Farmall 90, Руководство пользователя

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SECTION 10 -- ENGINE -- CHAPTER 1 131
COOLING SYSTEM
Clean all parts carefully before proceeding with the
operations described below.
The cooling system is supplied with a permanent
coolant mixture consisting of water and “ Fleetguard
Compleat ” antifreeze (up to 50% in volume). This
mixture prevents freezing down to the following tem-
peratures:
Degrees
°
C (
°
F) --8
(17.6)
--15
(5)
--25
(--13)
--35
(--31)
% in volume of
“ Fleetguard Com-
pleat“
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 1200 operating hours,
whichever comes sooner; after which it must be
changed.
Radiator -- Flushing and Checks
Two valves are built into the radiator cap, one com-
pression valve and one depression valve. Check the
correct operation of the valves periodically.
When overhauling, remove deposits of lime scale in
the radiator by means of a solution of water and
descaling 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)
in order to drain the solution through the drain plug.
In the event of leakage, the radiator is checked by im-
mersing it in a tank of water at a temperature of 20 to
40
°
C (68 to 104
°
F), introducing air into the radiator
at a pressure of 0.98 bar (14.21 psi) for approximate-
ly two minutes (repeat the test at least three times).
Coolant Thermometer -- Testing
If malfunction is suspected, immerse the bulb of the
thermometer in water and check the readings
against a test thermometer (repeat the test a number
of times with different water temperature to be sure).
Thermostat Valve -- Replacement
The thermostat valve (5, Fig. 4) is fitted in the cylin-
der head coolant outlet union.
The thermostat valve cannot be adjusted and there-
fore must be replaced if it does not meet the tempera-
ture specifications.