4.12.2. start and run the engine.
4.12.3. direct the timing light flash at timing marks and slowly rotate distributor right and left until the marks are aligned with the pointer (see figure 3).
4.12.4. stop the engine.
4.12.5. tighten distributor locking bolt taking care not to alter the position of the distributor.
4.12.6. start the engine and recheck the timing.
4.13.
tEsting thE CEntRiFUgAl ADVAnCE
4.13.1. With the timing light still connected and with the vacuum line disconnected, speed the engine up slowly and watch the timing mark.
it should remain stationary until the engine reaches the manufacturer’s specified speed. the timing should then move steadily and
without jerking (see figure 3). if the mark does not move, or moves erratically, the centrifugal (automatic) advance should be serviced as
necessary.
4.13.2. 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.
4.14.
tEsting VACUUm ADVAnCE
4.14.1. the vacuum line to the distributor must be connected to make this test.
4.14.2. set the engine speed to 800rpm or at the speed necessary to apply vacuum to the distributor.
4.14.3. Aim the timing light and note the position of the timing mark.
4.14.4. disconnect the vacuum line. if the timing mark does not move, the trouble could be a plugged line, a leaky diaphragm or a frozen distributor
plate. if so, the distributor should be serviced as required.
4.15.
ChECKing DistRiBUtOR CAm WEAR
4.15.1. this check is done after the timing has been set and the timing mark lines up with the reference pointer for 1 cylinder.
4.15.2. connect the timing light to the wire directly opposite (180º) 1 cylinder on the distributor cap (see figure 6).
4.15.3. start engine and aim the timing light towards the timing mark. the reading should be the same as when connected to 1 cylinder. if not,
the probable cause is a worn out distributor shaft. repair as required.
5. OPERAtiOn - smAll EnginEs
i
the timing light can be used on any combustion engine with impulse ignition, magneto ignition (motorcycles, lawn mowers, outboard
motors etc) or any time there is a high voltage spark used for ignition. When 12V dc is not available from the engine being tested, an
external 12V battery must be used.
5.1.
connect a ground from the negative (-) post of the external battery to the engine.
5.2.
connect the red clip to the positive (+) terminal and the black clip to the negative (-) terminal of the battery.
5.3.
connect the adaptor lead of the timing light to the proper spark plug.
6. tROUBlEshOOting
6.1.
All timing lights are 100% tested before they are shipped from the factory and improper operation is usually caused by incorrect hook
up. Please observe the troubleshooting procedure to perform satisfactorily.
Fig.4
Fig.5
Fig.6
sYmPtOm
PROBABlE CAUsE
sOlUtiOn
switch in ‘off’
position.
nO
FlAsh
nO FlAsh
BUt
DOUBlE
ChECK
inDiCAtOR
is “On”
light
FlAshEs
intERmit-
tEntlY
Battery clips connected
backwards.
Poor connection of
clips.
move switch to ‘on’
position.
make sure the clips
are connected to a
clean battery post.
reverse the battery
clip connections.
Wrong direction of
inductive lamp.
toward the arrow
on clamp to # 1 plug.
Weak ignition
or spark plug.
the gap is to close.
connect to other
plugs or spark plug
wires. if flashes then
repair the plug or gap.
faulty lamp
replace it
timing light high tension wire
lying on or to close to the other
spark plug wires.
Place the high tension
wire in good order so it
is routed away from the
other spark plug wires.
tl84, tl85 | issue:2 (l) 28/09/17
Original Language Version
© Jack sealey limited
