0.046 to 0.062 inch).
        • Exhaust: 1.4 to 1.8 mm (0.055 to 0.071 inch).
  5. Inspect the assembly height of the intake valves and the exhaust valves. If the dimension is exceeded, install new valves. Inspect the assembly height of the intake valves and the exhaust valves again. If the valve assembly height is still too large despite replacing the valves, replace the cylinder head.