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PART
9-2-DUAL ADVANCE DISTRIBUTORS
9-17
Checking Dismantled
Distributor Components
Check bearing surfaces for wear
and replace worn parts. Remember
when checking the shaft bushing that
the lower bearing for the shaft is in
the engine block. New sintered bush-
ings
should be soaked in oil for an
hour before installation. Use the cor-
rect mandrel for pressing out and
replacing bushes. Test condenser by
means of a suitable tester. The brack-
et of the condenser must make good
contact with the distributor housing.
Contact points must be secure and
well aligned; adjust height with
shims.
Displaced contact points
should be aligned by means of a set-
ting tool. The rubbing block of the
contact breaker lever should not be
worn. Contact spring tension must be
tested with a spring balance.
Failure to comply with any one
of the above requirements makes it
necessary to replace the contact set.
Distorted or stretched advance
springs must be replaced with the
correct springs as the springs deter-
mine the advance curve which is
important to optimum engine per-
formance. The vacuum control unit
must be tested for leaks and, in the
event of a leak being found, the
complete unit must be replaced.
Reassembly
To assemble distributor reverse
disassembly procedure.
Important: Cleanliness is essential,
oil and grease must be kept away
from the electrical contact surfaces
and insulating parts.
The earth lead from the contact
breaker plate must be connected with
the housing by means of the screw
which secures the vacuum advance
unit.
The cam to driveshaft circlip can
be installed using a piece of 0.25
steel tube to press the circlip over
the shaft.
FIG. 3 - 6 Cylinder Bosch Distributor -Typical
Shaft End Float
Shaft end float must be adjusted to
specifications by placing or removing
shims from between the drive gear
and the housing
on
6 cylinder dist-
ributors or between
the drive
shaft
collar and
housing
on
8
cylinder
distributors.
Testing Advance Curve
The advance curve must be check-
ed to specifications on an approved
distributor test bench.
Centrifugal Advance
Adjustment is made by bending
the spring bracket at the cam to
increase or decrease spring tension.
A slot in the base plate gives access
to the spring brackets.
Vacuum Advance
The vacuum advance curve can be
tested by applying a depression to
the vacuum unit and reading the
degrees of advance on the scale.
The vacuum unit is not adjustable
and must be replaced if advance is
not to specification.
FIG. 4- 8 CYL ANTI-CLOCKWISE
ROTATION
FIG. 5-6 CYL. CLOCKWISE
ROTATION
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