3) Run engine at specified idling speed and,
under this running condition, read vacuum
gauge. Vacuum should not be lower than
45 cm Hg (17.7 in. Hg).
A low vacuum reading means that any combi-
nation of following malconditions is the cause,
which must be corrected before releasing
machine to customer:
Oil Filler Cap
The cap has a packing. Be sure that packing is in
good condition, free of any damage and signs of
deterioration, and is tight
In
place: it is replacea-
ble.
(a) Leaky cylinder head gasket
(b) Leaky inlet manifold gasket
(c)
Leaky valves
(d) Weakened valve springs
(e) Maladjusted valve clearance
(f) Valve timing out of adjustment
(g)
Ignition mistimed
(h)
Carburetor improperly adjusted
NOTE:
Should indicating hand of the vacuum gauge
oscillate violently, turn adjusting nut
@I
to
steady it
4
Standard vacuum
45-
55cm Hg
(sea level)
(17.7
-
21.6 in. Hg)
Idling speed
BOO
f
50 r/min (rpm)
specification
(Take vacuum reading
at this speed.)
L
4) After checking, remove vacuum gauge.
5) Before reinstalling vacuum checking plug,
be sure to wrap its screw threads with
sealing tape and tighten plug.
3-57
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