Timing gage

Claim 1

A dial gage support for use with a dial gage having a mounting flange and a feeler member movable through said flange useful in timing different internal combustion engines characterized by spark plug holes entering cylinders in different directions with respect to a piston which comprises: a dial gage support arm comprising a first end portion and a second end portion, said first end portion containing a dial gage flange accepting hole therethrough and said second end portion containing an angle adjustment slot therethrough; an arm-carrying member including toward a first end thereof fastening means extending through said angle adjustment slot and at a second end thereof a mounting flange said dial gage mounting flange and said arm-carrying member mounting flange being the same size; and an adaptor with a hole extending longitudinally therethrough, said hole at one end of said adaptor being of a size to accommodate seatingly said mounting flange and said dial gage flange and being throughout of size to pass said feeler member, said adaptor carrying male screw threads of the same size as a spark plug threads at the other end thereof, and said adaptor including toward said other end thereof a longitudinally extending slot, said slot extending through one wall of said adaptor from the outside thereof and communicating with said hole in said adaptor; whereby, when a spark plug hole enters a cylinder at an angle an engine may be timed by screwing in said adaptor, securing said armcarrying member in said holE in said adaptor at one end thereof, moving said dial gage support arm relative to said arm-carrying member a variable amount depending on the said angle involved until the dial gage, mounted in said accepting hole, has said tip extending in the same direction as the axis of the cylinder, and through said slot in said adaptor and out the open other end of said adaptor, and securing this relationship through said fastening means, and when a spark plug hole enters a cylinder with both the spark plug hole and the cylinder extending in the same direction an engine may be timed by mounting said dial gage flange directly in said first end of said adaptor, said tip extending longitudinally through said adaptor, whereupon in all the instances specified a direct reading of distance in relation to cylinder top dead center may be had with accuracy and simplicity.