Heavy Duty Balanced Opposed Compressors

FOR MODELS: JG AND JGA SECTION 1 - DESIGN SPECIFICATIONS & DATA
Piston Ring and Packing Ring Side Clearance, Inches (mm)
The standard side clearance in inches (mm) for JG and JGA compressor piston rings and
packing rings when new are as follows:
TABLE 1-3: NEW CONVENTIONAL PISTON RING SIDE CLEARANCE, INCHES (mm)
NOMINAL
WIDTH
ACTUAL GROOVE
WIDTH
NON-METALLIC BRONZE
3/16 (4.76) 0.187 to 0.189 (4.75 to 4.80) 0.005 to 0.009 (0.13 to 0.23) 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 to 0.23) 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) 0.007 to 0.011 (0.18 to 0.28) 0.004 to 0.008 (0.10 to 0.20)
3/4 (19.05) 0.750 to 0.752 (19.05 to 19.10) 0.014 to 0.019 (0.36 to 0.48) 0.006 to 0.010 (0.15 to 0.25)
TABLE 1-4: NEW RIDER RING SIDE CLEARANCE, INCHES (mm)
NOMINAL WIDTH ACTUAL GROOVE WIDTH
3/16 (4.76) 0.187 to 0.189 (4.75 to 4.80)
1/4 (6.35) 0.250 to 0.252 (6.35 to 6.40)
3/8 (9.53) 0.375 to 0.377 (9.53 to 9.58)
1/2 (12.70) 0.500 to 0.502 (12.70 to 12.75)
TABLE 1-5: PACKING RING SIDE CLEARANCE, INCHES (mm)
ACTUAL
GROOVE
WIDTH
0.375 to 0.377
(9.53 to 9.58)
0.447 to 0.449
(11.35 to 11.41)
0.562 to 0.564
(14.28 to 14.33)
0.936 to 0.938
(23.77 to 23.82)
a. Side loaded “AL” (5) ring type
1 - RING/
GROOVE
NON-METAL OR
CI
0.011 to 0.014
(0.28 to 0.36)
2 - RINGS/
GROOVE
NON-METAL OR
CI
0.011 to 0.015
(0.28 to 0.38)
3 - RINGS/
GROOVE
NON-METAL &
CI
N/A N/A 0.013 to 0.018
(0.33 to 0.46)
N/A N/A 0.017 to 0.022
(0.43 to 0.56)
N/A Zero (0) a
BRONZE
N/A 0.006 to 0.008
(0.15 to 0.20)
11/01 PAGE 1 - 9
N/A