3-14. PISTONS, PISTON PINS AND RINGS - REPLACE (Cont’d) 3. CHECK TOP PISTON RING FOR NICKS, CRACKS OR OTHER VISIBLE DEFECTS.  RING CLEARANCE CHECK IS NOT REQUIRED FOR TOP PISTON RING. 4. CHECK RING CLEARANCE IN INTERMEDIATE AND OIL CONTROL RING GROOVES USING NEW RINGS AND A FEELER GAUGE (12) AS SHOWN. MAXIMUM ALLOWABLE CLEARANCES FOR THESE TWO GROOVES ARE: a. Intermediate ring groove - 0.006 inch. b. Oil control ring groove - 0.005 inch. 5. CHECK PISTON PIN BORE DIAMETER (13) AT FOUR POINTS NOTED.  MAXIMUM ALLOWABLE BORE DIAMETER IS 1.5758INCH. 6. CHECK PISTON PIN (2) DIAMETER AT SIX POINTS AS SHOWN.  MINIMUM ALLOWABLE 3-96