> There is a gear on center of crankshaft that > drives 2 gears in a casting that bolts on under > crankshaft.
> What is it?
> There are some timing marks, how would I time > it?
Line the one on the driven gear up with the one on the crackshaft gear with #1 at TDC on compression. Hopefully you have not taken the balancer apart. There may be shims to adjust backlash: don"t lose them (and don"t mix them up: one has a hole in it). This is all in the engine service manual (which you should have) on page 1-36.