Husqvarna SM 610 2006 Workshop Manual page 84

E N G IN E O V E R H A U L IN G
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C am ro ller rep la cem en t
R ep lace th e ca m ro ller if, in c o n seq u en c e o f th e rad ial p la y im -
p ro ve m en t (th e n eed le b earin g p in is w o rn ), th e valve p la y exce ed
0.006-0.0 08 in ., b o th fo r th e in ta ke an d exh a u st sid es.
T he pin on the n ew roll bearing a ssures the roll contact w ith th e rin g and
m akes easier the pin insertion during assem bly. H old the roller w ith n eedles
in place in the rocker arm and m o unt the roller sha ft. U se a vise. B e careful
so that the rocke r arm isn t dam a ged. Lock the cam roller shaft w ith a center
punch from each side.
C am s h aft
C heck that cam surfaces are scored, stepped, gro oved etc. E xcessively w o rn
cam s are often the cause of bad engine tim ing thus reducing engine po w er.
Insert the cam sh aft betw een tw o references and th en check deviation using
tw o com parato rs. W ear lim it: 0.0039 in.
- M easure th e cam height H w ith a m icrom eter.
- H (ne w )= 1.3 15 in. for the intake; 1.307 in. for th e exhaust.
- W ear lim it: 1.30 3 in. for the intak e; 1.295 in. for th e exhaust.
S : E X H A U S T
A : IN T A K E