Piston And Piston Rings; Operation 4-12 To Inspect - Perkins New 1000 Series Workshop Manual

4
New 1000 Series

Piston and piston rings

To inspect Operation 4-12
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 rings are not broken.
3 Remove the piston rings, see Operation 4-7, 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, refer to the Data and dimensions for
"Pistons and piston cooling jets" on page 18, and renew the piston, if necessary.
Note: The pistons have a tapered top groove and the piston ring is wedge shaped, refer to Operation 4-8 (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 removed from the oil control ring
when the gap of this piston ring is measured. For piston ring gaps on new components, refer to the Data and
dimensions for "Piston rings" on page 18.
A B
C049 A0088
88 Workshop Manual, TPD 1350E, Issue 4
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