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GTJIM · 05-25-2008

That hole has been plugged at the factory by driving an ali (or steel!!) plug into it - no threads!
It is always a good idea to remove oil gallery plugs, clean out the drilling behind them and replace the drive-in plug with a threaded one.
Often short in-hex (Allen head) grub screws can be used - just measure the hole size and select a thread size with the tapping drill closest to the existing hole measurement.
OR 1/8" BSPT (or NPT!!) hex pipe plugs as used in air valves can often be used.

05-25-2008	#8 (permalink)
GTJIM Old Opeler Join Date: Jun 2003 Location: New Zealand Posts: 5,686	Yep ... That hole has been plugged at the factory by driving an ali (or steel!!) plug into it - no threads! It is always a good idea to remove oil gallery plugs, clean out the drilling behind them and replace the drive-in plug with a threaded one. Often short in-hex (Allen head) grub screws can be used - just measure the hole size and select a thread size with the tapping drill closest to the existing hole measurement. OR 1/8" BSPT (or NPT!!) hex pipe plugs as used in air valves can often be used. __________________ GTJim Opel Owner since last Century! Copyright © 2000-2009 J D Henry All Rights Reserved Last edited by GTJIM; 05-26-2008 at 06:32 AM.