CAMSHAFT 20R2927 - Caterpillar

When an improved cylinder head is used, it will be necessary to use either a new valve cover as shown in the chart, or modify the former valve cover. The lip on the former valve cover must be removed between points A and B as shown in the illustration to allow the valve cover to seal correctly on the cylinder head. Remove 2.5 mm (.10") of the lip from the valve cover. Put a 15.8 mm (.62") radius (four locations) at each end where the lip of the valve cover was removed. Make sure there are no sharp edges and that the valve cover is thoroughly cleaned after the valve cover is modified.
Dimensions for modification to former valve cover.