Lotus TURBO ESPRIT Service Manual page 370

Page 72
LC
. 5
-
CARBURETTOR BALANCING PROCEDURE
1
.
Ensure ignition timing i s correct and the air filter and a l l trunking etc, fitted.
2.
Remove anti-tamper caps from idle C O adjustment screws, air bleed balancing
screws, and throttle coupling screws.
VACUUM TAPPING SCREW
BALANCIN
SCREW
REAR
CARBURETTOR
ENGINE IDLE
SPEED SCREW
IDLE STOP BRACKET
THROTTLE COUPLING
SCREWS
I
FRONT
OF
VEHICLE
h
FRONT
-
CARBURETTOR
Replace vacuum tapping screws with manometer adaptors TOOOT0496 and connect
to manometer TOOOT0499. Fit exhaust probe to exhaust outlet pipe of
turbocharger and connect to
CO/HC
analyser (e .g. Sun
EPA
75
or equivalent).
Fully close a l l balancing screws (do not 'graunch').
Set idle
C - 0
adjustment screws
6
x
$
tur'ns open, and start engine.
With engine at normal running temperature with
ACU
off and cooling fans
+
a
on, ad just throttle stop screw to give specified idle speed.of
950
-
50
rpm
.
Adjust throttle coupling to balance lower of mercury columns
1
and
2
with
lower o f mercury columns
3
and
4
to within
3
mm, ensuri'ng that the
two
coupling screws securely clamplagainst the throttle lever.
Considering the front carburettor, .gradually unscrew the air bleed balancing
screw of
ONLY
the carburettor barrel with the highest mercury column,
u n t i l . i t is balanced with the- lower column to within
3
mm.
Carry out the same procedure for the rear carburettor,
and if
necessary
-re-adjust the t h r o ~ l e coupling to balance a l l columns
to
within
3
mm.
Ensure correct idle speed i s maintained.