Piston And Piston Rings; To Inspect - Perkins 1000 Series Workshop Manual

13
PISTON AND CONNECTING ROD ASSEMBLIES

Piston and piston rings

To inspect

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,
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: Some pistons have a tapered top groove and
the piston ring is wedge shaped (13A.10 C/D);
when this occurs the top piston ring clearance
cannot be checked by this method.
5 Clean all carbon from the top of the cylinder
liners. Fit the piston rings 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.
13A.12
13A-06
operation 13A-04, and
Perkins Phaser/1000 Series, April 1995
PA087
PA088