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I have seen time after time blocks that have been cleaned with out removing this plug in the pic as there are a lot 010 blocks that have a plug that is pressed in the block. And this is the main passage that feeds the cam bearings then the mains and rods.
As we have had 2 blocks in the shop that the mains and rod bearing were damaged do to debris. And after looking the blocks over these plugs were not removed and there is no way to properly clean this passage with out removing the plug.
We drill and tap the plug and pull it out and use a 9/16 drill and drill down to the counter bore and from there we use a 1/4 pipe tap and tap the hole.
Sorry the pic is blurry but the plug we pulled out is setting on the deck of the block and the tap is in the oil passage hole.
As we have had 2 blocks in the shop that the mains and rod bearing were damaged do to debris. And after looking the blocks over these plugs were not removed and there is no way to properly clean this passage with out removing the plug.
We drill and tap the plug and pull it out and use a 9/16 drill and drill down to the counter bore and from there we use a 1/4 pipe tap and tap the hole.
Sorry the pic is blurry but the plug we pulled out is setting on the deck of the block and the tap is in the oil passage hole.
