1. To clean, remove the channel plugs. Then drive the sockets of the plugs with a countersink A.94016/10, put on the spindle A.94016, thoroughly rinse the channels with gasoline and blow with compressed air.
2. Apply UG-6 sealant to the surfaces of the plug sockets. Using mandrel A.86010, press in new plugs and, for greater reliability, caulk each plug at 3 points with a center punch.