Engine Mechanical: 1D-49
2) Position the gaps of the three rings and side rails as
shown. Before inserting piston into the cylinder,
check that the gaps are so located.
3) Install the piston and piston pin. Refer to “Engine Top
Side Assembly (Page 1D-26)”.
Piston and Piston Ring Inspection
B817H21406034
Refer to “Piston Ring Removal and Installation
(Page 1D-48)”.
Piston Diameter
Measure the piston diameter using the micrometer at 15
mm (0.6 in) “a” from the skirt end. If the piston diameter
is less than the service limit, replace the piston.
Special tool
(A): 09900–20203 (Micrometer (1/100 mm, 50 –
75 mm))
Piston diameter
Service limit: 65.380 mm (2.5740 in)
Piston-to-cylinder Clearance
Subtract the piston diameter from the cylinder bore
diameter. If the piston-to-cylinder clearance exceeds the
service limit, replace both the cylinder and the piston.
Piston-to-cylinder clearance
Service limit: 0.120 mm (0.0047 in)
Piston Ring-to-groove Clearance
Measure the side clearances of the 1st and 2nd piston
rings using the thickness gauge. If any of the clearances
exceed the limit, replace both the piston and piston
rings.
Special tool
(A): 09900–20803 (Thickness gauge)
(B): 09900–20205 (Micrometer (0 – 25 mm))
Piston ring-to-groove clearance
Service limit: (1st): 0.180 mm (0.0071 in)
Service limit: (2nd): 0.150 mm (0.0059 in)
Piston ring groove width
Standard: (1st): 1.01 – 1.03 mm (0.040 – 0.041 in)
Standard: (2nd): 0.81 – 0.83 mm (0.032 – 0.033 in)
Standard: (Oil): 1.51 – 1.53 mm (0.059 – 0.060 in)
Piston ring thickness
Standard: (1st): 0.97 – 0.99 mm (0.038 – 0.039 in)
Standard: (2nd): 0.77 – 0.79 mm (0.030 – 0.031 in)
“D”: 2nd ring and lower side rail
“E”: Upper side rail
“F”: 1st ring and spacer
EX
IN
“D”
“E”
“F”
I718H1140146-02
“a”
I718H1140147-01
(A)
I649G1140262-03
(A)
I649G1140263-03
(B)
I649G1140264-03
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