SNIPS...

I recall that the innermost oem front (now aircraft rear in tractors?)
pulleys only go on only one way in many late model engines (perhaps not
all, esp if an aftermarket pulley is put on, or you intermixed parts) as
Mazda obviously thought of this item for rebuilding-I thought that was
very perceptive of them! The pulley screw holes won't line up with the
flange on the eccentric shaft wrong and you cannot put the pulley on
wrong for the timing marks to mount to the eccentric shaft. Also the
keyway on the back of the engine is straight up at 0 degrees (13Brewtt,
haven't check on 20B but suspect it is also) and that is the same
location of the timing mark on the 'front' pulley as well. You have to
observe this before you mount the flywheel/counterweight.

So if you install the eccentric shaft correctly then installing the
distributor rotor is easy since the firing points are observable. You
know what the firing timing is supposed to be, so adjust rotor to give x
degress for firing purposes. Then use timing light to final adjust. I
believe that is what I did and it worked!

Mine fired on first try after rebuilding and I have never changed the
timing! I don't think Bruce's video covered this, I just discovered it
myself when rebuilding a 1991 13B a couple of years ago myself. I
enjoyed the experience.
[Marc Wiese]

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