100
SECTION 10 − ENGINE − CHAPTER 1
603.54.471.00 − 11 − 2004
OIL FILTER − Replacement
The oil filter (3) figs. 7 and 8 is of the full−flow, integral
paper cartridge type, and is installed in the pump
delivery line.
Should the filter become clogged, the safety valve (2)
will open to allow the oil to by−pass the filter, thus
ensuring that the engine continues to be lubricated,
although with unfiltered oil.
Replace the cartridge periodically (every 400
operating hours), remembering to:
— oil the outer part of the seal in contact with the
mounting on the crankcase;
— screw on the new cartridge until the seal is up
against the mounting;
— tighten the cartridge, by hand only, through a
further 3/4 turn.
LOW OIL PRESSURE INDICATOR − Functional
checks
The indicator consists of a control switch (4) figs. 7
and 8 and a red warning lamp in the instrument panel,
which illuminates in the following conditions:
— low oil pressure (the warning lamp also
illuminates in normal conditions, with no faults
present, when the engine is hot and idling at low
speed);
— control switch malfunction.
If the red lamp fails to illuminate when the engine is
stopped and the ignition switch is turned to the power
on position, the possible causes are:
— blown fuse;
— blown lamp;
— interruption in wire to the control switch.
CHECKS, MEASUREMENTS AND REPAIRS −
COOLING SYSTEM
Clean all parts carefully before proceeding with the
operations described below.
The cooling system is filled with a permanent coolant
mixture consisting of water and “AMBRA
AGRIFLU” antifreeze (up to 50% in volume). This
mixture prevents freezing down to the following
temperatures:
Degrees °C (°F)
−8
(17.6)
−15
(5)
−25
(−13)
−35
(−31)
% in volume of
“AMBRA
AGRIFLU”
20 30 40 50
This mixture also has anti−oxidant, anti−corrosion,
anti−foaming and anti−scaling properties to ensure
long−term protection of the cooling system.
The same mixture can be kept in the cooling system
for a maximum of 2 years or 1600 operating hours,
whichever comes sooner; after which it must be
changed.
RADIATORS − Flushing and checks
Two valves are built into the radiator cap, one
compression valve and one depression valve. Check
periodically that they are working correctly.
When overhauling, remove deposits of lime scale in
the radiator by means of a solution of water and
de−scaling agent in the proportions shown on the
container.
It is never advisable to limit flushing to the radiator
only − always extend it to the entire cooling circuit
and top up the engine with the solution referred to
above.
Run the engine for about an hour. With the engine off,
drain the solution through the drain plug aperture.
In the event of leakage, the radiator is checked by
immersing it in a tank of water at a temperature of
20°−40° C (68°−104° F), introducing air into the
radiator at a pressure of 0.98 bar (14.1 psi) for
approximately two minutes (repeat the test at least
three times).
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