BOLT 8C8451 - Caterpillar

Introduction
This procedure is intended to give information on inspection the valve guide.Perform this test in order to determine if a valve guide should be replaced. Required Tools
Table 1
Required Tools
Part Number Part Name Qty
8T-5096 Dial Indicator Group 1 Check Procedure
Illustration 1 g00986821
(1) Valve guide
(2) Radial movement of the valve in the valve guide
(3) Valve stem
(4) Dial indicator
(5) Valve head
Place a new valve in the valve guide.
Place the dial indicator with the magnetic base on the face of the cylinder head.
Lift the edge of the valve head to a distance of 15.0 mm (0.60 inch).
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.
Move the valve in a radial direction toward the dial indicator as far as possible. Note the distance of movement which is indicated on the dial indicator. If the distance is greater than the maximum clearance of the valve in the valve guide, replace the valve guide.
When new valve guides are installed, new valves and new valve seat inserts must be installed. Valve guides and valve seat inserts are supplied as an unfinished part. The unfinished valve guides and unfinished valve seat inserts are installed in the cylinder head. Then, the valve guides and valve inserts are cut and reamed in one operation with special tooling
Refer to Specifications, "Cylinder Head Valves" for the maximum clearance of the valve in the valve guide.