| 摘要 |
A thin-walled valve guide insert (10) for lining and relining a valve guide of an internal combustion engine includes opposing ends each having a tapered insertion section (24,26) thereon. The tapered insertion section defines a reduced outer diameter to facilitate installing the insert into a valve guide bore have a nonchamfered opening, and further defines a reduced inner diameter so that the insert has a substantially continuous wall thickness throughout its length and thus maintains the structural integrity of the insert from end to end. The insert includes a lengthwise slit (18). The insert is sprung open longitudinally along the slit and must be radially compressed so that the insert defines a sufficiently small outer diameter so that it can be axially installed in a press-fit condition into the valve guide bore of the engine. The insert is inserted by a driver tool (70) including an outwardly tapered junction (82) adapted to spread one (26) of the tapered insertion sections (24,26) of the insert into longitudinal alignment with the insert to reduce the tendency to crush same from end forces exerted on the insert while installing the insert into the valve guide. <IMAGE> |
