In disecting your project, you often come across a weak starting issue. In many cases, it is because of a flywheel ring gear being worn out. Here is a perfect example where the flywheel ring gear is nearly completely worn out.

It is important you know how to replace the ring gear. And replacing the ring gear is not a difficult task. Here we show the new 97 tooth ring gear with the new replacement.

First, you will need tools as follows: a torch to heat the ring gear off and heat the new one on; gloves; hammer; punch and 4×4 block of wood

The first thing to do is place the flywheel on the 4×4 block of wood. Heat the ring gear for about 2 passes all the way around the ring with the machined side up. This will expand the ring from the flywheel.

Second, turn the torch off, and quickly tap the ring from the flywheel. This should only take a couple of taps around the ring and the old ring gear should fall off.

Third, turn the flywheel over with the machined side down, then place the new ring gear on the flywheel (which is still on the 4×4 block), the ring gear should be a little short of fitting on the flywheel.

Fourth, heat the ring gear up with a torch (as you did before taking it off). The ring gear will expand enough after you take about 2 passes around the gear.

Fifth, turn the torch off and grab your punch and hammer and tap the ring gear evenly around the flywheel. After tapping the new ring gear on the flywheel it should cool off and tighten up around the fidanza flywheel. And when you finish all the above steps, you will see a new ring gear in perfectly good condition.