C3.3 Industrial Engine Caterpillar

Perform this test in order to determine if a valve guide should be replaced.

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Illustration 1	g01235205
(A) Dial indicator group (1) Valve head (2) Valve guide (3) Radial movement of the valve in the valve guide (4) Valve stem

1. Place a new valve in the valve guide.

2. Place Tooling A with the magnetic base on the face of the cylinder head.

3. Lift the edge of the valve head (1) to a distance of 15.0 mm (0.60 inch).

4. Move the valve in a radial direction away from Tooling (A). Make sure that the valve moves away from Tooling (A) as far as possible. Position the contact point of Tooling (A) on the edge of the valve head (1). Set the position of the needle of Tooling (A) to zero.

5. Move the valve in a radial direction toward Tooling (A) as near as possible. Note the distance of movement which is indicated on Tooling (A). 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.