Valve guide insert

  • US 5,249,555 A
  • Filed: 04/14/1992
  • Issued: 10/05/1993
  • Est. Priority Date: 04/14/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A valve guide insert for lining and relining a valve guide of an internal combustion engine, the engine including a valve having a valve stem which is to reciprocate in the bore of the valve guide, comprising:

  • a thin-walled, generally cylindrically shaped, metallic tube having ends and a section intermediate the ends, said intermediate section having an outer diameter substantially equal to or slightly greater than the inner diameter of the valve guide bore within which said insert is to be installed so that said insert, when positioned within said bore, will be retained by a press fit, said intermediate section of the insert having an inner diameter about equal to or slightly greater than the diameter of the valve stem which is to reciprocate therein, the inner and outer diameters of said intermediate section defining the approximate desired wall thickness of said insert when installation is complete; and

    at least one of said ends having a reduced inner diameter and a reduced outer diameter relative to said intermediate section, said at least one end providing a tapered insertion section adapted to lead said insert into the valve guide bore, said tapered insertion section having a wall thickness substantially equal to or slightly greater than the wall thickness of said intermediate section such that said tapered insertion section will not be prone to crush during installation of said insert into the bore, whereby said insert can be installed in a valve guide bore having a nonchamfered opening.

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