Inspecting Pistons
| Piston diameter is indicated by size group stamped into the piston
top. The individual size groups are shown in the
[html:/912/manual22.html piston size table]. Piston measuring point is
shown in Fig. 137.
In order to obtain precise measurement values, we recommend the use of
a fixed dial gauge which has been preset with gauge blocks. Pistons
showing evidence of seizure or wear are no longer serviceable;
however, if the mating cylinder is in good condition, the fault can be
rectified by installing only a new piston of the appropriate size
group or letter designation.
|
Piston Measuring Points and Identification
Conspiculously broad bevel around the piston top perimeter.
Two compression rings above the piston pin, one oil scraper below the
piston pin.
Nominal diameter measuring point shown by arrow
[html:/912/912_fig_137 (Fig. 137)].
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