\._
Fig.1A
-5
Fig.
1A
- 6
. Fig.
1A-8
lA
1A-A-2.
Air Pump Drive Belt
a. Checking drive belt
If
the belt
is
broken, glazed or worn, replace the belt
with a new one.
If
the belt
is
stretched so that
it
cannot
be tightened sufficiently, install a new belt. If the belt
is
noisy, check the tension
of
the belt. Also, check
for misaligned pulleys.
b.
Adjusting drive belt
1. Loosen the air pump strap bolt and mounting bolt.
2.
Move
the air pump toward
or
away from the engine
until the correct tension
is
obtained.
Correct adjustment will permit the belt
to
flex 15,...,
18
mm
(0.6"'
0.7 in)
by
pressing with thumb (IO kg
:
22
lb) midway between the air pump pulley and
the water pump pulley.
For a new belt,
it
should be
11
"'
14
mm
(0.
4"'
0.6
in).
3. Tighten the strap bolt and the air pump mounting
bolt.
c. Replacing drive belt
1. Loosen the air pump strap bolt and mounting
bolt,
then move the air pump until the drive belt can be
removed.
2. Install a new belt and adjust the belt tension as
instructed in this paragraph.
1A-A-3.
Check Valve (Secondary air)
a. Checking check valve
1. Warm
up
the engine until
it
reaches normal oper-
ating temperature and
stop
the engine.
2.
Disconnect the air hoses (No. 1 check
valve
~
air
control valve, No. 2 check
valve
"'
air control valve)
at the check valve.
3. Start the engine. Slowly increase the engine speed
to
1,500 rpm and watch for exhaust gas leakage
at the air inlet fitting
on
the check valve.
If
there
is
exhaust leakage, replace the check valve.
b.
Replace check valves
Remove in the following order.
1.
Clip and hoses {disconnect)
2.
Check valves
Install in
the
reverse order
of
removing .
IA:
2
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