EMISSION AND EVAPORATIVE CONTROL SYSTEM
All Triumph models entering the North American markets
incorporate efficient emission control systems.
These systems
enable the vehicles to conform with all current Federal Regula-
tions governing the emission of hydrocarbons, carbon monoxide,
nitric oxide and the emission of fuel, by evaporation, from the
fuel delivery system.
Fuel
The TR.6 (U.S.A.) performs efficiently on fuels of
91
octane (Regular Fuel). Note: The engine is not designed to use
unleaded fuel, and whilst the occasional tankful will not cause
damage, constant use of unleaded fuels will result in excessive
wear which will affect the emission control system.
Emission Control Systems-Servicing
The importance of servicing at the correct intervals cannot be
overstressed, improvements in design and manufacturing
techniques count for nothing if the servicing standards are not
upheld.
Routine servicing, carried out at the
mileage intervals quoted
in the Maintenance Summary helps to prevent deterioration of
the systems.
Carburetters
The engine is fitted with two STROMBERG
CDSE(V)
175
carburetters which are prime components of the emission system
and great care is exercised during the manufacture and initial
adjustment of these instruments. Adjustment of the carburetters
necessitates the use of specialised equipment and should be carried
out by British Leyland Dealers.
Carburetter Controls
The throttle rod linkage will not require adjustments during
normal operation. To ensure complete throttle closure a degree
of 'lost motion' or slackness is incorporated into the linkage;
no attempt must be made to adjust this out.
Carburetter Servicing Schedules
To maintain the carburetters
atpeak efficiency, regular servic-
ing as detailed in the 'Maintenance Summary' is essential. The
appropriate servicing operations should be performed by
authorized dealers, who are trained in the use of the special
equipment needed.
Crankcase Breathing (Fig. 1)
Crankcase breathing and evacuation of 'blow by' gases is
achieved by utilizing the characteristic partial vacuum in the
constant depression carburetters. By this method crankcase
emissions are burned in the engine combustion process (Fig.
1).
A wire gauze strainer in the engine top cover acts as an oil
separator/flame trap.
Anti Run-on Valve (Fig. 1)
This valve prevents the 'running-on' of the engine after the
ignition is switched off when, due to the heat of the engine,
a
condition of compression ignition is set up.
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