ENGINE MECHANICAL (H27 ENGINE) 6A2-35
INSPECTION
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 specification :
3) Using micrometer, measure piston diameter.
4) Calculate cylinder bore diameter to be rebored as follows.
D = A + B – C
Cylinder bore diameter to be rebored
A : Piston diameter as measured
B : Piston clearance = 0.02 – 0.04 mm (0.0008 – 0.0015 in.)
C : Allowance for honing = 0.02 mm (0.0008 in.)
5) Rebore and hone cylinder to calculated dimension.
6) Measure piston clearance after honing.
Size Piston diameter
Standard 87.970 – 87.990 mm (3.4634 – 3.4642 in.)
Oversize 0.25 88.220 – 88.240 mm (3.4732 – 3.4740 in.)
Oversize 0.50 88.470 – 88.490 mm (3.4831 – 3.4839 in.)
NOTE:
Before reboring, install all main bearing caps in place
and tighten to specification to avoid distortion of bearing
bores.
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