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V4.0
2.
The timing mark should remain stationary until the engine reaches the
manufacturer's specified speed. The timing mark should then move
steadily and without jerking.
3.
Reduce the engine speed and the mark should move steadily back.
4.
If the mark does not move or if it moves erratically, the centrifugal
(automatic) advance should be serviced as necessary.
5.
To check the maximum advance, it is necessary to mark the harmonic
balancer with the maximum degree per manufacturer's specifications and
follow manufacturer's procedures.
TESTING VACUUM ADVANCE
The vacuum advance tests if the distributor's vacuum mechanism will
cause each piston's spark plug to fire earlier as the engine's RPM increases.
The engine timing light remains connected and the vacuum line must be
properly installed.
1.
Set the engine speed fast enough to apply vacuum to the distributor.
2.
Aim the timing light and note position of the pointer.
3.
Disconnect vacuum line and the pointer should move.
4.
The distributor should be serviced if the pointer does not move. The trouble
may be a plugged line, a leaky diaphragm or a frozen distributor plate.
CHECKING DISTRIBUTOR CAM WEAR
Testing for wear in the distributor cam ensures that the timing is correct for the
even numbered cylinders that ignite while the odd numbered cylinders are at the
bottom of their cycle stroke.
1.
Ensure that the timing for cylinder number 1 is set and the pointer aligns
with the correct timing mark lines.
2.
Connect the timing light to the wire directly opposite (180°) cylinder
number 1 on the distributor cap (Fig. 5).
3.
Start the engine and aim the timing light towards the timing mark. The
reading should be the same as when connected to cylinder number 1.
4.
If the reading is not the same, probable cause is worn out distributor cam
or bent distributor shaft. Repair as required.
Visit www.princessauto.com for more information
Engine Timing Light
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