MOTO GUZZI V1000 G5 Workshop Manual page 43
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Also See for V1000 G5:
- Owner's manual (35 pages) ,
- Owner's manual (59 pages) ,
- Workshop manual (154 pages)
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•
Check
if
the valve stem-guide tolerance is still wi-
thin
the
specified
limits
(see table
~Valve-guide
cou-
pling
data"),
•
Check if the seats are
burnt out
or damaged in
such a way as to prevent tightness
_
For
valve
guide replacement
and
grinding
in of valve
seats.
see
para.
12.4
and
12.5.
12.4
VALVE GUIDES
The
valve guides are
best
removed from the head
by the aid of a
punch.
The guides have to be repla-
ced when the valve stem-guide clearance cannot be
taken up by the simple replacement of the
valves.
Valve guides are pressed
in
as
follows
:
•
Pre-heat the
cylinder
head
in an oven at about
SO'
C
(140"
F),
lubricate
the
guides,
and press them
home as
far as
possible
by the aid of a drilt.
•
Fit
the
snap
rings.
•
After pressing
In the
guides,
ream out the bores
where
the valve
stem
sl
ides to
the
size indicated in
lab Ie «valve-guide
clearances
..
,
fig. 44 and drawing
fig.
45.
Negative
allowance
between
cylinder
head and
val-
ve
guide should be
comprised 0.046-0.075 (.0017-
.0029").
Valve-guide
clearances
VALVE GUIDE
'/
0
Inlet
8.000-8.022 mm
(.3144-.3158")
12.5
VALVE SEATS
Change the
valve seats
if
pitted
.
Seat
angle
is 4S"30'±S'
for
both inlet
and
exhaust
valve.
After
re-facing,
for
a satisfactory
gas
seal
,
it
is
necessary to grind
in
the
seat
making sure
thai
no
grinding paste whatever
remains on
the
valve
stems
as this
will
cause in
a
short
time a
lapping
process
whilst the
engine
is
running.
At the
end
of
the
grinding operation, it is well
to
check if
the seat
is perfectly
gas tight. This is best
done by mounting the
valves
in
the cylinder
head
and pouring some petrol
into
the intake
and
exhaust
ducts.
watching
if any seeps
through
the valve seat.
12.6
VALVES
Check if
the valve stems are
scored or
damaged,
also the guide-stem clearance
is
within the
prescri-
bed limit.
Ensure the valve-head angle
is
4S"30'±S'.
VALVE
STEM
CLEARANCE
alA
.
ON ASSEMBLY
7.972-7.987 mm
0.013-0.050 mm
(.3199-.3143")
(.00051-.0019")
7.965-7.980 mm
0.020-0.057
mm
(.3134-.3140")
(.00079-.0022")
41
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