Husqvarna SM 610 2006 Workshop Manual page 80

E N G IN E O V E R H A U L IN G
R e p la c in g o ve rsize valve s
R e m o ve th e se a ts b y m illin g th e ring s. T a ke gre at ca re n ot to da m a g e the
se a t lo ca tio n s in th e he ad . C h eck th e d ia m ete r o f th e sea t lo ca tion s in the
h e a d a n d ch o o se th e m ost su itab le ove rsize va lve sea t ta king in to a ccoun t
th a t cle a ra n ce s a t a sse m bly sh ou ld b e 0.0 04 7 ÷0 .0 0 63 in fo r th e inle t an d
0 .0 0 4 3 ÷0 .0 0 6 2 in for the e xha ust. S pa re valve se ats a re sup plie d w ith a n
o ve rsize o u te r d ia m eter o f 0 .00 11 in. (m a rked in W H IT E ) o r 0.0 02 3
in . (m a rke d in R E D ).
E ve n ly h e a t th e he a d a nd ke ep it for 1 h ou r at a te m pe ratu re of 20 0 °C (39 2 °
F ).
In sta ll th e va lve se ats a nd se t the va lve sea ts w ith sp ecia l too l.
A llo w to co o l th e n m ill th e se a ts an d g rin d th e valve s.
V a lve g u id e s
C a rry o u t a ca re ful visua l ch e ck of the va lve gu id es.
T h e va lve g u id e s sh ou ld be ch ecke d for w e ar b y m ea su ring the cle a ra n ce
b e tw e e n th e va lve ste m a nd va lve g uid e; use a d ial g au ge a nd m ea su re the
cle a ra n ce s o n th e "x" a nd "y" axe s.
In le t va lve n o m ina l cle ara nce : 0 .00 07 87 ÷0.0 0 1 81 in .
W e a r lim it: 0 .0 0 354 in .
E xh a u st va lve n om ina l clea ran ce : 0 .0 0 07 87 ÷0.0 01 81 in .
W e a r lim it: 0 .0 0 177 in .
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