EM/Engine Mechanical — Inspection of Piston and Connecting Rod Assemblies, page 77

INSPECTION OF PISTON AND CONNECTING
ROD ASSEMBLIES

1. CLEAN PISTON
   (a) Using a gasket scraper, remove the carbon from the
       piston top.

   (b) Using a groove cleaning tool or broken ring, clean the
       ring grooves.

   (c) Using a soft brush and solvent, thoroughly clean the
       piston.
       NOTICE: Do not damage the piston.

2. INSPECT PISTON DIAMETER AND OIL CLEARANCE
   (a) Using a micrometer, measure the piston diameter at
       a right angle to the piston pin hole center line, 22 mm
       (0.87 in.) from the piston head.

HINT: There are five sizes of standard piston diameter,
marked "0", "1", "2", "3" and "4" accordingly. The
mark is stamped on the piston as shown in the illustration.

7M-GE
Front Mark
Front
Piston
Size Mark
(0, 1, 2, 3 or 4)

EM5543
EM5426
EM5527
EM17302
EM5744

22 mm