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364
FIAT·85O PASSENGER CARS
- check for seized valve sealing surfaces and,
if necessary. renew valve plunger;
- operate starter motor several times to eliminate
any air locks from. the plunger valve: to avoid
starting the engine during this operation discon-
nect ignition coilj
- ensure that the return spring is correctly
positioned in the plunger valve unit and refit valve
plunger using service tool A. 70146/1;
- ensure that the solenoid sealing ring is in
good condition and refit solenoid;
- tighten two solenoid retaining nuts to 15.19
±
1.08 fLlbs (2.1 ±0.15 kgm);
- check oil level and top-up
if
necessary. as
described on page 354.
Oil Pump.
TO RENEW OIL PUMP SEAL
This operation may be carried out without remov-
ing
the
ptunp;
remove the
gearbox complete from
the vehicle, remove Idroconvert transmission from
the gearbox and proceed as follows:
- drain Idroconvort transmission oil;
- close oil inlet on cover by means of plug
(4, fig. 592) and clean transmission outer surfaces;
- remove guarantee seal plug and pin (I , fig. 592) ;
- place Idroconvert transmission on the bench
with output shaft turned upwards;
- lift casing upwards to separate it from the
torque converter;
Fig. 593 - Centralising Hte 011 pump.
,. Service tool A. 70145 for pump body centralisation. - 2. Pump
body. - 3. Driven gear. - 4. Drive gear.
- check conditions of torque converter hub at
the point of contact with pump seal - the hub should
be clean and free from wear, scoring and burrs;
should any of the above defects be found the con-
verter must be renewed;
- rotate outer casing to uncover the pump body
(torque converter end facing upwards);
remove dust cover (2, fig. 582);
- remove seal using service tool A. 45023;
- lubricate a replacement seal with GI/M oil
exercising the utmost care to avoid damaging the
sealing lips;
- offer the seal onto its seat in pump body and
centralise very carefully (making sure that it
is
fitted correctly);
- drive seal in position using
service tool
A. 70142 (I. fig. 580) - when fully home the seal
must be flush with the pump body;
- fit dust cover (2, fig. 582) using service tool
A. 70143.
Refit torque converter - see page 365.
TO CENTRALISE THE OIL PUMP
This servicing operation is necessary when noisy
pump operation is detected.
Repeat the same sequence as that described in
previous chapter up to removal of seal by means
of service tool A. 45023.
Then:
- slacken five pump retaining screws;
- insert pump centraliser tool A. 70145 very
gently (fig. 593);
- tighten five pump retaining screws to IO.85±
1.08 fUbs. (1.5±0.15 kgm), as indicated in tighten-
ing reference shown in fig. 581;
- withdraw service tool A. 70145;
- insert service tool A. 70144 (fig. 594) and
check for noisy gear operation and roughness dur-
ing running;
- fit a new seal and complete refitting procedure
as described above.
Should roughness be experienced during run-
ning, repeat centralising operation; if the defect
cannot be remedied, renew the pump following
the procedure described below.
TO RENEW OIL PUMP
Carry out the same procedure as described under
«To Renew Oil Pump Seal
fl
up to removal of dust
cover. Then:
- remove five pump retaining screws and with-
draw pump complete;
- obtain a new pump (pump body plus gears),
lubricate gears with
GI/M
oil and assemble the
pump;
- check gear rotation using service tool A. 70144
(fig. 594);
lubricate and fix sealing ring on pump body;
- place the casing horizontally (with cover facing
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