Matching of Pistons

Matching of pistons





When matching pistons in the cylinder bores, use a 1/2" wide feeler gauge. For measurement, the cylinder bore should be lightly oiled and the piston, without rings, should be placed in the bore where it is to work. Hook a spring balance to the feeler gauge and insert the gauge between piston and bore at right angles to the gudgeon pin. When the pulling force is 8 - 12 N (1.8 - 2.7 lbs.), the mean value of the clearance coincides with the thickness of the feeler gauge. The test should be carried out at several different levels. In regard to piston clearance, see Specifications.