Ring(S), Piston: Installation

If required, fit new rings to the piston. Refer to RING(S), PISTON, STANDARD PROCEDURE .

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NOTE:
The No. 1 (upper) piston ring (1) and No. 2 (intermediate) piston ring (2) have the same cross section thickness. Upon close inspection, they can be identified by their configuration. The No. 2 (intermediate) piston ring (2) is a micro napier design (hook edge) while the No. 1 (upper) piston ring (1) has a square edge.
CAUTION:
To avoid damage to the piston rings, they must be installed in the following order:
- Oil control ring expander (4)
- Oil control ring (3)
- No. 2 (intermediate) piston ring (2)
- No. 1 (upper) piston ring (1)
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NOTE:
Typical piston shown. Do not use a piston ring expander to install the oil control ring (1).
Install the oil control ring expander.
Install the oil control ring (1) over the ring expander.

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NOTE:
Install the rings with manufacturers I.D. mark (TOP) (2) facing up, towards the top of the piston. The No. 2 (intermediate) piston ring (3) is a micro napier design (hook edge) while the No. 1 (upper) piston ring (1) has a square edge.

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NOTE:
Typical piston shown.
Install the No. 2 (intermediate) piston ring using a ring expander tool.
Install the No. 1 (upper) piston ring using a ring expander tool.
Rotate the rings around the piston, the rings must rotate in the grooves without binding.

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Position the piston ring end gaps as follows:
- Oil control ring expander gap (5)
- Oil control ring end gap (2)
- No. 2 (intermediate) ring end gap (4)
- No. 1 (upper) ring end gap (1)
Install the piston and connecting rod(s). Refer to ROD, PISTON AND CONNECTING, INSTALLATION .