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Perkins 4.99 - Flywheel Housing Procedures; Flywheel Housing Removal and Refitting

Perkins 4.99
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FLYWHEEL AND FLYWHEEL
HOUSING-P.2
P3
4.
Check
the
alignment
of
the
flywheel
face
by
posi-
tioning
the
gauge
as
shown
in Fig. P.1.
Turn
the
crankshaft
and
the
total
indicator
reading
for
the
flywheel
being
truly
at
right
angles
to
the
crank-
shaft
axis
should
not
exceed
0.001 in (0,025
mm)
for
every
inch
(25
mm)
the
gauge
stylus
is
reading
from
the
centre
of
the flywheel, i.e.
if
the
flywheel
has a
diameter
of
approx.
20
in
(500
mm)
then
the
stylus
will
be
approx.
10 in
(250
mm)
from
its
centre,
therefore
the
total
indicator
reading
should
not
exceed
0.010 in (0,25
mm).
5.
When the
flywheel
is
correctly
aligned,
lock
the
securing
setscrews
with
the
tabwashers.
To Remove the Flywheel Housing
1.
Remove the
flywheel
(Refer
to
previous
text).
2.
Remove the
starter
motor.
3.
Unscrew
the
securing
setscrews
and
carefully
tap
the
housing
clear
of
the
locating
dowels.
4.
Carefully
examine
the
housing
for
any
signs
of
cracks,
fretting
or
other
damage.
To Refit the Flywheel
Housing
1.
Ensure that the
rear
face
of
the
cylinder
block
and
the
mating
face
of
the
flywheel
housing
are
perfectly
clean
and
free
from
burrs,
etc.
2.
Locate
the
flywheel
nousing
carefully
on
the
two
dowels
and
refit
the
securing
setscrews.
3.
Mount
a dial
test
indicator
(clock)
gauge
with
the
base on the
crankshaft
flange
and
the
gauge
stylus
on
and
perpendicular
with
the
inner
face
of
the
housing
aperture
as
shown
in Fig. P.2.
Rotate
the
crankshaft,
the
inner
bore
should
be
truly
central
with
the
crankshaft
within
the
limits
listed
towards
the
end
of
this
section.
4.
With
the
gauge
base
still
mounted
in
the
same
position
adjust
the
stylus
so
that
it
is
at
right
angles
to
the
vertically
machined
rear
face
of
the
flywheel
housing
as
shown
in Fig. P.3.
Turn
the
crankshaft
and
check
that
this
face
is
at
right
angles
to
the
cranshaft
axis
to
within
the
follow-
ing
limits.
Check
dowel
location
in
block
and
housing,
ream
and
fit
oversize
dowels
where
necessary.
Diameter
of
Max.
Housing
Bore
Allowance
(total
indicator
reading)
Up
to
14{
in 0.006 in (0,15
mm)
(362
mm)
141
to
201 in 0.008
in
(0,20
mm)
(362
to
511
mm)
201.
ot
25!
in
0.010 in (0,25
mm)
(511
to
648
mm)
25!
to
31
in 0.012 in (0;30
mm)
(648
to
787
mm)
NOTE:
Any
adjustments
which
may
be
necessary
to
bring
the
flywheel
housing
within
the
limits
quoted
must
be
carried
out
on the
housing,
under
no
circumstances
may
the
rear
face
of
the
cylinder
block
be
interferred
with.
5.
When
the
housing
is
correctly
aligned
finally
tighten
the
securing
setscrews.
6.
Refit
the
flywheel
as
previously
discribed
on
Page
P.i.

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