Chim ignition timing
Discussion
Can anyone help with advice on the timinmg marks. They dont seem to make sense to me.
Just had the distributor out replacing the vacuum advance and ensuring it worked smoothly, now trying to set the ignition timing but the marks on crankshaft pulley dont make sense to me.
I can see the big groove (I presume its TDC) and on the pulley I can see 'AFTER' written and a few very indistinct marks - but can see no marks at all 'BEFORE'.
Advance mechanism certainly moves the timing away from 'BEFORE' and it runs (idles) as good as expected when ignition set up on the big groove. If I advance to the 28-30 degrees BTDC it runs like a dog.
Is my assumption correct that the groove is showing TDC ??
Just had the distributor out replacing the vacuum advance and ensuring it worked smoothly, now trying to set the ignition timing but the marks on crankshaft pulley dont make sense to me.
I can see the big groove (I presume its TDC) and on the pulley I can see 'AFTER' written and a few very indistinct marks - but can see no marks at all 'BEFORE'.
Advance mechanism certainly moves the timing away from 'BEFORE' and it runs (idles) as good as expected when ignition set up on the big groove. If I advance to the 28-30 degrees BTDC it runs like a dog.
Is my assumption correct that the groove is showing TDC ??
Thanks - Im not far out, but why would the pulley have 'AFTER' stamped in it and no 'BEFORE' marks. Cant think of any reason you would need to be after TDC.
I think I'll have to establish if this groove is indeed TDC and then buy one of those timing lights where you can programme the angle.
I dont have a clock gauge that can do this so it will be an estimate but I remember on old 4 cyl engines you established TDC on #1 by looking at the rockers on #4, is there a similar check on the V8?
I think I'll have to establish if this groove is indeed TDC and then buy one of those timing lights where you can programme the angle.
I dont have a clock gauge that can do this so it will be an estimate but I remember on old 4 cyl engines you established TDC on #1 by looking at the rockers on #4, is there a similar check on the V8?
Belle427 said:
From memory the large notch isn't tdc so that's your issue probably.
https://www.pistonheads.com/gassing/topic.asp?h=0&...
Ahhh, thats it! https://www.pistonheads.com/gassing/topic.asp?h=0&...
Edited by Belle427 on Monday 4th March 18:44
Perhaps a big assumption on my part that a groove in crankshaft pulley would be TDC. I only cleaned up the groove and either side of it - so never saw the other marks.
Many thanks - back on ot tomorrow
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