SHAFT-PUMP 1171909 - Caterpillar

--------------- END SUPPLEMENT ---------------When valve guides are replaced in a cylinder head for the third or fourth time, the guide bore in the head becomes oversized. This causes the normal press fit of the guide in the bore to become inadequate to retain the guide. Valve seat inserts become loose after "working" in the cylinder head bore.
An oversized insert can be used to salvage the cylinder head casting. See chart. This allows dealers to salvage cylinder heads using Caterpillar parts. Parts, as shown in the following chart, are available for all Caterpillar diesel and spark ignited engines, except the 3200, 3500 and 3600 families of engines.