FOR MODELS: JGI, JGM, JGN, JGP AND JGQ SECTION 1 - DESIGN SPECIFICATIONS & DATA
PAGE 1-16 9/08
required, use very sparingly as excessive amounts will result in oil analysis indication con-
tamination and unnecessarily increase maintenance costs.
For latest available torque values, see ER-63 at www.arielcorp.com.
TABLE 1-12 FASTENER TIGHTENING VALUES
FASTENER
NOMINAL
SIZE,
INCH - TPI
TYPE
TORQUE,
LB-FT (N·m)
Main Bearing Cap - Cap Screw 1/2 - 13 12 Point - Grade 8 58 (79)
JGI Bearing Carrier to Frame - Cap
Screw
1/2 - 13 12 Point - Grade 8 44 (60)
Connecting Rod Cap - Cap Screw 1/2 - 13 12 Point - Grade 8/
Socket Head
58 (79)
1/2 - 20 67 (91)
Crosshead Pin Through Bolt 3/8 - 24 Hex - Lock Nut 25 (34)
Frame to Cylinder - Cap Screw 1/2 - 13 12 Point - Grade 8 48 (65)
Crosshead Guide to Support - Cap
Screw
5/8 - 11 Hex - Grade 8 or 9 90 (120)
Eccentric Vernier Cap - Cap Screw 5/16 - 18 Hex - Grade 8 Hand-wrench Tight
Idler Sprocket Through Bolt -
Lock Nut
1/2 - 20 Hex - Lock Nut 41 (55)
Rod Packing - Cap Screw 1/2 - 13 12 Point - Grade 8 35 (48)
Piston Nut
a
7/8 - 12 Ariel Design 222 (300)
Crosshead-Balance Nut 1 - 12 Ariel Design
Slugged
b
Piston Rod Oil Slinger - Lock Nut 1/4 - 28 lock Nut 96 lb-in. (11)
Rupture Disk - Blow-Out Fitting Cap 1/4 Nom. Tube Hex - Tube Fitting 40 lb-in. (4.4)
Hold Down - Stud-Nut 5/8 - 11 Hex Stud-Nut
100
c
(130)
3/4 - 10
175
3
(235)
Valve Cap;
Cylinder Head;
Gas Passage Cap;
Unloader;
Ariel Supplied Companion Flanges
- Cap Screw
3/8 - 16 Hex - Grade 8 or 9
or
12Point - Grade
B7M or 8
193 lb-in. (22)
7/16 - 14 26 (35)
1/2 - 13 40 (54)
9/16 - 12 57 (77)
5/8 -11 79 (105)
5/8 - 18 92 (125)
3/4 - 10 140 (190)
3/4 - 16 160 (215)
7/8 - 9 230 (310)
7/8 -14 260 (350)
1 - 8 345 (465)
1 - 16 395 (535)