I've got a S2 that I need to check the ignition timing on, unfortunately at some point someone has fitted a Gilmer drive on it, while it looks the part this also means that there are no timing marks.

Is there anyway to set it without them / make my own marks? Or am I best looking for a 12a crank pulley.

Cheers
Rich

 

https://www.rx7club.com/1st-generati...-drive-650016/

 

I thought I replied last night but my computer must have had a fit.

I did search and already read that thread, but its not that clear to me. Do I make the mark at the top of the pulley at TDC and then use that mark to time it using the timing pin on the front cover?
What about the trailing timing, doesn't there need to be a separate mark to check that?

Cheers
Rich

 

Once TDC is found, the pulley needs to be marked. I'm not sure on the trailing mark but you could just mark off degrees, say in 5 degree increments.

Find the circumference of the pulley (C=2 π r). Then mark off the degrees of pulley in one degree increments. This would be done if you want to advance/retard by x degrees.

You might get lucky and the e-shaft hub could have a locating hole. The early once had this to align the pulley. It used an aluminum type rivet that got mushroomed. Of course you would also need the pulley with the locating hole.

 

I'm going with the simplest and probably best option, the PO still has the original pulleys in his garage apparently so I'm going to just refit those while I time it up, it''s going to be a lot more accurate than me trying to scribe the angles on and what not.

 

Easiest solution, if you have access to original pulleys, is to put the original pulley on, rotate the motor until it lines up with the pin, then put the new pulley on and scribe a mark in the same spot and add a dab of paint or permanent marker. Repeat for the trailing mark.

 

They're turning up tomorrow so that's a good solution if I decide to keep this Gilmer drive, thanks.