Toyota 4Y 2006 Manual page 76

Crank axle
direction
c
Thrust
10 rnrn
(0.39 in.)
,24 rnm
Crank axle
Front direction
c
Thrust
2. Measure the six points shown in the left illustration, and find
the difference between the maximum and minimum values.
Limit: 0.05 mm (0.0020 in.)
3. Measure the piston clearance.
Measure the outside diameter of the piston.
Measurement position:
Measure the diameter at the place in a position 24 mm
(0.94 in.) from the top of the piston and orthogonal to
the piston pin.
Standard
STD:
90.925 to 90.955 mm (3.5797 to 3.5809 in.)
OIS 0.5: 91.425 to 91.455 mm (3.599 to 3.601 in.)
Measure the cylinder bore and calculate the piston
clearance.
Standard: 0.065 to 0.085 mm (0.0026 to 0.0033 in.)
If the value exceeds the limit, replace the piston or rebore
the cylinder and install an 01s piston.
Boring dimension
=
P + C
-
H
P: Outside diameter of the piston C: Piston clearance
H: Honing margin (0.02 mm [0.0008 in.] or less)
Inspection:
Inspect the piston and the connecting rod.
1. Measure the gap between the piston ring and the ring groove
along the entire circumference.
Standard: 0.03 to 0.07 mm (0.0012 to 0.0028 in.)
2. Press the piston ring into the sliding section of the piston, and
measure the piston ring gap.
Standard
No.1:
0.23 to 0.48 mm (0.0091 to 0.0189 in.)
No.2: 0.16 to 0.44 mm (0.0063 to 0.0173 in.)
Oil ring: 0.13 to 0.47 mm (0.0051 to 0.0185 in.)