Theory and applications of plane partitions: Part 1

An elongated cylindrical support member is provided and includes structure at its opposite ends for removable support of the support member from exhaust manifold mounting studs or bolts of the head of a reciprocating piston overhead valve combustion engine with the support member extending longitudinally of one side of the head. An elongated support arm has one end thereof mounted on the elongated support member for guided movement therealong and swinging movement of the support arm about the support member, the support arm being disposed at generally right angles to the support member. The other end of the support arm includes structure for releasable anchoring relative to the side of the associated cylinder head remote from the elongated support member with the support arm extending across the head and an intermediate portion of the support arm includes a window formed therethrough. The arm is slidable longitudinally of the elongated support member for registry of the window with a valve assembly of the head and a thrust member is supported from the support arm for guided movement along a path extending through the window formed in the support arm whereby the thrust member may engage a valve spring retainer and/or the adjacent end of the associated valve spring projecting through the opening in order to compress the valve spring while the associated valve is held in the closed position, thereby swinging the valve spring retainer keepers for removal and allowing disassembly of the valve spring and keeper from the corresponding valve preparatory to subsequent replacement of the valve stem seal.

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