Fiat 1996 Brava Service Manual page 44

Introduction
Planned maintenance
Bravo-Brava
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If the tappet clearance does not correspond
to the recommended figures, proceed as fol­
lows:
1. Using pressure lever 1860443000, lower
the cup for the tappet concerned and in­
sert tool 1860724000 for retaining tap­
pets positioning the notches in the edge
of the tappet in such a way as to facilitate
the subsequent extraction of the shim to
be replaced.
2. Lift up the shim to be replaced, working as
appropriate, then remove Jt using pliers
1887001000.
NOTE Rep/ace the shim removed with an­
other one of the appropriate size to
restore the correct valve clearance.
Carry out the same operation for the
other shim for the pair of valves be­
ing adjusted.
E CHECK EXHAUST GAS EMISSIOSN (petrol engines)
The electronic injection/ignition systems used are capableof automatically controlling the advance, the
carbon monoxide (CO) content and the idle air flow rate, therefore no manual adjustment operations are
required. However, a check on the content of the exhaust gases downstream of the catalyzer can pro­
vide useful indications on the injection/ignition system operating conditions and the engine and cat­
alyzer parameters.
The concentration of carbon monoxide (CO), unburnt hydrocarbons (HC) and the value X, is measured
with the catalyzer at operating temperature (300 - 350 °C) (we recommend driving hard along a section of
road for around 5 to 10 minutes to ensure that the catalyzer reaches operating temperature), the insert a
suitably calibrated tester sensor at least 30 cm into the end of the exhaust pipe as shown in the diagram
overleaf.
If the shape of the end section of the exhaust pipe is such that the sensor cannot be fully introduced, add a
special extension pipe ensuring the seal in the join area.
1. Check that the concentration of CO and the value X during idling and accelerated idle, correspond
to the values recommended in the government circular:
Engine measurement during idling: CO limit <0.5% vol.
Measurement for accelerated idle (2000 - 2500 rpm): CO limit scO.3% vol.
Lambda = 1 ± 0.03
10 Print no. 506.670/09