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SKU 40963
timing listed in the manufacturer’s
specifications, adjust the timing.
Timing adjustment
With the Engine stopped, loosen the
1.
bolt that locks down the distributor,
but do not fully remove it. It should
be loose enough so that you can
rotate the distributor back and forth.
Do not over-loosen the bolt or allow
the distributor to move on its own.
Start the engine and run until it
2.
reaches the standard operating
temperature.
Figure 1
3. Direct the beam from the Timing
Light at the timing marks and slowly
rotate the distributor in very small
increments. Rotate the distributor
either right or left until the timing
lines
1
are lined up (in line with the
pointer).
(See Figure 1)
Stop the engine.
4.
1 Many vehicles have two timing marks:
One at TDC and another at 10° before
TDC.
Tighten the distributor lock down bolt
5.
using care not to change the position
of the distributor.
Start the engine and recheck the
6.
timing. If the timing is incorrect, the
distributor may have moved while
bolting it down. Reset the timing.
If you have no other tests to perform
7.
with the Timing Light, turn off the
engine and reconnect the vacuum
line. If you have further tests, first
check to see if the vacuum line needs
to be connected for those tests.
Testing centrifugal advance
With the timing light still connected
1.
and the vacuum line still not attached,
speed the engine up slowly to the
manufacturer’s specified speed for
this test (often 2000 RPM) and watch
the timing mark.
The timing mark should move
2.
steadily, without jumping.
(See Figure 1)
If the mark stays stationary or moves
3.
erratically, the Centrifugal Advance
(or other automatic timing advances)
should be repaired by a certified
mechanic.
Turn the timing advance knob on the
4.
back of the timing light up slowly until
the timing mark moves to
Tdc
or
0
.
The reading on the timing advance
5.
scale indicates the amount of
centrifugal advance. Compare with
vehicle service manual.
reV 07h, 09f, 09g