Ariel JGI, Technical Manual

Page: 23 / 178

F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ S
ECTION
1 - D
ESIGN
S
PECIFICATIONS
& D
ATA
9/08 PAGE 1-13
T
ABLE
1-8 P
ISTON TO
B
ORE
C
LEARANCE AND
P
ISTON
/R
IDER
R
ING
E
ND
G
AP
, I
N
.
(mm) - M, P & SP C
LASS
C
YLINDERS
BORE
DIAMETER
a
PISTON TO BORE
CLEARANCE
PISTION/RIDER RING END GAP
NEW MAXIMUM
1.625 (41) 0.090 to 0.096 (2.29 to 2.44)
1.75 (44) 0.090 to 0.096 (2.29 to 2.44) 0.016 to 0.032 (0.41 to 0.81) 0.128 (3.25)
2.0625 (52) 0.090 to 0.096 (2.29 to 2.44) 0.020 to 0.036 (0.51 to 0.91) 0.144 (3.66)
2.25 (57) 0.090 to 0.096 (2.29 to 2.44)
2.5 (64) 0.090 to 0.096 (2.29 to 2.44) 0.044 to 0.060 (1.12 to 1.52) 0.240 (6.10)
2.75 (70) 0.090 to 0.096 (2.29 to 2.44) 0.044 to 0.060 (1.12 to 1.52) 0.240 (6.10)
3 (76) 0.090 to 0.096 (2.29 to 2.44) 0.044 to 0.060 (1.12 to 1.52) 0.240 (6.10)
3.25 (83) 0.090 to 0.096 (2.29 to 2.44) 0.044 to 0.060 (1.12 to 1.52) 0.240 (6.10)
3.5 (89) 0.090 to 0.096 (2.29 to 2.44) 0.044 to 0.060 (1.12 to 1.52 0.240 (6.10)
3.75 (95) 0.090 to 0.096 (2.29 to 2.44) 0.044 to 0.060 (1.12 to 1.52 0.240 (6.10)
3.875 (98) 0.090 to 0.096 (2.29 to 2.44) 0.045 to 0.061 (1.14 to 1.55) 0.244 (6.20)
4.125 (105) 0.090 to 0.096 (2.29 to 2.44) 0.049 to 0.065 (1.24 to 1.65) 0.260 (6.60)
4.375 (111) 0.090 to 0.096 (2.29 to 2.44) 0.052 to 0.068 (1.32 to 1.73) 0.272 (6.91)
4.75 (121) 0.090 to 0.096 (2.29 to 2.44) 0.057 to 0.073 (1.45 to 1.85) 0.292 (7.42)
5.125 (130) 0.090 to 0.096 (2.29 to 2.44) 0.062 to 0.078 (1.57 to 1.98) 0.312 (7.93)
5.5 (140) 0.090 to 0.096 (2.29 to 2.44) 0.068 to 0.084 (1.73 to 2.13) 0.336 (8.53)
5.75 (146) 0.090 to 0.096 (2.29 to 2.44) 0.071 to 0.087 (1.80 to 2.21) 0.348 (8.84)
6.125 (156) 0.090 to 0.096 (2.29 to 2.44) 0.069 to 0.099 (1.75 to 2.51) 0.396 (10.06)
6.5 (165) 0.090 to 0.096 (2.29 to 2.44) 0.074 to 0.104 (1.88 to 2.64) 0.416 (10.57)
7.5 (191) 0.090 to 0.096 (2.29 to 2.44)
footnote
b
footnote
2
8 (203) 0.090 to 0.096 (2.29 to 2.44)
footnote
2
footnote
2
8.5 (216) 0.090 to 0.096 (2.29 to 2.44) 0.114 to 0.144 (2.90 to 3.66) 0.576 (14.63)
8.875 (225) 0.090 to 0.096 (2.29 to 2.44) 0120 to 0.150 (3.05 to 3.81) 0.600 (15.24)
10.5 (267) 0.090 to 0.096 (2.29 to 2.44) 0.144 to 0.174 (3.66 to 4.42) 0.696 (17.68)
11 (279) 0.090 to 0.096 (2.29 to 2.44) 0.152 to 0.182 (3.86 to 4.62) 0.728 (18.49)
13 (330) 0.090 to 0.096 (2.29 to 2.44) 0.182 to 0.212 (4.62 to 5.39) 0.848 (21.54)
13.5 (343) 0.090 to 0.096 (2.29 to 2.44) 0.190 to 0.220 (4.83 to 5.59) 0.880 (22.35)
a. Conventional piston rings are standard for all M, P and SP Class Cylinders, except for 1-3/4M-FS with
bore diameters of 1.625” (41mm) and 1.75” (44) where piston/rider rings are standard. Piston/rider
rings are optional for all other M, P and SP Class Cylinders, except for 1-3/4SG-FS-HE which uses
conventional rings and wear band.
b. 8M x 3-1/2” (88.9 mm) stroke & 8SP-HE class cylinders, w/ 7.5” (191) bore: end gap, new is 0.099” to
0.129” (2.51 to 3.53), maximum is 0.516” (13.11). 8M x 3” (76.2) stroke, w/ 7.5” (191) bore: new
0.088” to 0.118” (2.24 to 3.00), maximum 0.472” (11.99). 8M x 3-1/2” (88.9) & 8SP-HE, w/ 8” (203)
bore: new 0.106” to 0.136” (2.69 to 3.43), maximum 0.544” (14.07). 8M x 3” (76.2) w/ 8” (203) bore:
new 0.095” to 0.125” (2.41 to 3.18), maximum 0.500” (12.70).