[olopezm]

Hi Bob,

If I remember correctly the marks are on the harmonic balancer so you will have to remove the front passenger side wheel in order to be able to see them and would be a good time to check the rubber around the balancer.

I remember my dad used to put a mark with correction pen on the belt and that was what he used to check the timing on older cars. I've never done it myself so I can't comment any further on that.

If the balancer is bad you will see it instantly (the rubber will look like it's chipped) some times they even rattle or you can also see if it wobbles by moving it with your hands.

Oscar.