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Figure 3C-21. Measuring Piston Compression Figure 3C-19. Measuring Piston Ring Gap diameter facing top of piston when installed. Slotted oil control ring is used in bottom ring groove.

Use a piston ring expander tool to slip compression rings over piston into their respective grooves as shown in Fig. 3C-23. Be extremely careful not to overexpand, twist rings or damage the finely finished piston surface when slipping them in place. The piston ring expander tool can also be used to good advantage when removing piston rings.

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