Evaporable foam pattern for casting a thermostat housing for a V-type marine engine

Claim 1

An evaporable foam pattern for casting a thermostat housing for a four-stroke, V-type marine engine, comprising: a housing pattern defining a first chamber, a second chamber and a third chamber; first inlet means in said housing pattern and communicating with the first chamber for admitting a coolant from an engine block to the cast housing; aperture means providing communication between said first and second chambers and bordered by an annular surface adapted to support a thermostat valve in the cast assembled housing; outlet means communicating with said first chamber and adapted to discharge said coolant to the engine block; a pair of first outlets each connected with the second chamber for discharging coolant; a pair of second outlets communicating with the third chamber for discharging coolant; second inlet means connected to the third chamber for supplying sea water to said third chamber; port means providing communication between said third chamber and said outlet means; the axes of said first outlets being disposed in a first plane and the axes of the second outlets being disposed in a second plane parallel to and offset from said first plane; the axis of said inlet means and the axis of said outlet means disposed in a third plane parallel to and offset from said first and second planes; said housing pattern composed of three pattern sections, including a first pattern section and a second pattern section having abutting surfaces disposed along a first parting line that lies in said second plane, said pattern also including a third pattern section, said second and third pattern sections having abutting surfaces disposed along a second parting line that lies in said first plane; and joining means for joining the abutting surfaces of said first and second pattern sections together and for joining the abutting surfaces of said second and said third pattern sections together.