d)
Replacing of radial seal
This w ill be most ea sily done a t t he sa me time a s repla cing th e bea rings.
If, for some reason, the seal is lea ky a nd t here is no need to cha nge the
bear ing, proceed a s follow s:
1 Remove the volute casing
and mechanical seal according to
pos. a ) a nd b) a bove as w ell a s th e rear plat e (1).
2 Remove the slinger (11).
Ta ke ca re not t o deform th e ring.
3 Remove the seal (12)
by prying (damaging) without scratch-
ing the sha ft. In connection w ith bear ing cha nges the seal ca n easily
be driven out a xia lly.
4 Inspect the shaft.
I n c a s e t h e s ea l h a s w or n t h e s h a f t b y m o r e
th a n 0.5 mm ra dia lly, th e sha ft should be replaced a ccording to pos.
c) a bove.
5 Oil the new seal
a nd press it in until it levels w ith t he bea ring
housing.
6 Mount the slinger (11)
a nd t he rear pla te (1).
7 Install the mechanical seal,
impeller and the volute casing
a ccording to pos. a) a nd b) a bove.
19.4
Temperature control system
19.4.1 General description
The LT a nd H T circuits a re equipped w ith tempera tu re contr ol va lves.
Temperat ure r a nges a ccordin g t o cha pter 01., section 01.2. The va lves
a re norma lly m ounted outside of th e engine.
19.4.2 LT and HT thermostatic valve
The thermostatic valve is equipped with positive three-way valve
action in which the water is positively made to flow in the direction
required. When t he engine is sta rted up a nd is cold, the t hermostat ic
valve causes all of the water to be positively by-passed back into the
engine, thus providing the quickest warm-up period possible. After
w a rm up, the correct a mount of wa ter is by-passed a nd a utoma tically
mixed w ith t he cold wa ter return ing from t he heat excha nger or other
cooling device to produce th e desired w a ter out let tempera tu re. If ever
requir ed, the th ermosta tic valve w ill shut off positively on th e by-pa ss
line for ma ximum cooling. The t hr ee-w a y a ction of the va lve allows a
consta nt wa ter flow through the pump a nd engine at a ll times with no
pump restr iction w hen t he engine is cold.
No a djustments a re ever required on th e thermosta tic va lve. The
34SG-9501
Cooling Water System, V-engines
