EM-97ENGINE MECHANICAL Cylinder Block
INSPECTION AND REPAIR 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 or broken ring, clean the
piston ring grooves.
(c) Using solvent and a brush, thoroughly clean the
piston.
NOTICE: Do not use a wire brush.
2. INSPECT PISTON DIAMETER AND OIL CLEARANCE
HINT: There are three sizes of the standard piston diam-
eter, marked "1", "2" and "3" accordingly. The mark is
stamped on the top of the piston.
(a) Using a micrometer, measure the piston diameter at
right angles to the piston pin center line, at the
indicated distance from the piston head.
Distance:
1PZ and 1 HZ 58.6 mm (2.3071 in.)
1HD-T 65.7 mm (2.5866 in.)
Piston diameter:
STD Mark "1" 93.95-93.96 mm
(3.6988-3.6992 in.)
Mark "2" 93.96 - 93.97 mm
(3.6992-3.7000 in.)
Mark "3" 93.97-93.98 mm
(3.7000-3.7000 in.)
O/S 0.50 94.45 - 94.48 mm
(3.7185-3.7197 in.)
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