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Old 02-22-2004, 07:44 PM
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timing problems

i have a gm 350 crate motor i set the timing by listening to the engine and how it ran, i put about 30 miles on it nothing over 55.
today i borrowed a timimg light and went to fine adjust the timing.
i hooked up the light and shot it ,the groove on the harmonic balancer was straight up when the light falshed. but i set the timing with the gauge on the timing cover thats to the side but when i shot the light its straight up , the engine runs good but i dont see why the mark is up with me setting it to the side?
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Old 02-22-2004, 08:49 PM
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From what I understand by your question, it seems you have a balancer that requires a late model timing tab that is almost straight up and down from the center of the water pump, and you have an earlier model tab that is on the side.
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Old 02-23-2004, 03:39 AM
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Did you dis-connect the vacuum advance hose from the vacuum cannister when you checked the timing with the light? Probably not. This is why the mark is not in the correct position. Always disconnect that hose and plug it when setting your timing. Re-connect it after the timing has been set.
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Old 02-23-2004, 05:49 PM
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well when i set the timimg the tab is on the side i start it up and shoot the light and i can see it pointing straght up but i set it to the side and yes i disconnected the advance
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Old 02-23-2004, 05:54 PM
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Sounds like the same problem that I have on my truck.
your damper has shifted.
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Old 02-24-2004, 03:46 AM
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Quote:
Originally posted by digitalfrek
well when i set the timimg the tab is on the side i start it up and shoot the light and i can see it pointing straght up but i set it to the side and yes i disconnected the advance
Wrong harmonic damper and/or wrong timing pointer.
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Old 02-24-2004, 09:43 AM
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digital,

what kind of harmonic damper did you install on your engine? Was it new or used?

What FASTCHEVY is saying, and this happened to me on an older balancer I had, is when the neoprene ring in the middle of the balancer deteriorates due to age or oil exposure, it can allow the outer ring on the balancer to spin around the axis of the crank. This will definitely affect where the timing tab shows up. If your engine is running okay, try revving it up to around 4K rpm real fast, and then letting it off, and see if it affects where your timing mark shows up. If this causes it to move to another location, then you need a new harmonic balancer.

Hope this helps

the blonde weasel
san diego, CA
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Old 02-24-2004, 07:15 PM
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it came off my 305 that had 295,000 miles on it
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Old 02-24-2004, 08:05 PM
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295,000 miles?! that is one h*ll of a good 305. with that kind of mileage on it, though, the chances of the outer ring slipping are better than good. more like for sure. try getting a neww balancer and re timing the engine. not only gets the timing right, but is a safety thing too. i saw one balancer come apart a 2500 rpm, and it wasn't pretty.
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Old 02-24-2004, 08:24 PM
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don't the 350 and 305 have different size dampners?
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Old 02-24-2004, 10:21 PM
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Yes and not only that but the 350's have two different one's, 6" and 8"
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Old 02-26-2004, 04:07 PM
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so the balancer is not solid?
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