CYLINDER BLOCK - Inspection (Cont'd)

EM-191prose procedure

Inspection (Cont'd)

IMPORTANT

When any cylinder needs boring, all other cylinders must also be bored.

1
Determine piston oversize according to amount of cylinder wear. Oversize pistons are available for service. Refer to S.D.S.
2
The size to which cylinders must be honed is determined by adding piston-to-cylinder clearance to the piston skirt diameter "A".
Dimension "a": 10.6 mm (0.417 in)
Rebored size calculation: D = A + B - C = A + [0.003 to 0.023 mm (0.0001 to 0.0009 in)] where, D: Bored diameter, A: Skirt diameter as measured, B: Piston-to-wall clearance, C: Honing allowance 0.02 mm (0.0008 in)
SEM181B
3
Install main bearing caps in place, and tighten to the specified torque to prevent distortion of the cylinder bores in final assembly.
4
Cut cylinder bores.
Do not cut too much out of the cylinder bore at a time. Cut only 0.05 mm (0.0020 in) or so in diameter at a time.
5
Hone the cylinders to the required size referring to S.D.S.
6
Measure the finished cylinder bore for out-of-round and taper.
Do not cut too much out of the cylinder bore at a time. Cut only 0.05 mm (0.0020 in) or so in diameter at a time.
Bore the cylinders in the order of 2-4-1-3 to prevent heat strain due to cutting.

1
Measure piston skirt diameter "A" and cylinder bore diameter.
Piston diameter "A": Refer to S.D.S.
SEM126
2
Check that piston clearance is within the specification.

Specification	Value
Piston clearance(0.0009 - 0.0017 in)	0.023 - 0.043mm

Piston clearance(0.0009 - 0.0017 in)

0.023 - 0.043mm