Honda NSA700A DN-1 2009, Service Manual

Page: 250 / 654

CAM CHAIN GUIDE
C heck th e c am ch ain g u id e fo r w e a r o r d a m a g e .
R eplace th e cam ch ain g u id e if necessary.
CYLINDER HEAD/VALVE_____________________
CAM CHAIN TENSIONER
C heck th e cam ch ain te n s io n e r fo r w e a r o r d am ag e.
R eplace the c a m ch ain te n s io n e r if necessary.
C A M C H A IN G U ID E
VALVE GUIDE REPLACEMENT
NOTE:
R efinish the v a lv e seats w h e n e v e r th e valve g uid es
a re replaced to p re v e n t u n e v e n s eating .
M a rk new v a lv e g u id e s at th e p ro p e r depth (see
specification b e lo w ) using a m a rke r.
Chill
new valve guides in a freezer fo r aDOut an
hour.
Using a torch to
H eat th e c y lin d e r h ead to 13 0 — 140°C (2 7 5 —
heat the cylinde r
290°F ) w ith a h ot p la te o r o v e n . Do n o t h e a t th e cyl-
head m ay cause
in d e r head b eyo n d 150°C (3 0 0 °F ). U s e te m p e ra tu re
warping,
in d ic a to r sticks, a v a ila b le fro m w e ld in g s u p p ly
s to res, to be su re th e c y lin d e r h ead is h eated to th e
p ro p e r te m p e ra tu re .
To a v o id burns, w e a r in su lated g lo v e s w h e n h a n ­
d lin g th e h eated c y lin d e r h ead.
Be ca re fu l n o t to
S u p p o rt the c y lin d e r h ead an d d riv e o u t th e old
dam age the g u id e s frc m th e c o m b u s tio n c h a m b e r side o f th e
cylinde r head, c y lin d e r head.
TOOL:
V a lv e g u id e d riv e r, 5 .5 m m 07742-0010100
C A M C H A IN T E N S IO N E R
V A L V E G U ID E DRIVER
9-18