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ENGINE INSPECTION AND OVERHAULING
CylInder hAd
cowef"l
..
Cylinder head • •
V.Iv ....
SprInge ..
Valv. guldel
To take the
valve
guides
off the cylinder heads
use
the proper punch
(see
fig.
22).
The
valve
gui-
des
are
to
be replaced when
the clearance
bet-
ween
valve and valve
guide
is
not
avoided
by
replacing the
valves only.
To press
the valve guides onto the cylinder
heads
use
the
proper punch
(see
fig
.
23).
Heat
first the
cylinder heads
and
lubricate
the
valve
guides.
The
valve guides
pressed
,
ream
properly
the
inner bores (where
the
valve
stems
slide)
using
a
proper
tool in such
a way
to
bring
the
inner
13
at the exact
measure and data
which
are
given
in the table
hereunder
(see Drwg
. fig
.
348). The negative clearance between valve gui-
des and
cylinder
heads must be within mm
0,046
..;-
0,075.
COUPLING DATA BETWEEN VALVE AND VALVE GUIDES
(see
Drwg.
fig.
348)
VALVE GUIOE
INNER"
VALVE STEM"
ASS
EMBLING CLEARANCE
Inlet
8,000
..;-
8,022
7,972
..;-
7,987
0,013
-+-
o,osa
Outlet
7,965
..;-
7,980
0.020
"'
0.057
Vatve .. ats
The
valve seats
have
to be
reground with a
proper grinder
to
provide
a good
coupling
with valves.
The valve
sea.t·
inclination
angle
is
45'30'
±
5.
Vatv"
(see
Drwg.
fig.
348)
Ensure the clearance between
valve
stem and
valve guide
is within the right
limits.
The incli-
nation
angle of the valve
plate is
4S"3O'
±
5. The
plate
0
of inlet valve is
44 mm while the plate
0
of outlet valve is 37,000
-+- 37,100 mm.
175
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