Husqvarna SM 610 2006 Workshop Manual Download

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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 c k in g th e c o o lin g flu id le ve l

N .2

C o o lin g s ys te m

N .4

E n g in e c o o lin g s y s te m o ve rh a u lin g

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.