tictor Posted April 1, 2014 Share Posted April 1, 2014 Hi there, My engine is finished but the drain plug is so hard to screw in that i suspect the tread to be quite dead!Do you guys know the thread size ? so i can buy an adequate tap ? Quote Link to comment Share on other sites More sharing options...
Richard B Posted April 1, 2014 Share Posted April 1, 2014 3/8" NPT National Pipe (Tapered) 18tpi Quote Link to comment Share on other sites More sharing options...
tictor Posted April 1, 2014 Author Share Posted April 1, 2014 Thanks Richard ! Quote Link to comment Share on other sites More sharing options...
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