ENGI
W
E
Page
E50
EMISSION
CONTROL
Vehicles fitted with an
emission control system hove an evaporation control system, anti
-
&
run
-
on system, exhaust emission control system and a
crankcase
vopour control.
Evaporation Control System
The evaporation control prevents petrol vopaur escaping to atmosphere from
ttie fuel tank
and carburetters. Vapour
is
routed through pipes to a charcoal canister when the engine
is
not running arid when the engine
is
running air
is
drawn throu
g
h the canister, purging
the
petrol vapour from the charcoal. The air and petrol vapour mixture purged from the
charcoal
is
routed to the carburetters and burned during engine combustion.
Anti Run
-
on System
An Anti Run
-
On valve (ARO)
is
fitted, this
is
linked to the oil pressure switch, ensuring
.......
.
.
.
.
....
!
.-....--
..........
I:-:--!
-=I
.tr
;L.
.--..
i.
.
.
,$,G
,,.."..
..."
.5,....1..
..,
.."
..-..--
-...
..
..
...-
--
,
-
emission from the carburetter float chambers.
The carburetters fitted ore Zenith
175CD2SE, ttie front carburetter (C907E0791F) and the
rear carburetter
(C907E0792F).
Exhaust Emission Control
Exhaust emissions from the engine are controlled using an air pump and exhaust catalyst
converter. A vacuum pipe from the
corburetters sense the amount the throttle
is
opened
and this controls the amount of air injected into the exhaust ports.
The air pump
is
driven through a 'V' belt from a pulley attached to the exhoust cam Skoft.
Air
is
drawn through an oir filter by the pump and fed to a diverter valve, where air
is
diverted into the exhaust ports depending on the
c:;.,o~tni
rh~
thr-:ilr+
is
opened.
A non
-
return valve ensures the exhaust gases do
not
c
eote back ij,essure in the air line
to the pump.
When fitting air injectors into cylinder head
opply anti
-
seize paste (molybdenum disulphide
paste) to the threads of the air injectors. Apply 'Firegum' or similar to the air rail unions
when fitting to air injectors ond ti
g
hten to a torque loading of 15lb.ft. (2.07k.grn.).
ESPRIT
Issue
12/78
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