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Valve
Grinding
7
Before
replacement
of the
cyhnder
head
the
valves and theIr
seats
should
be
exammed for SIgnS
of
pIttIng
or
burnt
patches
and distortIon
If
these condItIOns
are
present
the
valve
seats must
be
recut
before
attempt
mg
to
gnnd
m
the valves
whllst dIstorted valve heads should
be trued
or
the
valve
renewed
Only
the
mmlmum amount
of
metal
should be removed
m
the
turnmg
process
When
gnndmg
a
valve
onto
ItS
seahng
the valve face should be smeared
hght
ly
WIth
gnndmg
paste and
then
lapped
m
With
a suctIon
type
gnndmg
tool
The
valve
must
be
ground
to
us
seat
WIth
a semI
rotary
motIron
A
hght
COlI spnng
mterposed
between the valve
head
and
the
port WIll
assist
conSIderably
when
hftmg
the valve
m
order
to
rotate
the
face
to a
dIfferent pOSItIOn
ThIS should be done
frequently
to
spread
the
gnndmg compound evenly
It
IS
necessary
to
contmue the
gnndmg
process
untIl
an even matt
surface
IS
produced
on
the
seatmg
and the
valve face
On
completIon
the valve
seats
and ports should
be
throughly
cleaned
With
gasohne
soaked rag
and
dned
and
the
subjected
to
a
compressed
aIr
blast
The
valves should
be
washed
m
gasohne
and all
traces
of
gnndmg compound
removed
VALVES
Valve
head
dIameter
Intake valve
Exhaust valve
Valve
seat
WIdth
Valve
stem
outer
dIameter
both
mtake and
ex
Overall
length
Intake valve
Ex
valve
34 798 34 935
mm
1 370 1 375
m
30
023 30 ISO
mm
1 182 1 187
m
1
63 iO 015
mm
8
6805
8 6932
mm
0 341 3
4
0 342 1
4
m
J
109 54
mm
4
5 16
m
108 74
mm
4
9 32
m
VAL
VE
GUIDE
Length
Intake valve
Exhaust valve
Outer dIameter
both mtake
and
exhaust
Inner dIameter
both
mtake
and exhaust
Inner dIameter
at
gUlde
mlet
to
msert
both
mtake
and exhaust
Clearance of valve
stem
and
guIde
both
mtake
and
exhaust
47 63
mm
1
7 8
m
57 94
mm
2 9 32
m
14
313 14 440
mm
0 5635 0 5685
m
8 733 8 860
mm
0 3438 0 3443m
14 3
mm
0 5634
m
O 0394 0
0648
mm
0 0015 0 0025
m
23
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