FIAT 127 1974 1.G Owner's Guide

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Fig. 13.4 Engine mounting (right-hand side) (Sec.3) Fig. 13.5. Engine mounting (left-hand side) (Sec.3)

1 – Mounting
2 – Crankcase
1 – Mounting to chassis bolts
2 – Mounting
3 – Mounting to transmission bracket

both the inlet and exhaust manifolds which are
on the same side of the engine.
Engine removal - 127 Special and 127
from chassis number 1104290 onwards
94 The removal of the engine assembly from
these models is slightly different from that
described in Chapter 1, owing to redesigned
engine mountings.
95 For the later type of mountings,
disconnection of the engine is achieved by
removal of the engine suspension mounting
securing bolts after taking the weight of the
assembly on a hoist.
96 On refitting the assembly tighten the securing
bolts to the specified torque load.
4. Fuel system

Carburettors - general
1 On L, C and CL models the 1049 cc engine is
fitted with either a Weber 32 ICEV 161150 or a
Solex C32 TDI/4 carburettor with a downdraught
single venturi and automatic coolant heated
choke (photos).
2 On Sport versions, a dual venturi Weber
carburettor is fitted with manual choke.

Weber or Solex single venturi
carburettors


Removal and refitting
3 Remove the air cleaner
4 Disconnect the throttle cable (photo).
5 Disconnect the distributor vacuum pipe
(photo). 6 Disconnect the fuel flow and return
hoses 7 Disconnect the coolant hoses from the
automatic choke housing and tie the pipes as
high as possible to prevent coolant loss (photo).
8 Unbolt the carburettor flange mounting bolts
and lift the carburettor from the manifold.
9 Refitting is a reversal of removal, but use a
new flange mounting gasket
Dismantling and adjustment
10 Clean the outside of the carburettor, remove
the top cover screws and lift off the cover.
11 Clean out the float bowl.
12 Any jets or bleed screws if removed, should
only be cleaned by blowing air through them.
Never probe with wire or their calibration will be
ruined.
13 Check the float level by holding the
carburettor cover vertically so that the float
hangs down, and then measure between the
casting flange and the nearest point of the float.
Adjust if necessary by bending the float arm tab
until the clearance conforms with the
Specifications according to carburettor.
14 The automatic choke will not normally require
dismantling, but if the cover is removed, make
sure that the centre index marks on the cover
and housing are in alignment before tightening
the choke cover screws.
15 On later carburettors, the mixture screw is
fitted with a tamperproof cap and adjustment to
the slow-running should therefore be limited to

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altering the throttle speed screw.
16 On earlier carburettors, or if new components
have been fitted to carburettors having a
tamperproof screw, then the slow-running and
mixture can be altered, but only if an exhaust
gas analyser is available in the case of later
carburettors, after the tamperproof cap has been
broken off.
17 On earlier units, use a device such as a
mixture adjustment aid or a vacuum gauge fitted
in accordance with the manufacturers'
instructions to obtain the correct slow-running
adjustment.
18 On later units, an exhaust gas analyser,
again used in accordance with the maker's
instructions, will ensure that the CO level is
within the limits specified. Fit a new tamperproof
cap on completion.
Weber dual venturi carburettor

Removal and refitting
19 These operations are similar to the
operations described in paragraphs 3 to 9 of this
Section, but the unit is of manually operated
choke design and will therefore not have coolant
hose attachments. A choke cable is fitted
instead.
Dismantling and adjustment
20 The operations are similar to those described
for the single venturi type carburettor, once the
upper body has been removed (six screws).
21 If jets are extracted, identify them as to which
side of the carburettor (primary or secondary)
they came from.


4.4 Throttle cable connection to Weber single ventu ri
carburettor 4.5 Weber single venturi carburettor installed (va
cuum pipe
arrowed


4.7 Weber single venturi carburettor showing coolan t hoses
(arrowed) to automatic choke housing. Note fuel hos es
connected to top right of carburettor 7.6 Location of fuse block - 1049 cc engine models

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is an economical proposition if the original one
has seen service to a high mileage. Very often a
generous allowance is made for the old unit.
22 To check the float setting, hold the
carburettor cover vertically with the float hanging

down. The distance 'a' (see Fig. 13.8) measured
between the float and the cover (with gasket
fitted) should be 7 mm ± 0.25 mm. Where
necessary, bend the float tongue.
23 This type of carburettor is fitted with a
tamperproof cap on the mixture screw, and
unless an exhaust gas analyser is available,
restrict any adjustment to the slow-running to
turning the throttle speed screw.

Carburettor overhaul – general
24 Whenever it is decided to overhaul a
carburettor, always obtain the appropriate repair
kit in advance. If throttle or choke valve plates o r

their spindles are worn, do not dismantle them
but obtain a new carburettor. A new carburettor


Fig. 13.6. Solex carburetor adjustment screw (Sec.4)

Fig. 13.7. Weber dual venturi carburettor flost setting
diagram (Sec.4)
1 – Carburettor top cover 7 – Float arm tab
2 – Fuel inlet needle valve 8 – Float arm
3 – Float stop 9 – Float
4 – Needle 10 – Gasket
5 – Return hook a = 7
± 0,25 mm
6 – Ball

A – Throttle speed screw B – Sealed mixture scre w

Fig. 13.8. Weber dual venturi carburettor (Sec.4)
1 – Throttle cable 4 – Throttle speed scre w
2 – Cable conduit 5 – Throttle control diap hragm
3 – Choke cable

Fig. 13.9. Location of mixture control screw (1) (W eber dual
venturi carburettor) (Sec.4)

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