1971 Evinrude Fisherman 6HP outboards Service Manual, Page 48Get this manual
DESCRIPTION RUBBER MOUNTS The exhaust housing assembly, which carries the power head, "floats" on the steering bracket and pilot shaft assemblies on five rubber mountsIn this way all power head and driveshaft vibrations are isolated and prevented from being transmitted to the stern bracket and boat transomSee Figure 6-1EXHAUST RELIEF Normally, exhaust gases are conducted down through the exhaust housing and out the underwater outlet in the gearcaseThe Siphoning action of the propeller and water provides an unrestricted escape for exhaustHowever, in starting, water in the outlet creates back pressureExhaust relief is provided by another outlet located in the water discharge passage above the water lineSince no water is discharged until after the motor is started, the exhaust gases will initially be discharged through the water outletSee Figure 6-2WATER PUMP Water for cooling the power head is circulated by the water pump, located at the top of the gearcase