Fitting Pistons

When measuring piston for size or taper, measurement must be made on skirt 90° from piston pin hole. To check cylinder-to-piston clearance, insert a 0.0015" x 1/2" x 12" ribbon feeler gauge between inverted piston (pin removed) and cylinder wall at right angle to piston pin position. Force required to withdraw feeler gauge should be 3-12 lbs.