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I intended to save this for a thread about "Mistakes to Learn From" but I'll ask my question instead.
Installing my headers, I loosened the bolts holding the starter on so that I could lower it an inch. After installing the headers and being excited to hear them, I put everything back together and forgot to raise the starter back to the original position... Whoops...
The Vette started but made a rough, grinding noise when it did. I immediately knew that I had forgotten to tighten the bolts and fixed it. My '75 starts fine, but will occasionally make the awful grinding noise. It seems to make the noise more often when I am starting it after it was shutdown a couple hours or less earlier.
So, what did I ruin? Hopefully I ruined the starter and not the flywheel. What do you think the problem is?
It's definately one of the two that has teeth worn on it. Or it could be both. I would pull the sarter and put in a new bendix (the part that kicks out and includes the gear). That may fix the problem. You can examine the flywheel teeth while the starter is out too.
Sounds like you may have just beat the ends of the flywheel teeth a bit.
Remove the inspection cover and check if the teeth still have their square edges. Rotate the engine and check them all.
If rounded, then a small file will remove the rounded edges.
Flywheel teeth are actually quite soft.
The grinding noise you hear is likely the starter gear not engaging the teeth in the flywheel due to the rounded edges interfering.
Likely only a few teeth on the flywheel is the cause. When the engine happens to stop at that spot, you then get the problem.
Barry