1986 305 timing tab
My '86 305's timing tab is pretty dirty and all I can see are the "teeth"; the numbers are covered. I think I know what the teeth indicate but want to be sure so I know I'm setting the timing I think I'm setting.
Think of each tooth point as a high spot and the halfway point between 2 teeth as a low spot. There's one low spot that's wider and deeper than the others; I believe this is TDC. The first tooth counterclockwise from TDC is 2 BTDC, the next one is 6 BTDC, and so on. The low spots represent 4 BTDC, 8 BTDC, etc. Currently at idle the mark corresponds with the 2nd low spot, meaning the engine's initial timing is 8 BTDC. Does this sound right? Thanks! Brad |
I don't know how much this helps, but I believe the white mark was pointing at TDC when I took this pic.
http://www.slonaker.net/images/truck/TDC.jpg I will be working on the truck tomorrow, and might be able to answer your question better then. BTW, mine is an '86 with a 305 also. Slonaker |
Thanks! According to the photo I'm correct about the location of TDC on the tab, so now all that remains is to verify that it's 4 degrees from tooth to tooth. If you could please check that tomorrow (as long as it's not an inconvenience) I'd really appreciate it.
Brad |
i wish i had a timing tab.....:lol:
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Brad -
Here's what I got for a timing tab for a 305. Maybe Slonaker will be able to confirm this. Hope this helps. |
is that 12 at the end?
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Brad |
That is why I asked if that was 12, I to thought that was 10 and it is past that. So my is probably around 14-15 initial!
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You're welcome, Brad. (Sure is it tight where the tab is located.)
1986Silverado - Yes, the last timing mark is a 12 (ie. 12 - 8 - 4 - 0 - 4). |
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