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6A1-82 ENGINE MECHANICAL (M13 ENGINE)
Cylinder Block
Distortion of gasketed surface
• Using straightedge and thickness gauge, check gasketed
surface for distortion and, if flatness exceeds its limit, correct
it.
Cylinder block flatness
Limit : 0.05 mm (0.0020 in.)
Honing or reboring cylinders
1) When any cylinder needs reboring, all other cylinders must
also be rebored at the same time.
2) Select oversized piston according to amount of cylinder
wear.
Oversize piston diameter
Size
Oversize 0.25
78.203 - 78.218 mm (3.0789 - 3.0794 in.)
Oversize 0.50
78.453 - 78.468 mm (3.0887 - 3.0893 in.)
3) Using micrometer, measure piston diameter.
Measurement position for piston diameter
"a" : 19.5 mm (0.77 in.)
4) Calculate cylinder bore diameter to be rebored as follows.
D = A + B – C
D : Cylinder bore diameter to be rebored.
A : Piston diameter as measured.
B : Piston clearance = 0.02 – 0.04 mm (0.0008 – 0.0016 in.)
C : Allowance for honing = 0.02 mm (0.0008 in.)
5) Rebore and hone cylinder to calculated dimension.
NOTE:
Before reboring, install all main bearing caps in place
and tighten to specification to avoid distortion of bearing
bores.
6) Measure piston clearance after honing
Piston diameter
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