FOR MODELS: JGW, JGR AND JGJ SECTION 1 - DESIGN SPECIFICATIONS & DATA
1/01 PAGE 1 - 11
TABLE 1-7: PISTON TO BORE CLEARANCE AND CONVENTIONAL PISTON RING END GAP,
I
NCHES (mm) - W & R CLASS CYLINDERS
BORE
DIAMETER
PISTON TO BORE CLEARANCE
PISTON RING END GAP
a
a. A piston/rider ring is optional for all W and R Class cylinders and is standard for R Class cylinders
with diameters of 13.5 to 19.5 inches (343 to 495 mm).
NEW MAXIMUM
1.75 (44)
Uses Wearbands, see Table 1-9 on page 1-13 and Table 1-10 on page 1-14
2 (51)
3.625 (92) 0.010 to 0.015 (0.25 to 0.38) 0.044 to 0.068 (1.12 to 1.73) 0.204 (5.18)
3.875 (98) 0.010 to 0.015 (0.25 to 0.38) 0.046 to 0.070 (1.17 to 1.78) 0.210 (5.33)
4.125 (105) 0.010 to 0.015 (0.25 to 0.38) 0.049 to 0.073 (1.24 to 1.85) 0.219 (5.56)
4.25 (108) 0.010 to 0.015 (0.25 to 0.38) 0.051 to 0.075 (1.30 to 1.91) 0.225 (5.72)
4.625 (117) 0.012 to 0.017 (0.30 to 0.43) 0.056 to 0.080 (1.42 to 2.03) 0.240 (6.19)
4.75 (121) 0.012 to 0.018 (0.30 to 0.46) 0.057 to 0.081 (1.45 to 2.06) 0.243 (6.17)
5.125 (130) 0.012 to 0.017 (0.30 to 0.43) 0.061 to 0.085 (1.55 to 2.16) 0.255 (6.48)
5.5 (140) 0.013 to 0.018 (0.33 to 0.46) 0.066 to 0.090 (1.68 to 2.29) 0.270 (6.86)
6 (152) 0.013 to 0.018 (0.33 to 0.46) 0.072 to 0.112 (1.83 to 2.84) 0.336 (8.53)
6.375 (162) 0.014 to 0.019 (0.36 to 0.48) 0.077 to 0.117 (1.96 to 2.97) 0.351 (8.92)
7 (178) 0.015 to 0.020 (0.38 to 0.51) 0.084 to 0.124 (2.13 to 3.15) 0.372 (9.45)
7.125 (181) 0.015 to 0.021 (0.38 to 0.53) 0.085 to 0.125 (2.16 to 3.18) 0.375 (9.53)
7.375 (187) 0.015 to 0.020 (0.38 to 0.51) 0.089 to 0.129 (2.26 to 3.28) 0.387 (9.83)
7.5 (191) 0.015 to 0.021 (0.38 to 0.53) 0.089 to 0.129 (2.26 to 3.28) 0.387 (9.83)
8 (203) 0.016 to 0.022 (0.41 to 0.56) 0.096 to 0.136 (2.45 to 3.45) 0.408 (10.36)
8.375 (213) 0.017 to 0.023 (0.43 to 0.58) 0.101 to 0.141 (2.57 to 3.58) 0.423 (10.74)
8.5 (216) 0.017 to 0.023 (0.43 to 0.58) 0.102 to 0.142 (2.59 to 3.61) 0.426 (10.82)
8.875 (225) 0.018 to 0.023 (0.46 to 0.58) 0.107 to 0.147 (2.72 to 3.73) 0.441 (11.20)
9.25 (235) 0.019 to 0.025 (0.48 to 0.64) 0.111 to 0.151 (2.82 to 3.84) 0.453 (11.51)
9.75 (248) 0.020 to 0.026 (0.51 to 0.66) 0.117 to 0.157 (2.97 to 3.99) 0.471 (11.96)
10.375 (264) 0.022 to 0.026 (0.56 to 0.66) 0.124 to 0.164 (3.15 to 4.17) 0.492 (12.50)
11 (279) 0.022 to 0.028 (0.56 to 0.71) 0.131 to 0.179 (3.33 to 4.55) 0.537 (13.64)
11.5 (292) 0.023 to 0.029 (0.58 to 0.74) 0.138 to 0.186 (3.51 to 4.72) 0.558 (14.17)
13 (330) 0.026 to 0.032 (0.66 to 0.81) 0.156 to 0.204 (3.96 to 5.18) 0.612 (15.54)
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