These timing lights use electronics to delay the The next level up from a basic timing light is what isĬalled a dial-back light. Onset of the spark based on how much delay is dialed in on the light. Originalĭial-back lights used a simple dial with a timing scale. The more sophisticated electronic dial-back lights offer aĭigital screen usually at the back of the gun that will display rpm and theĪmount of timing delayed. Upscale versions will also display battery voltage.īefore we get into how to use a dial-back light, we should run through why they are needed in the first place. Most engines use a timing tab that is welded or bolted to the front timing chain cover. The tab will offer several hash marks indicating the number of degrees of timing before top dead center (BTDC). These tabs can also display timing after top dead center (ATDC). Sometimes the tab will be marked with a ‘B’ for before and ‘A’ for after. A does not mean advanced - in fact, ‘After’ is the exact opposite. If you want to set initial timing at something more than 10 or 12 degrees indicated on the tab using a traditional timing light, this becomes a guessing game. Plus, you may also want to know what the total mechanical advance is and at what rpm it occurs. This can be done with a degreed balancer, but these are expensive. Check to see if there’s someplace local that has a tester for it.MSD offers a series of adhesive tapes for each popular balancer diameter which are accurate enough to use in lieu of a dial-back light. Even though it passed a visual, if it had a lot of miles it may be worn enough to jump just a bit. I’m assuming this is a problem in the ignition system somewhere, but I’m kind of lost on where to go from here.Īs the timing gears/chain are new, I’d test the old distributor. Everything else in ignition system is the old parts too.Įverything else seems to be functioning well. (teeth looked ok, and there’s no play where there’s not supposed to be). Used old distributor, but it passed the visual inspection. New cap, rotor, spark plugs, and spark wires. I cleaned fuel injectors before installing. It’s a brand new timing light… Not the nicest one… $30 from harbor freight. Supposed to be 10 degrees btdc, I can get it fairly close, but it’s fluctuating back and forth 2-3 degrees. When I put the timing light to it to fine tune it, it is jumping around a little. Just had engine rebuilt and did the run in. As far as the timing gear goes… I had machine shop rebuild engine for me and they set the timing chain up (and were supposed to set timing). The only question I didn’t understand is about timing gear marks at 6-12 o’clock… U mean the actual timing gear where timing chain is? Or on the harmonic balancer? (on the balancer I lined it up to 10 degrees btdc when I found compression stroke). I’ve tried asking around, can’t find anyone to borrow another timing light from. Distributor locked down (had it just loose enough to turn it at first but checked again after tightening and getting same result). Spout connector is unplugged while setting timing. Then I would leave it.unless an issue occurs. Timing light? If it looks like its jumping and the truck runs right Line up to #1 on the distributor? If your doing the procedureĬorrect and all the above is correct.can you barrow a different When the marks line up and the engine is at tdc. When your checking the timing and its jumping.is the spoutĬonnector in or out? timing gear marks are 6-12 o’clock?
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