SENR9977 41 Testing and Adjusting Section i01889422 Valve Depth - Inspect 3. Inspect the valves for cracks and other damage. Check the valve stems for wear. Check that the valve springs are the correct length under the test force. Refer to Specifications, “Cylinder Head Valves” for the dimensions and tolerances of the valves and the valve springs. Table 4 i01938952 Valve Guide - Inspect Perform this inspection in order to determine if a valve guide should be replaced. g00983531 Illustration 48 Measurement of the valve depth (1) 21825617 Dial gauge (2) 21825496 Dial gauge holder 1.
Use the dial gauge (1) with the dial gauge holder (2) to check the depths of the inlet valves and the exhaust valves below the face of the cylinder head. Use the cylinder head face (3) to zero the dial gauge (1). g00986821 Illustration 49 (1) Valve guide (2) Radial movement of the valve in the valve guide (3) Valve stem (4) Dial indicator (5) Valve head 2. Position the dial gauge holder (2) and the dial gauge (1) in order to measure the valve depth. Measure the depth of the inlet valve and the exhaust valve before the valve springs are removed. 1. Place a new valve in the valve guide. 2. Place a suitable dial indicator with the magnetic base on the face of the cylinder head.
Refer to Specifications, “Cylinder Head Valves” for the minimum, the maximum, and the service wear limits for the valve depth below the cylinder head face. 3. Lift the edge of the valve head to a distance of 15.0 mm (0.60 inch). 4. Move the valve in a radial direction away from the dial indicator. Make sure that the valve moves away from the dial indicator as far as possible. Position the contact point of the dial indicator on the edge of the valve head. Set the position of the needle of the dial indicator to zero. If the valve depth below the cylinder head face exceeds the service limit, use a new valve to check the valve depth.
If the valve depth still exceeds the service limit, renew the cylinder head or renew the valve seat inserts (if equipped). If the valve depth is within the service limit with a new valve, renew the valves. Required Tools Part Number Part Description Qty 21825617 Dial gauge 1 21825496 Dial gauge holder 1