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GROUP 26
COOLING SYSTEM
4
5
6
7
------.;=~
8----r--i--t
9
-----,/---+f1.if+r:r+:-n~~
10
11
12
1. Washers
2. Boll
3.0il
4. Seals
2:
40
Fig. 2-90.
Fan coupling
5. Washer
6. Flange, water pump
7. Cenler boll
8. Hub
DESCRI PTION
Fig. 2-89.
Sealed
cooling
system
9. Friction material
10.
Rubber ring
11. Casi ng
12. Fan blade
GENERAL
The engine is water-icooled and the
cooling
system is
of the sealed type, see Fig. 2-82. A fan cover mounted
on
I
t he
radia,
t '0r
improves the Gooling function
of
the
fan. The fan is
speed ~regulated,
a so-called slip-
coupl·ing type (see Fig. 2-76). The funofJion of which
is to ensure
tha,
t the fan hlades do not
exceed
a
certain speed even if the engine speed is
exceeded.
See Fig. 2-96. The five fan blades are mounted asym-
mertricalrly to keeip down the noise level. The fan
coupl1
ing cons·ists of the cO'sing (11, Fig. 2-90) in which
the plastic fan hlades (12) are secure:d with the bolt
(2). The
cal
s ing (11) has
two
halves whkh, however,
cannort be
,
s eparated for repairs, the fan coupling then
being replaced complete. The hub (8) has a light fit on
the
wal
t er pump flan9'e (6) and is locked by means
of the center bolt (7). The hub is provided with a slip
dis'
c of friction
materiar
l (9)
surrounr
d ed by oil. During
idling
and atlow speleds, the slipping is insignificant,
so that the fan provides an air current for satis-
fadory cooling. When the in going speed (that of
the
water pump) exceeds
abou·
t
2600 r.p.m., the slipping
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