Jack. A tool to lift or move a heavy object. Also a tool to turn
the flywheel to a desired position.
Jacket. The outer casing forming a space around an engine cylinder
that permits circulation of cooling water.
Jerk pump. A fuel pump which injects fuel into the cylinder by action
of a cam having a sharp nose.
Jet. A small orifice used to control the flow of fuel or air. Also
the stream of fuel or air coming from such an orifice.
Journal. The finished part of a shaft that rotates in a bearing.
Jumper. A water-pipe connection between a cylinder head and the cylinder
jacket or the water-jacketed exhaust manifold.
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