Distributor Insertion Techniques

Normally insertion of the Distributor is quite straightforward if you remember the angle you withdrew in the first place in exactly the same position when you withdrew it and provided the crankshaft had not been turned or disturbed since the last time you took the distributor off the cylinder head.
If the crankshaft pulley has been turned for whatever reason after the distributor had already been removed earlier, then it is imperative that you need to get the correct timing before inserting the distributor back into its fold.
The picture below can summarize quite a lot in terms of the explanation that entails with it :