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356
FIAT· 850 PASSENGER CARS
FAULT
-
FINDING
CHART
Poor pick-up
Assess engine conditions and carry out adjustments as required and tune-up_
Using a revolution counter, check engine stall speed.
If
below 1,400 l.p.m.
or above 2,000 I.p.m. replace the transmission (see page 366).
Transmission does not
Check selector lever contacts and cables.
engage
Ensure that neutral switch
is
not permanently connected to earth; to do this
remove switch from transmission and check on test bench.
Inspect solenoid operation.
Plunger valve stuck in • disengaged _ position.
Faulty solenoid relay.
Transmission
will
not
Check for faulty operation of selector lever contacts and leads.
disengage
-
Check solenoid operation.
Plunger valve stuck in
(l
engaged
0
position.
-
Faulty solenoid relay.
Starter motor will not
Faulty neutral switch (no connection to earth); in this case engine starting
operate
may be obtained by depressing selector lever knob.
Faulty starter inhibitor switch, current supply lead loose or broken; engine
starting by means of starter motor is impossible.
Abnormally low tTans-
Oil leakage through transmission cover revealed by the presence of oil on
mission oil level
cover periphery and on transmission case fins.
Oil leakage through gear pump seal revealed by the presence of oil on
flywheel cover.
I
Increase in gearbox oil level ; oil leakage through seal on torque converter
support.
Noisy operation
Rocker-like noise present at
all
times during operation.
Hissing noise audible at 2,500 to 3,000 r.p.m. reaching maximum intensity
at 4,500 to 5,000 r.p.m., less audible at lower speeds.
In both cases the noise is due faulty gear pump.
Rattling and considerable vibration is due to an internal fault of the torque
converter.
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