Perkins New 1000 Series, Руководство по ремонту, Страница: 74 / 290

13
74 Workshop Manual, TPD 1350, issue 3
New 1000 Series
Piston and piston rings
To inspect 13-8
1 Check the piston for wear and other damage.
2 Check that the piston rings are free to move in their
grooves and that the the rings are not broken.
3 Remove the piston rings , see operation 13-5 , and
clean the piston ring grooves and the piston rings.
4 Fit new piston rings in the grooves and check for
wear of the grooves with feeler gauges (A). Compare
the piston ring clearance in the groove to that given
for new components in the data and dimensions and
renew the piston, if necessary.
Note: The pistons have a tapered top groove and the
piston ring is wedge shaped (
page 71 /B); the top
piston ring clearance cannot be checked by this
method.
5 Clean all carbon from the top of the cylinder liners.
Fit each piston ring in the top part of the cylinder liner
and measure the ring gap with feeler gauges (B). The
coil spring must be fitted to the oil control ring when
the gap of this piston ring is measured. The piston ring
gaps for new components are given in the data and
dimensions.
A
C049
B
A0088
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