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 ab le o f C o nten 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 ckin g th e c o o lin g flu id le ve l
C o o ling fluid a bso rbs th e h e at fro m the the rm ic g ro up (p iston ,
cylin der, h ea d ) a nd co nve ys it to th e e xte rio r atm o sph ere thro u gh
ra d ia tor.
F o r a co rre ct op e ra tion o f the co o ling s ystem it is of u tm o st
im p o rta nce th e p e riod ica l che ck of flu id leve l.
T h e la c k o f th e h e at e x c h a n g e m ea n s (w ate r) b e tw e en
th e rm ic m a s s a n d ra d ian t m as s c o u ld c a u s e
o ve rh ea tin g o f th e c ylin d er-p is to n as s em b ly w ith
c o n s e q u e n t s eizu re an d , th e w o rs t, d a m a g es to th e
c ra n k sh a ft as se m b ly.
T h e co o lan t (2 ) m u st b e flush w ith th e lo w e r side of the filling
p ip e union . T he le vel in sid e th e expa nsion tan k m u st ne ver
b e u n de r th e M IN (1 ) (pa g e N .3).
H o w eve r if e ng in e o ve rhe atin g is n o ticed , ch eck th at rad iator
is co m p lete ly filled u p. C he ck th e e le ctric fa n (3 ) o p e ra tes
p ro p erly (th a t is th at th e ele ctric fan rem o ve s th e w a rm a ir fro m
th e radiator). C h e ck of rad ia to r le ve l m u st b e pe rfo rm e d w ith
co ld en g ine (se e p ag e D .1 5 ). If fo r an y rea so n you ha ve to
o p e rate o n a h ot e ng ine , ta ke care to slow ly disch a rg e pre ssu re .
T h e ra dia to r ca p is p rovide d of tw o u nlo ckin g po sitio ns, the first
b e in g for the p re viou s pre ssure d isch arg e.
O p e n in g th e circ u it w ith o u t ta k in g ca re o f a b o ve
d ire c tio n s c o u ld c au s e sc ald s to th e o p era 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 ling s ystem is o f th e fo rce d circula tion typ e , w ith ce ntrifu -
g a l
p u m p lo ca te d on th e L.H . side , a t th e c ylind e r h ea d, d ou ble h e at
e xch a ng e r w ith ve rtical flo w , the rm osta t a nd e lectric blow er.
T h e ope ning of the the rm osta t h a pp en s w h en the tem p era tu re of
th e coo ling liqu id re ache s a b ou t 7 5°C (1 6 7 °F ); at this p oin t th e
liq u id pa sses in the h ea t e xch an g e rs an d, if th e te m p era tu re o f
9 0 °C (1 94 °F ) is rea ch ed , the e le ctric blo w e r is a lso actua ted . an
e xp a nsio n tan k c o nn ecte d to th e h ea t e xcha n g er th e re co very of
th e e xcess co o ling liq u id. F u rthe r, a ve nt pipe o n th e coo lin g
liq u id
p u m p co ve r, is co nn ecte d to the tw o h ea t e xch an g e rs.