driftxsequence

iTrader: (8)

So in the below picture the larger pulley is a factory 20b pulley, the smaller one is a FC Atkins serpentine kit. I have 3 bolts to make sure the pulley bolt holes match. Timing is pretty far off...the car has a FC front cover on it as well.
Did Mazda move the needle on the front cover?

Which mark should I use? Im regretting not buying the John blanch tool to set TDC.

driftxsequence

iTrader: (8)

Well, I used the stock 20b mark on the larger pulley and it runs much cleaner. I'm gonna guess timing was too retarded before.

diabolical1

iTrader: (3)

that's wild! glad you worked it out though.

do the 20Bs have an alternate method of locating TDC? you know, like on the 12As and 13Bs, the indent/flat area on the stock flywheel can be used if you need to.

driftxsequence

iTrader: (8)

I believe the 20b is just like the 13b where the keyway is at 9 o clock at TDC , the problem is if you have already assembled the motor you cant check where it sits in relation to the timing mark.

dguy

iTrader: (8)

This is why I always scribe marks on stock hubs that follows the keyway so even if someone has put different pulleys on one of my engines there's a non-invasive way of getting very close to TDC - disassemble the pullies and do it visually.