Quote:
Originally Posted by MercFan
Understand, but why would there be a mention of needing a pilot hole... that's the confusion I guess. Will probably get a better feel for the job when the part arrives...
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Pilot Hole might be just a bad choice of terms; Every Tap has a certain size drill that you are supposed to use. If the drill is too big the there will not be enough metal left on the threads that the Tap cuts. If the drill is too small the Tap will not fit into the hole and you will have trouble getting it started or can bind the Tap in the hole and end up breaking the Tap.
You might try this if you think the threads that are left can be restored.
See Post #13:
striped threads on oil cooler