Lada Niva Manual - Maintenance Page 7
Carburettor
Every 10.000 Km (and also after the first 2,000-
3,000 Km if the car is new), wash the carburettor
fuel filter and the fuel pump filter with gasoline and
blow them out with compressed air.
Every 20,000 Km clean the carburettor from the
inside, wash it with gasoline or benzene and blow
out with compressed air. When cleaning the
calibrated orifices of the jets, use a wooden stick or
match with a pointed end wetted with acetone. Do
not use wire, even soft, not to disturb the
dimensions and finish of the orifices. When screwing the jets in or out, avoid damaging the
thread in the holes.
Check and, if necessary, adjust the fuel level in the float chamber and the float travel, for
which purpose.
• Make sure that the mass of float 9 (Fig. 36) complete with arm 7 is 12+1 g, the float has no
holes or dents, and can freely rotate on its pin.
• Make sure that seat 2 of needle valve 4 is tightened reliably and that damper ball 5 built
into needle valve 4 does not stick
• Set upper body 1 vertically so that the fuel inlet union is directed upwards, the needle
valve is closed, and float tongue 8 lightly contacts the needle valve ball.
• With the parts in this position, measure the distance between the float and the surface of
gasket 10 which fits the upper body; the distance should be 6.5 mm
• Change the position of the tongue, if necessary, to obtain the required distance; the tongue
must be perpendicular to the valve axis, and the contacting surface of the tongue should
have no defects that may cause sticking of the valve.
• Check the float travel which should be 8 mm, changing the position of stop 3, if necessary.
• Check that pull-back yoke 6 of the needle valve does not interfere with free travel of the
valve.
• Reinstall the carburettor upper body after making sure that the float is free to move
without brushing against the chamber walls.
Note. When replacing the needle valve, also replace the gasket between the seat and the upper
body.
Idling speed adjustment
Every 10.000 Km (and also after the first 2,000-
3,000 Km if the car is new), adjust the minimum
idling speed of the engine. Have this adjustment
done at a service station. The Owner is allowed
only to carry out fine adjustment of the engine
idling speed within the range permitted by idle
speed screw limiting bushing 1 (Fig. 37) and by
idle mixture screw limiting bushing 2. Attempts to
turn the bushings through a larger angle will
destroy them. In this case the Manufacturer bears
no responsibility for excessive content of carbon monoxide (CO) in the exhaust gases and for
excessive fuel consumption.
Fig. 36.Adjusting Fuel Level In Carburettor
Float Chamber: 1- carburettor upper body, 2 -
needle valve rest, 3 - stop, 4 - needle valve, 5-
ball, 6- pull-back yoke, 7 arm, 8 lounge, 9-
float, l0- gasket.
Fig 37. Idling system adjustment screws: 1- Idle
speed screw limiting bushing, 2- idle mixture screw
limiting bushing.
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