Abstract: An internal combustion engine including an air intake and a crank case, a positive crank case ventilation valve having a valve body, a cavity within the valve body, a first valve seat within the cavity, a second valve seat within the cavity and smaller than the first valve seat, a valve member within the cavity and configured to substantially close the cavity to the ambient and yet be movable therein to a position seated against both the valve seat and to a position spaced from the seond valve seat, a passage terminating at the second valve seat, a port terminating in the cavity between the first and second valve seats, a conduit extending between the passage and the air intake of the engine, and a conduit extending between the port and the crank case. The difference in areas of the two valve seats permits crank case pressure to be closely controlled.

Abstract: The invention is concerned with an improved exhaust system for a lift truck. The lift truck comprises an engine within an engine housing, an exhaust stack, an operator seat, an overhead structure above the operator defining an operators compartment and a plurality of forks or other load engaging means controllably moveable vertically adjacent a forward end of the truck. The improved exhaust system comprises a first conduit affixed at an upstream end thereof to the engine to receive exhaust gas flow therefrom, the first conduit ending at a nozzle at a downstream end thereof. A second conduit of larger cross section than the first conduit is aligned to receive the nozzle and to accept gas flow therefrom along with ambient air and conduct said gas flow and air to said exhaust stack, which stack forms a vertical support for said overhead structure.