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1) If the valve face shows that the valve
Sat |3 cantared on the valve face. but
lov wade, hen lightly ase goth the
FLAT" and the 320° cuters to reduce
the seat width to 1.1 mm (0,043 in)
2) If the seat shows to be in the middie of
the valve fane. but too narraw. use the
45° cutter until the width equals
1.1
mm (0.043 nj
3) If the seat Is t09 norrow. and right up
vwar the valve margin, then firs: use the
FLAT" cutter and then the 45° cutte-
to get the correct scat wieth
4) If the seat is too narrow snc down nea
to bottom edge of the
velve face, then
first use the 30> cutrar and chen the
45" cutter
7. Lapping the valve/valve seor assembly
@, The valve/valye seal assembly
should
ne lapped if, (1) neither t1¢ seat or the
valve face ore severely worn. or: (2) if
the valve face and valve seat have
Deen resurfaced ene now require 8
fins| |ighs grinding operat or for perfect
sealing
b. Apply @ small amount
of coarse lap-
ving compound zo the valve face. In-
sert the valve into the head. Rotate the
valve until there is a burnished spot all
the way arcund tne valve face. Clean off
the coarse compound.
then follow the
same procedure with fine compound.
Continue lapping until the valve face
shows a complete and smooth
surtace:
all the way around. Clesn off all com:
pound material.
Apply bluing dye to the valve tace and
rotate the valve face for full soet contact
which is indicated by a shiny surface all
around the valve face where the bluing
has been rubbed away
3a
Camshaft and Camshaft Bearing
1. Flatten ths lock washer
2. Loosen and remove the
bearing retain
ing bolts.
osert 2 19 mm (0.39 in} screw into the
camshaft and withdraw the camshaft
4 Camshaft
Thy
cain ove metal surface may have @
blue disceloration due to excessive fric-
tion. Tho metal surface could also start
Wc flake off of become pitted, This is due
te poor lubrication, incorrect clearances,
or normal wear.
b. If any of the above wear conditions are
readily visible, the cemshaft should be
replaced.
© Even though the cam lobe surface
appears to be in satistactary condition,
the lobes should be measured with a
micrometer. Cam lobe wear can occur
vithout scarring the surface. If this
wear exczeds a predetermined amount,
valve timing and lift are aflected. Re-
lace the camshaht if wear exceeds the
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