2. Measure: piston-to-cylinder clearance MMM M M MMM M M MMM M M MMM M M MMM M M MMM M MMM a. Measure the cylinder bore “C” with a cylin- der bore gauge. NOTE: _ Measure the cylinder bore “C” in parallel to and at right angles to the crankshaft. Then, find the average of the measurements. b. If out of specification, replace the cylinder, and the piston and piston rings as a set. c. Measure piston skirt diameter “P” with the micrometer. a 10 mm (0.39 in) from the bottom edge of the pis- ton d. If out of specification, replace the piston and piston rings as a set. e. Calculate the piston-to-cylinder clearance with the following formula.
Piston-to-cylinder clearance = Cylinder bore “C” – Piston skirt diameter “P” Piston-to-cylinder clearance 0.030 ~ 0.055 mm (0.0012 ~ 0.0022 in) : 0.13 mm (0.051 in) 4 - 36 CYLINDER AND PISTON ENG Cylinder bore “C” 102.000 ~ 102.010 mm (4.0157 ~ 4.0161 in) Taper limit “T” 0.05 mm (0.002 in) Out of round “R” 0.05 mm (0.002 in) “C” = Maximum D “T” = (Maximum D or D ) 1 2 – (Maximum D or D ) 5 6 “R” = (Maximum D , D or D ) 1 3 5 – (Minimum D , D or D ) 2 4 6 Piston size “P” Standard 101.955 ~ 101.970 mm (4.0140 ~ 4.0146 in)