Make Use Of A Variable Timing Light

Variable timing lights are bounteous conversant and accurate than criterion timing lights.

Timing lights fit a measurement for engine ignition timing. They are used to synchronise the firing Glimmer to the compression of the engine cylinder. They custom an inductive strobe flashing to string up marks on the crankshaft pulley, or harmonic balancer, with a string on a measurement tab located on the block. The distance between the two marks shows the magnitude of degrees. A variable, or adjustable timing glossy has a naked truth which allows the operator to preset the Correct measure setting, according to the manufacturer's specifications. This takes the guesswork away of the habituation.


1. City the transmission selector on your vehicle in impartial or grounds. Exercise the emergency brake and uplift the hood. Disconnect the balky battery cable with a socket. Refer to your owner's service manual for your recommended timing setting in degrees. You might find the specification listed on a plastic sticker or placard affixed to the fan cowl or radiator support frame. The timing number will be listed in degrees, such as 12 degrees BTDC.

2. Haul a quantity of ashen chalk and point the string on the pulley, so it appears plainly visible. Stare at the timing purpose tab. You Testament gaze graduated measure lines, inception with "0" in the Centre. The measure marks on one side of the column Testament be indicated by an "A" or "AFT," which funds after top dead centre (TDC). The measure lines going in the contrary plan Testament be pronounced with a "B", or "BF," or some variation, and they present degrees before TDC.

3. Point the "0" path on the timing tab with the chalk. Reconnect the refusal battery cable with a socket. Hook up the counteractive (coal) guidance of a variable timing light to the negative lead on the battery. Hook up the positive (red) lead of the timing light to the positive lead on the battery.

4. Refer to your owner's manual for the proper location of your engine's number 1 cylinder. It might be on the left or right side of your engine as you face it. Take the conductive clip on the timing light and clip in around the number 1 wire.

5. Locate the distributor and look down at its base where it enters the engine block. You will see a distributor base clamp held by a bolt. Use a socket and extension to loosen the bolt only enough To admit the distributor to rotate slightly. Do not turn the distributor any great amount -- only enough to test its movement, which should require medium hand pressure.

6. Pull off the vacuum hose on the side of the distributor that attaches to the vacuum advance diaphragm. Plug the end of the hose with a small bolt. Start the engine and let it warn up to operating temperature. Make sure the choke deactivates completely.

7. Establish the crankshaft pulley (harmonic balancer) at the front, lower thing of the engine. Application a rag To cleanse the border of the crankshaft pulley and the metal timing site tap above it. Contemplate for a straight path etched across the pulley. Provided you effect not eye one, appropriateness a substantial socket and breaker bar to turn the copious pulley follower until you peep the string speck.

8. Pick up your variable timing light and Stare at the digital scale in the window and adjustment knobs. The adjustment might be indicated with push-button arrows that show up and down directions to advance or retard the timing. The timing light might have a dial, which turns. Check the instructions.

9. Adjust the dial or buttons until the proper amount of degrees shows on the timing light window. Remember that it will indicate BTDC and ATDC. In most cases, you will need the BTDC selection. Point the timing light down at the crankshaft pulley and look where the strobe lights illuminate the chalk marks. The chalk marks should align the crankshaft pulley mark with the "0" mark on the timing tab. If they do not align, manually rotate the distributor until both zero marks align. Shut the engine off.

10. Tighten down the distributor base bolt with a socket and extension. Start the engine. Recheck the timing marks to make sure they have not changed. If they align, shut the engine off. Pull the bolt from the vacuum line and reconnect the line with the vacuum advance diaphragm on the distributor. Unhook the timing light leads.