Color Code On Uflex Oil Ring

(Oposite ring gap) Std to .019 not marked .020 to .039 Light blue .040 to .059 Light green .060 to .079 Purple

Figure 3C-9. Assembling Rings with Ring Expander

To check compression ring gap, place a piston in cylinder with top end of piston about 1/2 in. from top of cylinder. Place ring In cylinder bore squarely against piston and check gap with thickness gauge (see Fig. 3C-7).

Use only standard size rings and piston in standard bore, and only matching oversize rings and piston in the same oversize bore. However, .005 in. oversize rings may be used on standard piston in standard bore if ring gap with standard ring exceeds .020 in. maximum.

Figure 3C-10. Replacing Rod Bushing

If gap is less than .010 in., ring ends may butt under expansion, and be scored or broken. Compression ring gap may be increased by filing with fine-cut file.

Use a commercially available piston ring expander (Fig. 3C-9) to guide and slip rings over the piston into their respective grooves without over expanding or twisting rings and damaging the finely finished piston»surface.

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