British Leyland Triumph Toledo, Repair Manual

Page: 89 / 339

FUEL SYSTEM
CARBURETTERS—Twin
—Tune and adjust
Idling—check and adjust 1 to 11 and 16
Mixture—check and adjust 1 to 20.
19.15.02
1. Check each piston damper, and top-up if necessary
with a recommended engine oil until the level is
\ in (13 mm) above the top of the hollow piston rod.
See 19.15.01.
2. Check the throttle action for signs of sticking, and
that the mixture control cable has in (1*6 mm)
free movement.
3. Remove the air cleaner. 19.10.01.
4. Connect up a suitable tachometer.
5. Start and- run the engine until it reaches normal
running temperature, as indicated by the tempera­
ture gauge. Continue running the engine at 2,500
rev/min for approximately one minute before
commencing tuning. Repeat this operation as often
as necessary.
6. Stop the engine and raise each carburetter piston
with the respective lifting pins. Release the pin and
check that each piston falls freely on to the car­
buretter bridge with a soft metallic click. Should
either piston fail to fall freely, refer to 19.15.18.
7. Start the engine and check the idling speed with the
tachometer, which should be 750-800 rev/min.
a . If the reading is not correct, continue with
instructions 8 to 11 and 15 and 16.
b . If the idle speed is correct but is not consistent
with smooth running, continue with instructions
8 to 21.
8. Slacken both throttle interconnection clamp nuts.
9. Slacken both jet control interconnection clamp nuts.
10. Slacken the trunnion bolts securing the mixture
control inner cable.
11. With the engine running, check the carburetter
balance with a meter or by comparing the intake
hiss in each carburetter by holding one end of a
length of small bore rubber tubing to each car­
buretter intake in turn and the other end to thtfear.
Turn the throttle adjusting screw on each carburetter
until the intensity of the hiss is equal in both intakes
with the correct idling speed of 750-800 rev/min
as indicated by the tachometer.
a. If with the carburetters correctly balanced the
idling is still erratic, continue with instructions
12 to 21.
b. If the idle speed is correct and consistent with
smooth running, follow instructions 15 to 21.
continued