mission
Control
Systems-except
California
Crankcase
The engin.e crankcase breather outlet incorporates an oil sepa
rator
flame-trap
emission
(arrester) In the top
o~
the valve rocker cover which is connected by hoses to
control
the controlled depression
chamber
between the
piston
and the throttle disc of
the
carburette
r. Piston blowby fumes are drawn into the depression chamber
of.the
carburetter
from the rocker cover, and are joined by purged air from the
pnm~ry
c~arcoal
.
canister
of
the fuel evaporate loss system. These fumes
combine with the Inlet charge for combustion
in the normal way.
Exhaust
The exhaust emission control system is designed to give the required degree of
emission
control of the ca
rbon
monoxide,
unburnt
hydrocarbons and oxides of nitrogen
control
content of exhaust gases.
The emission control system is a combination of engine components
and
air
injection techniques
and
consists
of
a special carburetter, air injection into the
exhaust manifold
and
exhaust gas recirculation.
THE
EMISSION
CONTROL
COMPONENTS
23
15
16
17 8
-:
i'
2
~
2
7
ND141C
The quantity of air-polluting elements in the gases leaving the exhaust pipe is
reduced by adding air to the hot gases immediately they leave the combu tion
chambers of the engine. The injection of air into the exhaust gases promote
continued conversion of the undesirable hydrocarbon
and
carbon monoxid
components of the exhaust gases to relatively harmless
carbon
dioxide and wat r.
The exhaust gas recirculation valve mounted on the exhaust
man
ifold will
re-circulate a controlled quantity of the exhaust gases to reduce combu tion
chamber temperature.
The catalytic converter is fitted into the exhaust system in order to reduce c
arbon
monoxide
and
hydrocarbon emissions. .
An air
pump
mounted on the front of the engine,
and
belt driven from the
crankshaft pulley, supplies air unde r pressure through a hose, a check valve,
and
distribution pipe to the exhaust manifold. The check valve prevents high
pressure exhaust gases from blowing back into the
pump
due to, for example,
pump
drive failure.
The carburetter is
manuf
actur d to xhau t emission specification and
is tuned to give the maximum mi
i n I n i tent with retaining vehicle
performance and drivabili y. Th m t rin n
J i arranged in such a manner
that
it is always lightly prin I d d in t th ide of the jet to ensure con-
sistency of fuel metering. A
thr
t 1 y..p valve limits the inlet manifold
depression
and
ensures that durin c nditions of engine overrun the air/fuel
mixture enters the engine cylind r in
burna
ble condition consistent with low
emission levels.
1. Secondary charcoal adsorption canister
2. Canister inter-connecting pipe
3. Primary charcoal adsorption canister
4.
Vapour
lines
5. Purge line
6. Restricted connection
7. Restrictor
8. Sealed oil filler
cap
· Oil separator/flame
trap
(arrester)
O. Fuel pipe
11
l:'
n.al
........
~
.....
13. Air
pump
14. Check valve
15. Air temperature control valve
16.
Hot
air hose
17. Exhaust gas recirculation valve
18.
E.G.R.
valve pipe
19. Flame
trap
20. Flame
trap
line to carburetter
21. Flame
trap
line to
E.G.R.
valve
22. Flame trap line to distributor vacuum unit
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