Husqvarna SM 610 2006 Workshop Manual page 206

E N G IN E C O O L IN G S Y S T E M
T a b le o f C o n te n ts
C h e ck in g th e c o o lin g flu id le ve l
C o o lin g syste m
E n g in e co o lin g system o ve rh au lin g
2
N .2
N .4
N .6
C h e c k in g th e c o o lin g flu id le ve l
C o o lin g flu id a b so rb s th e h e a t fro m th e th e rm ic g ro u p (p isto n ,
cylin d e r, h e a d ) a n d co n ve ys it to th e e xte rio r a tm o sp h e re th ro u g h
ra d ia to r.
F o r a co rre ct o p e ra tio n o f th e co o lin g s yste m it is o f u tm o st
im p o rta n ce th e p e rio d ica l ch e ck of flu id le ve l.
T h e la c k o f th e h e a t e x c h a n g e m e a n s (w a te r) b e tw e e n
th e rm ic m a s s a n d ra d ia n t m a s s c o u ld c a u s e
o ve rh e a tin g o f th e c ylin d e r-p is to n a s s e m b ly w ith
c o n s e q u e n t s e izu re a n d , th e w o rs t, d a m a g e s to th e
c ra n k s h a ft a s s e m b ly.
T h e co o la n t (2 ) m u st b e flu sh w ith th e lo w e r sid e o f th e fillin g
p ip e u n io n . T h e le ve l in sid e th e e xp a n sio n ta n k m u st n e ve r
b e u n d e r th e M IN (1 ) (p a g e N .3 ).
H o w e ve r if e n g in e o ve rh e a tin g is n o tice d , ch e ck th a t ra d ia to r
is co m p le te ly fille d u p . C h e ck th e e le ctric fa n (3 ) o p e ra te s
p ro p e rly (th a t is th a t th e e le ctric fa n re m o ve s th e w a rm a ir fro m
th e ra d ia to r). C h e ck o f ra d ia to r le ve l m u st b e p e rfo rm e d w ith
co ld e n g in e (se e p a g e D .1 5 ). If fo r a n y re a so n yo u h a ve to
o p e ra te o n a h o t e n g in e , ta ke ca re to slo w ly d isch a rg e p re ssu re .
T h e ra d ia to r ca p is p ro vid e d o f tw o u n lo ckin g p o sitio n s, th e first
b e in g fo r th e p re vio u s p re ssu re d isch a rg e .
O p e n in g th e c irc u it w ith o u t ta k in g c a re o f a b o ve
d ire c tio n s c o u ld c a u s e s c a ld s to th e o p e ra to r
a n d o th e r p e o p le a ro u n d .
C o o lin g s ys te m
T h e co o lin g s yste m is o f th e fo rce d circu la tio n typ e , w ith ce n trifu -
g a l
p u m p lo ca te d o n th e L .H . sid e , a t th e c ylin d e r h e a d , d o u b le h e a t
e xch a n g e r w ith ve rtica l flo w , th e rm o sta t a n d e le ctric b lo w e r.
T h e o p e n in g o f th e th e rm o sta t h a p p e n s w h e n th e te m p e ra tu re o f
th e co o lin g liq u id re a ch e s a b o u t 7 5 °C (1 6 7 °F ); a t th is p o in t th e
liq u id p a sse s in th e h e a t e xch a n g e rs a n d , if th e te m p e ra tu re o f
9 0 °C (1 9 4 °F ) is re a ch e d , th e e le ctric b lo w e r is a lso a ctu a te d . a n
e xp a n sio n ta n k c o n n e cte d to th e h e a t e xch a n g e r th e re co ve ry o f
th e e xce ss co o lin g liq u id . F u rth e r, a ve n t p ip e o n th e co o lin g
liq u id
p u m p co ve r, is co n n e cte d to th e tw o h e a t e xch a n g e rs.