Toyota 2VZ-FE, Manual

Page: 81 / 324

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 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 diameter, 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, 24.25 mm
(0.9547 in.) from the piston head.
Piston diameter:
STD Mark “1” 87.445–87.455 mm
(3.4427–3.4431 in.)
STD Mark “2” 87.455–87.465 mm
(3.4431–3.4435 in.)
STD Mark “3” 87.465–87.475 mm
(3.4435–3.4439 in.)
O/S 0.50 87.945–87.975 mm
(3.4624–3.4636 in.)
(b) Measure the cylinder bore diameter in the thrust
directions. (See step 5 on page EM–77 )
(c) Subtract the piston diameter measurement from the
cylinder bore diameter measurement.
Standard oil clearance: 0.045–0.065 mm
(0.0018–0.0026 in.)
Maximum oil clearance: 0.085 mm (0.0033 in.)
If the oil clearance is greater than maximum, replace all the
six pistons. If necessary, rebore all the six cylinders or replace
the cylinder block.
EM-79
ENGINE MECHANICAL – Cylinder Block