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Parts & Service: 020 8988 7400 / E-mail: [email protected] or [email protected]
CHECKING DISTRIBUTOR CAM WEAR
1. This check is done after the timing has been set and the timing mark lines
up with the reference pointer for No 1 cylinder.
2. Connect the timing light to the lead directly opposite (180°) No 1 cylinder
on the distributor cap. (See figure 5 on page 8)
3. Start the engine and aim the timing light towards the timing mark. The
reading should be the same as when connected to No 1 cylinder.
4. If the reading is not the same, the probable cause is a worn out distributor
cam or a bent distributor shaft. Repair as required.
SMALL ENGINES
The DC power timing light can be used on any combustion engine with
impulse ignition or magneto ignition, such as motorcycles, lawn mowers,
outboard motors, or anywhere there is a high voltage spark used for ignition.
When 12 Volt DC voltage is not available from the engine being tested, an
external battery of 12V must be used. Connect a ground from the negative
post of the external battery to the engine. Connect the red clip to the (+)
positive terminal and the black clip to the (-) negative terminal of the battery.
Connect the adaptor lead of the timing light to the correct spark plug.
ROTARY ENGINES
The timing light can be used on rotary engines.
Follow the manufacturer's specific instructions and specifications. Figure 6 on
page 10 shows a typical procedure for the Mazda twin rotor engine.
1. Connect the Red (+) and Black (-) power leads clamps to the battery.
Connect the lead with the spark plug adaptor to the leading spark plug on
the front rotor housing.
2. Start the engine and run at idle speed.
3. Aim the timing light at the timing indicator pin on the front cover.
4. Loosen the distributor locking nuts and rotate the leading side distributor
body until the timing mark on the eccentric shaft pulley are in line with the
timing indicator pin.
5. Tighten the locking nuts and recheck the timing.
6. Repeat the above steps for setting the trailing side distributor timing with
the timing light connected to the trailing spark plug.
