70
Cylinder bore dia. limit
65.070 mm
(2.5618 in.)
Taper and out–of–round limit
0.10 mm
(0.0039 in.)
Piston and piston rings
Inspect the outer surface of each piston for evi-
dence of burn and for scratch or groove marks.
Minor flaws can be removed by sanding with fine
grain sandpaper.
De–carbon the piston crown and ring grooves,
using a soft metal scraping tool.
Piston Diameter:
Piston to cylinder clearance, mentioned above,
is equal to the bore diameter minus the piston
diameter, which is to be measured by measuring
at the level of the piston in the direction trans-
verse to piston pin axis, as shown if figure below.
This level (H) for the skirt end is 15.0 mm (0.59
in.) high.
Standard
64.965 – 64.985mm
2.5577 – 2.5584 in.)
Piston
Diameter
Oversize
0.25 mm
(0.0098 in.)
65.215 – 65.235 mm
(2.5676 – 2.5683 in.)
Oversize
0.50 mm
(0.0196 in.)
65.465 – 65.485 mm
(2.5774 – 2.5781 in.)
Ring clearance in the groove:
Using a thickness gauge, check each piston ring
in its groove for side clearance and if the limit
stated below is exceeded, measure the groove
width and ring width to determine whether the
piston or the ring or both have to be replaced.
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