14010
FIG. A.ll/7 REMOVING (INSTALLING) VALVES
AND SPRINGS
E.
Tool;
11.
Valve guide;
12.
Rocker arm lubrica·
tion feed hole; 13. Intake valve;
14.
Lower cup
for Intake valve;
16.
Spring;
17.
Upper· cup;
18.
Cup
(17)
locks;
19.
Valve rod cap;
a.
Remov·
lng the valve guide
with
hammer and drive bar;
20.
Stop ring
t'
in.
mm
I
. 315 8,023
.316
8,038
~
0
FIG. A.ll/8 MAJOR DIMENSIONS OF INTAKE
AND EXHAUST VALVES AND THEIR GUIDES
A. Final dimension
following
boring
of
valve
guide after press-fitting.
Valves (A) Intake
(S)
Exhaust
Oia.
X 1.7224-1.7323 in. 1.4469·1.4567 in.
43.750-44.000 mm.
36.750-37.000 mm.
FIG.
A.ll/9
GRINDING
A
VALVE
WITH
PNEUMATIC GRINDER
If valves, following a thorough cleaning, do not
ensure perfect tightness on their seats, grind
both valves and seats together (Fig. A.l/9), then
wash each part thoroughly
to
remove all traces
of
abrasive matter.
Extract the valve guides using the removal tool
(Item
a,
Fig. A.ll/7) from the underside
of
the
cylinder
head and withdrawing them with retain·
ing snap ring (Item
20).
Install them using the same
tool
but from the top
of
the cylinder head and stopping when the outer
ring prevents further introduction .
Inspect and check valve guides noticing that:
1.
The surface
of
the hole
of
each guide should
be absolutely
smooth
and free of scoring or
$eizure marks.
2.
The guides
must
be assembled in their
cylinder
head locations
to
a force fit;
if
not,
replace them
with
oversized ones (see table
of
data in Fig. A.ll/8).
3.
Following
installation always ream guides.
Springs,
the
specifications
of
which are shown
In
"Engine
Fits
and Tolerances" table, can be
taken down
without
removing cylinder head from
crankcase, in
which
case, care
must
be taken not
to
let
the valves fall Inside cylinders with
lowered pistons.
Engine·
18
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