Method and system for measuring interference between valve and piston of an internal combustion engine
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United States of America Patent
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Jun 25, 2002
Grant Date -
Sep 6, 2001
app pub date -
May 4, 2001
filing date -
Oct 15, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A method for measuring interference between a valve and a piston, includes the steps of measuring a standard torque value, related to camshaft distortion caused by engine RPM, through voltage detecting means; measuring torsional distortion deviation of a crankshaft and an injection pump shaft by fixing the camshaft and forcibly rotating the crankshaft by said standard torque value; measuring vibration generated when the camshaft, the crankshaft, and the injection pump shaft are rotated, and measuring a crankshaft rotational angle to detect a piston TDC position, both measurements being conducted at a predetermined level of engine RPM; displaying piston and intake/exhaust valve movement on a graph at the piston TDC position after analyzing torsional distortion deviation and vibration of each shaft; and determining whether there is interference between the intake/exhaust valve and the piston by comparing design values with that displayed on the graph.
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