1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 44Get this manual
GYLINDER AD GYLIND R
ARMATUR LA SUPPOR
dowel pinbearing at the bottom journal absorbs the radial and vertical thrust loads of the crankshaftCOOLING SYSTEM Water for engine cooling is supplied singlestage TIC" containing impellerAt low speeds, the operates fuH displacement At higher speeds, the imblades bend back under the increased water pressure and the becomes centrifugal acti on See Figure 5-3
GYLIND BLOGK
Figure 5-2 Power Head, Starboard Side CONNECTING RODS The connecting rods provide linkage between the piston and crankshaftConnecting rod bearings include bearing at the wrist pin, and split cage bearing at the crankshaftThe crankshaft is of tlle two-throw type and is supported three main bearingssingle row bearing is used at the journalsplit cage bearing at the Cej,lter journal is aligned to the cylinder block
TH RMOSTAT
Thethermostat housing contains the pressure valve and spring, and the thermostatThe circulation of water through the cooling system the water P1Jmp and the ratio of coolant discharge to intake is controlled the balanced action between the pressure control valve and the thermostatSee Figure 5-4 When the power head and cooling system temper atures reach 145 the thermostat opens, aHowing heated water to pass through the water disc hargeThe drop in cooling system pressure caused the opening of the thermostat causes the pressure valve to close, preventing the cooling system water from being recirculated through the water and causing fresh water to drawn through the water intakeThis action provides perfect water jacket temperatures in water and any weather