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T_estNumbeF !4-_DwelI Variation Test
Repeat
Test Number 13, Steps i-4
NOTE:
This test does not apply to transistorized ignition systems (except
those types using conventional contact points).
I.
Rotate the Function Selector Switch to the DWELL position.
2.
Disconnect and plug vacuum advance hose(s) as described in DWELL
Angle Test 13 on page 21
and 2_
3.
Operate engine at curb idle. ,,,lie observing DWELL scale for any
change in reading, increase engine speed to approximately 1500 RPM
and then return to idle.
4.
Reconnect vacuum advance hose(s).
8(
15
2O
25
3O
I0
35
5
40
0
,45
FIGURE 28
DWELL VARIATION
Variation on 4, 6, and 8=cylinder engines should not exceed 3 degrees.
if it does, check for:
a.
wear in distributor shaft
b.
wear in distributor shaft bushing
c.
wear in breaker plate
NOTE:
Manufacturer's specifications for some engines call for the
distributor vacuum advance hose to remain connected during the Dwell
Variation Test.
In this case, a maximum dwell variation of 6 degrees is
allowed unless otherwise specified by the manufacturer.
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