Piper Cherokee Six - Page 699

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
2.
Obtain
a basic
measurement
from
the-top
of
the
ring
gear
by measuring
the
width
of
the
starter
ring
gear
plus
the
dimension
from
the
forward
machined
surface
of
the
ring
gear
to
the
forward
edge
of
the
compressor
or
alternator
(on
early
installations)
drive
belt.
(Refer
to
Figure
13-10.)
3.
The
check
and
adjustments
of the
compressor
and/or
alternator
drive
belts
require
different
procedures.
Refer
to following
appropriate
instructions.
f.
Compressor
Belt
Alignment:
(Refer
to Figure
13-10.)
1.
Place
the
straightedge
against
the
right
forward
side
of
the
ring
gear
and
measure
belt
alignment
at
compressor
sheave
(Point-B).
2.
Measure
belt
alignment
at
the
compressor
idler
pulley
(Point-A).
The
belt
misalignment
at
Point-A
should
be
half
the
misalignment
of
Point-B
and
the
dimension
at
the
top
of
the
ring
gear
and
in
the
same
direction
fore
and
aft.
3.
If
at
Point-A
nominal
misalignment
is
not
within
.030
of
an
inch.
as
obtained
from
step
2
add
or
remove
shims
as
required.
Belt
alignment
should
be
made
as close
to
nominal
as
shims
will
allow.
4.
On
earlier
installations,
insure
that
there
is
a positive
clearance
between
the
jam
nut
on
the
idler
pulley
shoulder
bolt
and
the
face
of
the
mounting
bracket.
Refer
to
paragraph
13-23
for
belt
tension
adjustment.
No
jam
nut
is used
on
newer
idler
pulley
bracket.
g.
Alternator
Belt
Alignment
-
Early
Installations:
(Refer
to
Figure
13-10.)
On
early
installations
there
are
no
provisions
for
shimming
the
alternator
and/or
the
alternator
idler
pulley
in
the
forward
direction.
On
later
installations,
shims
can
be
transferred
as required
from
forward
or
aft
of
the
alternator
mounting
lugs
to
achieve
alignment.
If
shimming
is
required,
insure
that
the
alternator
mounting
bolts
are
of
adequate
length.
For
present
installations
which
incorporate
the
new
bracket
assembly.
P/N
79584-02.
proceed
to
step
h.
Older
installations
must
still
follow
steps
1
thru
5
until
the
new
bracket
is used:
1.
Place
the
straightedge
against
the
left
forward
side
of
the
ring
gear
and
measure
belt
alignment
at
the alternator
pulley
sheave
(Point-C).
2.
If
at
Point-C
nominal
misalignment
is
not
within
.025
of
an
inch,
add
or
remove
shims
as
required
between
the
alternator
mounting
bracket
and
the
alternator
mounting
lugs.
(Refer
to Figure
13-10.)
On
later
installations,
transfer
shims
as required
from
forward
or aft
of
the
alternator
mounting
lugs
to
achieve
alignment.
3.
On
later
installations,
measure
belt
alignment
at
the
alternator
idler
pulley
sheave
(Point-D).
The
belt
misalignment
at
Point-D
should
be
halfway
between
the
misalignment
of Point-C
and
the
dimension
at
the
top
of
the
ring
gear
and
in
the
same
direction
fore
and
aft.
Earlier
models
provide
no
means
of
shimming
at
the
alternator
idler
pulley,
and
therefore
need
not
comply
with
this
paragraph.
4.
Alternator
Pulley
Skew:
(Refer
to
Figure
13-10.)
The
face
of
the
alternator
pulley
must
be
parallel
to the
starter
ring
gear.
If
skew
(misalignment)
is in
excess
of
.015
of
an
inch.
loosen
the
alternator
attachment
bolts
and
adjust
the
alternator
to
the
minimum
skew.
Tighten
the
mounting
bolts
and
safety
the
support
bracket
bolt
if not
already
safe
tied.
5.
The
belt
alignment
at the
alternator
pulley
should
be made
as
close
as
possible
to
the
nominal
alignment,
and
pulley
skew
is
to
be
held
within
this
alignment.
Refer
to
paragraph
13-23
for belt
tension
alignment.
h.
Alternator
Belt
Alignment
-
Present
Installation:
(Refer
to Figure
13-10.)
1.
With
the
alternator
belt
installed,
align
the
idler
pulley
in
the
belt
plane
by
adding
or
removing
shims.
P/N
62833-82
as
required.
Refer
to paragraph
13-23
for
belt
tension
adjustment.
Revised:
7/29/77
ACCESSORIES
AND
UTILITIES
3H9