Engine Systems
AIR SILENCER
The air silencer (Fig. 11). used on some marine
models, is bolted to the air intake side of the blower
housing. The silencer has a perforated steel partition
welded in place parallel with the outside faces,
enclosing flame proof, felted cotton waste which serves
as a silencer for air entering the blower.
While no servicing is required on the air silencer
proper, it may be removed when necessary to replace
the air intake screen. This screen is used to filter out
any large foreign particles which might seriously
damage the blower assembly.
Fig. 11 - Silencer Assembly
AIR BOX DRAINS
In normal operation, a slight amount of vapor from
the air condenses and settles at the bottom of the air
box. This condensation is drained through air box
drain tubes (Fig. 12) which direct the expelled air and
vapor down and away from the engine.
Air box drains must he open at all times, otherwise
water and oil may accumulate in the air box and be
drawn into the cylinders with the incoming fresh air.
Therefore, periodic checks should he made to ensure
they are open. Remove the air box covers and examine
the air box floor for oil or an accumulation of water. If
oil or water is found, wipe the air box dry with clean
rags and remove and clean the air box drain tubes.
Fig. 12 - Air Box Drains
Page 20
