Air Pump Air Cleaner; Air Pump - Datsun 620 Series 1977 Service Manual

Air
pump
aIr cleaner
The air cleaner element is
a
viscous
paper
lype
and
requires periodic
re
placement
The air pump air cleaner
is
bolted
to
the left front of
the hood
ledge
EC778
Fig EC 14 Air pump air c l e antr
Air pump
The
air
pump is
a
two
vane type
It
has two positive
displacement
vanes
which requires
no
lubricating seJVice
i
lJ1
I
Jr
l
Emission Control
System
The die
cast
aluminwn
air
pump
assembly attached
to
the front of
the
engine
is driven
by
an
air
pump
drive
belt A
rotor
shaft drive hub inlet and
outlet tubes
are
visible
on
the pump
exterior A rotor
vanes
carbon shoes
and
shoe
springs
make
up the
rotating
unit
of
the pump
The
rotor
located
in
the
center
of the
pump is
belt dri v en
The
vanes
rotate
freely
around the
ofT
center
pivot pin
and follow the
circular shaped
pump
bore
In
the
two
vane type
the
vanes
form
two
chambers
in
the
housing
Each
vane
completes
a
pumping cycle
in
every
revolu
tion
of the
rotor Air is
drawn
into the inlet cavity
through
a
tube
connected
to the air pump air
cleaner
Air
is
sealed between
the
vanes
and
moved into
a
smaller cavity the
com
pression
area
After
compression
a vane
passes
the outlet
cavity Subsequently
it
passes
the
stripper
and
a
section
of the
housing
that separates the outlet and
inlet cavities
and
again
reaches the
inlet cavity
to
repeat
the
pumping
cycle
Carbon shoes
in
the
slots of
the
rotor
support
the
vanes
They
are
designed
to penni
t
sliding
of the
vanes
and
to
seal the
rotor interior
from the
air
cavities Leaf springs which
are
behind
the leading side of the shoes
compensate for shoe abrasion
The
rotor ring
is
a
steel bolted
to
the
rotor
end It
positions ihe
rotor
and
holds the
carbon
shoes
The
vane uses
needle
bearings
All
bearings
have been
greased
There
are
two typCg
of
bearing
which
support
the rotor
Ball bearing
is used for the front
one
and the
needle bearing
is
used for the
rear
j
1 Air pump drive hub
2 HOII ing
3
Rotor
ring
4
End
cover
with needle
bearing
5 Vane
6 Carbon shoe
j
7
Shoe spring
8 Stripper
9
Rotor shan
10 Ball bearing
II Front bearing
cover
12
Pulley
13
PuDey for
air
con
itioner
EC560
Fig EC 15
Stctionol view ofoir
pump
twtrvone
type
EC
IO