FOR MODELS: JGW, JGR AND JGJ SECTION 1 - DESIGN SPECIFICATIONS & DATA
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Piston Ring and Packing Ring Side Clearance, Inches (mm)
The standard side clearance in inches (mm) for JGW, JGR and JGJ compressor piston rings
and packing rings when new are as follows:
TABLE 1-4: NEW PISTON RING SIDE CLEARANCE, INCHES (mm)
NOMINAL WIDTH ACTUAL GROOVE WIDTH TEFLON ONE-PIECE BRONZE
3/16 (4.76) 0.187 to 0.189 (4.75 to 4.80) 0.0035 to 0.0075 (0.09 to 0.19) 0.004 to 0.008 (0.10 to 0.20)
1/4 (6.35) 0.250 to 0.252 (6.35 to 6.40) 0.005 to 0.009 (0.13 to0.23) 0.004 to 0.008 (0.10 to 0.20)
5/16 (7.94) 0.312 to 0.314 (7.92 to 7.98) 0.006 to 0.010 (0.15 to 0.25) 0.004 to 0.008 (0.10 to 0.20)
3/8 (9.53) 0.375 to 0.377 (9.53 to 9.58) 0.008 to 0.012 (0.20 to 0.30) 0.004 to 0.008 (0.10 to 0.20)
3/4 (19.05) 0.750 to 0.752 (19.05 to 19.10) 0.016 to 0.022 (0.41 to 0.56) 0.006 to 0.010 (0.15 to 0.25)
TABLE 1-5: RIDER RING SIDE CLEARANCE, INCHES (mm)
ACTUAL GROOVE WIDTH CLEARANCE
1.000 0.012 to 0.018 (0.30 to 0.46)
2.000 0.024 to 0.030 (0.61 to 0.76)
3.000 0.036 to 0.042 (0.91 to 1.07)
4.000 0.048 to 0.054 (1.22 to 1.37)
TABLE 1-6: PACKING RING SIDE CLEARANCE
RING TYPE OR
MATERIAL
SIDE CLEARANCE, INCHES (mm)
Bronze 0.006 to 0.008 (0.15 to 0.20)
Teflon One-Piece 0.010 to 0.012 (0.25 to 0.30)
P (PEEK) 0.010 to 0.015 (0.25 to 0.38)
BTR (TFE/CI) 0.012 to 0.018 (0.30 to 0.46)
AL (TFE) 0
BD (TFE) 0.010 to 0.015 (0.25 to 0.38)
3RWS (CI) 0.006 to 0.012 (0.15 to 0.30)
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