Re: ’56 Big Twin LU drain passage plugged

[fastjohn]

I have this problem with most OMC motors from this era. Some drain passages were packed so tight, it seemed like concrete. I normally use a long standard drill bit to open them( by drilling from the top down and measuring as I go to prevent drilling too deep) but have had to resort to a carbide tipped drill bit on occasion when a regular bit would not touch it. Make sure you drill straight, it is easy for your bit to wander and drill into the oil cavity–don’t ask me how I know.