| 摘要 |
A device for accurately positioning and automatically aligning correctly each guide sleeve within a bore of a cylinder head includes a hemispherical base section having a flat lower surface which is positioned on the bed of a press, and an upper hemispherical surface which accurately aligns a valve seat thereon during forcible insertion of the guide sleeve into the bore, and a guide rod secured centrally to the upper hemispherical surface for insertion in the respective bore to accurately guide the guide sleeve which is force fit into the respective bore. The method according to the present invention includes the steps of heating the cylinder head, positioning the base section on the bed of the press; placing the heated cylinder head over the device so that a valve seat thereof is seated on the upper hemispherical surface and the guide rod is inserted through the respective bore corresponding to the valve seat; positioning the guide sleeve over the guide rod that protrudes above the cylinder head; forcing the guide sleeve into the respective bore with a friction fit and over the guide rod; wherein the force applied to the guide sleeve is transmitted to the cylinder head so that the valve seat is automatically aligned correctly on the arcuate surface and the guide sleeve will then be accurately inserted in the respective bore.
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