09-05-2022, 06:49 PM
Just spent several intermittent hours trying to stop my "M" type pump from leaking engine oil. Removed several times and checked/renewed gaskets although no defects were found. Noticed that the oil drain hole below the main opening for the cam lever arm was partially blocked by the original gasket , and the drain gallery from the pump too it. Modified both to improve drainage. Refitted and road tested .STILL got oil leak. This time however, found oil weeping from tappet cover immediately above the pump. Not seen this dripping before. It ran down directly onto pump flange . will attend to this tomorrow, hoping that it's the dammed leak. Can't believe I didn't spot it earlier. Thought you might like too know, so you can check your T'cover in case.