ENGINE SYSTEMS
57
3) Cylinder block
Inspection and service
(1) Check for crack, damage and distortion on the top of
the block in the same way as in the cylinder head.
(2) Measurement of cylinder bore
➀ There should be no scratch, rust, corrosion, etc. on
the cylinder bore when checked visually.
➁ Measure the cylinder bore at the top, center and
bottom respectively in the crankshaft direction (A)
and the direction at right angle to it (B). If the repair
value is exceeded, replace to the long block.
➂ The above-described bore top corresponding to the
top ring position at the piston TDC about 10 mm
below the cylinder block top surface, and the
bottom corresponds to the oil ring position at the
BDC about 100 mm below the cylinder block top
surface.
➃ Use a cylinder gauge (inside dial gauge) for the
measurement. Apply the gauge correctly at right
angle to the bore wall surface.
19
(Unit: mm)
Distortion on cylinder block top surface (mm)
Standard assembling value Repair value
Less than 0.05 More than 0.12
Model
Standard assembling
value
Replace value of
long block
S753
∅75 - ∅75.019 ∅75.2
S773 ∅77 - ∅77.019 ∅77.2
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