Piston Rings

Installation

PROCEDURE

1. Check the ring end gap.

2. Lay out the pistons assembled with connecting rods and the new piston rings in an order such that the ring set corresponds to the cylinder in which the gap will be measured and into which the rings being checked will be installed.

3. Insert the top ring into the first cylinder and push it in with the piston crown so that the ring sits square to the cylinder axis. Push the ring to a depth where the lower edge of the piston skirt is level with the cylinder block mating surface, then remove the piston.

4. Measure the gap with a feeler gauge and compare the result with the specification.

5. If the gap is too small, carefully file the ring ends with a fine file.

6. If the gap is greater than specified, make sure the ring is correct for this engine and the cylinder bore size group.

7. Repeat the procedure for each ring of the first cylinder, and for the rings of the other cylinders. Keep rings and pistons belonging to the same cylinder together.

8. After selecting the rings, measuring and adjusting the gap, the rings can be installed on the pistons.

Warning Always follow the ring manufacturer's instructions, since different manufacturers recommend different ring installation procedures. Do not confuse the top and bottom compression rings, which have different profiles.

9. The oil control ring is installed first.

10. Install the expander into the groove.

11. Then, between the expander and the groove lands, install the upper and lower oil control ring rails in order.

12. Install the bottom compression ring.

13. Install the top compression ring, orienting it correctly. If the ring has a symmetrical cross-section, position it so that the identification mark faces up.

14. Align the ring end gaps as specified.

15. Install the rings on the remaining pistons.