15 - Engine
27 - Crankcase Ventilation Filter
00 - General
15 - 113 9813/5050-2 15 - 113
00 - General
Introduction .................................................. 15-113
Component Identification ............................. 15-114
Remove and Install ..................................... 15-115
Introduction
The engine is installed with a filtered open loop
crankcase ventilation (CCV) system.
Crankcase emissions are created during the
combustion process. These emissions include
unburned fuel and 'blow by gases' which contain
hydrocarbon and engine oil contaminates. A large
proportion of these emissions are prevented from
entering the atmosphere by the crankcase ventilation
filter assembly.
A series of ports in the crankcase, cylinder head
and rocker cover allow pressure to vent from
the crankcase. The vapour from the crankcase
flows from the rocker cover to the filter assembly.
Combined two stage filter elements remove around
90% of contaminates as the vapour passes from the
inside to the outside of the filter elements. Trapped oil
is allowed to drain back to the sump via a non return
valve. The filtered vapour vents to the atmosphere.
If the pressure inside the filter assembly rises due
to a blocked filter non return valve in the oil drain
line prevents vapour being forced back into the
crankcase.
The ventilation circuit incorporates a pressure relief
valve. If the filter element becomes blocked the valve
opens bypassing the filter and preventing a build up
of pressure in the crankcase. Although this prevents
serious engine damage it must be remembered
that the filtration system does not function when
bypassed. The filter element must be renewed at the
intervals specified to ensure a bypass condition is
avoided.
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