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Thu Jul 31, 2014 3:19 pm

I have a 1964 Type 3 notchback. The engine was rebuilt and the guide pin on the crank shaft pulley was worn out so the pulley was torqued on slightly off from the original position. The factory timing marks are not correct now but there is a new mark on the pulley that shows the new TDC point. The original has no TDC mark only 7.5, 10 and 12.5 degree marks. How do I find my new 10 degree mark to time my engine?

Can anyone help me???

Retired Notch

Thu Jul 31, 2014 3:45 pm

Someone has previously stated 12 degrees per "hump" on your pulley

Thu Jul 31, 2014 4:43 pm

Why not get a good used fan with a good pin?

Fri Aug 01, 2014 10:44 am

Thanks for your replies, but how does knowing that the humps are 12 deg. apart help me find TDC?

to get another pulley I would have to remove the engine again and I don't want to do that.

Fri Aug 01, 2014 10:50 am

Quote: there is a new mark on the pulley that shows the new TDC point.

Quote: how does knowing that the humps are 12 deg. apart help me find TDC?

So...do you have a TDC mark or not? you asked for help finding the 10 mark, one hump over from TDC is 12 degrees, so 2 degrees less is 10

Fri Aug 01, 2014 11:13 am

The only marks I have on the pulley are 7.5, 10 and 12.5, no TDC mark. Since the pin and the hole were the pin fits in was very worn out, when the pulley was put back it did not go on exactly the right spot. So the shop marked a new spot on the pulley that should be TDC. To get 10 degrees do I just go 10 deg. to the right of the new TDC mark on the pulley?

Fri Aug 01, 2014 11:23 am

Yes. Which is just slightly less than one hump over

Fri Aug 01, 2014 11:56 am

Thanks, I will try that.

Fri Aug 01, 2014 3:10 pm

Erik G wrote: Someone has previously stated 12 degrees per "hump" on your pulley

For clarification - there are 30 humps and 30 dips in the pulley/fan.
Each hump or dip is 6 degrees, or 12 from any point on one hump to the same point on the next.

The mark on the left is TDC (left edge of the hump), the red mark on the right is 30* BTDC (right edge of the hump)- spanning 3 humps and 2 valleys.

Fri Aug 01, 2014 5:25 pm

Thanks, that helps me, my pulley does not have the TDC mark. Now I know were it is.