7-74
Cylinder block
Checking the piston clearance
1. Measure:
• Piston diameter
See “Checking the piston diameter” (7-73).
• Cylinder bore
See “Checking the cylinder bore” (7-73).
2. Calculate:
• Piston clearance
Out of specification Replace the piston
or cylinder block.
Checking the piston ring
1. Measure:
• Piston ring dimension
Below specification Replace.
Checking the piston ring end gap
1. Measure:
• Piston ring end gap “a”
Above specification Replace.
Level the piston ring “1” in the cylinder using a
piston crown at the specified measuring point
“b”.
Cylinder
Bore
96.000–96.012 mm (3.7795–
3.7800 in)
Limit
96.072 mm (3.7824 in)
Piston clearance = Maximum cylin-
der bore – Piston outside diameter
Piston clearance
0.040–0.067 mm (0.0016–
0.0026 in)
Limit
0.167 mm (0.0066 in)
a. Top ring
b. 2nd ring
c. Oil ring
c
b
a
B
T
T
B
T
B
Piston ring dimensions
Top ring
Height (B)
1.170–1.185 mm (0.0461–
0.0467 in)
Width (T)
2.800–3.000 mm (0.1102–
0.1181 in)
2nd ring
Height (B)
1.170–1.190 mm (0.0461–
0.0469 in)
Width (T)
3.800–4.000 mm (0.1496–
0.1575 in)
Oil ring
Height (B)
2.400–2.470 mm (0.0945–
0.0972 in)
Width (T)
2.900–3.300 mm (0.1142–
0.1299 in)
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