Cylinder Block - Inspection (Cont'd)

EM-58prose procedure

Inspection (Cont'd)

3
Measure piston skirt diameter.
SEM658D
4
Check that piston-to-bore clearance is within specification.
5
Determine piston oversize according to amount of cylinder wear.
Oversize pistons are available for service. Refer to S.D.S.
6
Cylinder bore size is determined by adding piston-to-bore clearance to piston diameter "A".
Rebored size calculation: D = A + B - C, where, D: Bored diameter, A: Piston diameter as measured, B: Piston-to-bore clearance, C: Honing allowance 0.02 mm (0.0008 in)
7
Install main bearing caps, and tighten to the specified torque to prevent distortion of cylinder bores in final assembly.
8
Cut cylinder bores.
When any cylinder needs boring, all other cylinders must also be bored.
Do not cut too much out of cylinder bore at a time. Cut only 0.05 mm (0.0020 in) or so in diameter at a time.
9
Hone cylinders to obtain specified piston-to-bore clearance.
10
Measure finished cylinder bore for out-of-round and taper.
Measurement should be done after cylinder bore cools down.

Specification	Value
Piston diameter "A"	Refer to S.D.S.
Measuring point "a" (Distance from the bottom)(0.374 in)	9.5mm
Piston-to-bore clearance "B"(0.0006 - 0.0014 in)	0.015 - 0.035mm

Piston diameter "A"

Refer to S.D.S.

Measuring point "a" (Distance from the bottom)(0.374 in)

9.5mm

Piston-to-bore clearance "B"(0.0006 - 0.0014 in)

0.015 - 0.035mm

Specification	Value
Out-of-round (X - Y)(0.0002 in)	Less than 0.005mm
Taper (A - B)(0.0001 in)	Less than 0.002mm

Out-of-round (X - Y)(0.0002 in)

Less than 0.005mm

Taper (A - B)(0.0001 in)

Less than 0.002mm