Cylinder Head Valve Guide Wear Check

Perform the following operations

Perform the following operations:

note
Do not remove the valve or valve stem seal.
  1. Position the valves so that the valve stem ends are level with the valve stem seal (the valves must remain in this position for the duration of the test).
    2. HD Valve Stem Ends

    1. Valve stem ends

    2. Valve stem seals

  2. Complete each step below for each valve in the cylinder head.
    3. note
    Excessive force must not be used when measuring the valve guide wear. Excessive force will bend the valve stem and give a false reading.
  3. The valve should be gently rocked to one side of the valve guide in line with the camshaft.
    4. note
    A flat ended contact point must be fitted to the dial gauge.Ensure the dial gauge is level and is in line with the directional movement of the valve being checked.
  4. Secure a dial gauge to the cylinder head such that the clamping device will not damage any of the cylinder head surfaces.
  5. Position the dial gauge to the valve head on the opposite side to where the valve has made contact to the valve guide, as shown in the illustration below.
    6. HD Valve Wear Check Fig 2

    1. Dial gauge

    2. Flat ended contact point

    3. Direction valve rocked to valve guide

  6. Zero the dial gauge.
  7. Gently rock the valve to the opposite side of the valve guide in line with the camshaft and note the reading on the dial gauge.
  8. Repeat steps 3 to 7 but with the rocking of the valve head at 90° to the original measurement, as shown in image below. Note the reading on the dial.
    9. HD Valve Wear Check Fig 3

    1. Dial gauge

  9. The maximum movement of the valve in either direction must be less than 0.96 mm.
note
Due to the methods used to assemble the valve guides, these parts cannot be replaced. If the maximum movement of the valve exceeds 0.96 mm in either direction, the cylinder head must be replaced.

Perform the following operations

Perform the following operations: