Triumph TR6 PI Operation Manual page 128

EMISSION CONTROL
E.G.R. SYSTEM VACUUM CONTROL TUBING
(Not fitted to pre 1974 cars)
Remove and refit
17.45.15
All tubing in the system is push fit. Check the condition of
tubing and connectorS before refitting and test the
operation of the valve to ensure leak free fitting.
E.G.R. SYSTEM
(Not fitted to pre 1974 cars)
Check
17.45.20
A system check of the valve carried out with the unit in situ
is by "blipping" the throttle and observing the valve unit,
which must be actuated by the sudden shift of engine
speed. The valve will settle back and it is not possible to
perform a total check to find small leaks by this method.
For a complete check on the operation of the valve connect
the vacuum pipe of a distributor vacuum test unit to the
valve and ensure that the valve is actuated, held, and that
there is no leak in vacuum.
To check the sealing of the control valve, apply vacuum to
the tubing from the three way connector to the valve, it
will be readily apparent if the valve is not sealing.
17.45.15
17.45.20
Triumph TR6 Manual. Part No. 545277 Issue I