Heavy Duty Balanced Opposed Compressors

FOR MODELS: JG AND JGA SECTION 1 - DESIGN SPECIFICATIONS & DATA
TABLE 1-10: PISTON TO BORE CLEARANCE AND CONVENTIONAL PISTON RING END GAP, INCHES
(mm) - NON-LUBE JG CLASS CYLINDERS
BORE
DIAMETER
PISTON TO BORE
CLEARANCE
PISTON RING END GAP - NON-METALLIC
NEW MAXIMUM
3.375 (86) 0.075 to 0.083 (1.91 to 2.110 0.044 to 0.056 (1.12 to 1.42) 0.224 (5.68)
6.125 (156) 0.084 to 0.097 (2.13 to 2.46) 0.073 to 0.093 (1.85 to 2.36) 0.373 (9.44)
7.5 (191) 0.085 to 0.098 (2.16 to 2.49) 0.098 to 0.118 (2.49 to 3.00) 0.472 (12.00)
TABLE 1-11: WEAR BAND END GAP, RADIAL PROJECTION & SIDE CLEARANCE (NEW) - LUBRICATED
1-3/4JG-FS-HE & 7-1/2JG (WITH HEAVY PISTON) CLASS, INCHES (mm)
BORE
DIAMETER
END GAP
MINIMUM
a. Replace wear band before piston contacts the cylinder bore.
RADIAL PROJECTION a
SIDE CLEARANCE
1.25 (32) 0.039 (0.99) 0.005 to 0.012 (0.13 to 0.30) 0.010 to 0.014 (0.25 to 0.36)
1.5 (38) 0.049 (1.24) 0.0075 to 0.0145 (0.19 to
0.37)
0.010 to 0.014 (0.25 to 0.36)
1.625 (41) 0.052 (1.32) 0.0075 to 0.0135 (0.19 to
0.34)
0.010 to 0.014 (0.25 to 0.36)
1.75 (44) 0.058 (1.47) 0.0075 to 0.0145 (0.19 to
0.37)
0.010 to 0.014 (0.25 to 0.36)
7.5 (191) 0.210 (5.33) 0.028 to 0.039 (0.71 to 0.99) 0.011 to 0.016 (0.28 to 0.41)
TABLE 1-12: WEAR BAND END GAP, RADIAL PROJECTION & SIDE CLEARANCE (NEW) - NON-LUBE,
INCHES (mm)
BORE
DIAMETER
END GAP
MINIMUM
a. Replace wear band before piston contacts the cylinder bore.
RADIAL PROJECTION a
SIDE CLEARANCE
2.75 (70)) 0.088 (0.2.24)) 0.036 to 0.050 (0.91 to 1.27) 0.010 to 0.014 (0.25 to 0.36)
3.375 (86) 0.085 (2.16) 0.027 to 0.034 (0.69 to 0.86) 0.010 to 0.014 (0.25 to 0.36)
6.125 (156) 0.201 (5.11) 0.028 to 0.039 (0.71 to 0.99) 0.010 to 0.014 (0.25 to 0.36)
7.5 (191) 0.164 (4.17) 0.028 to 0.039 (0.71 to 0.99) 0.011 to 0.016 (0.28 to 0.41)
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