Operating instructions
Table Of Contents
- 1 Introduction
- 2 General Description
- 3 Special Tools and Equipment
- 4 Disassembly
- 5 Cleaning, Repair and Replacement
- 6 Inspection
- Definitions
- Magnetic Particle Inspection
- Critical New Part Dimensions
- Fluorescent Particle Inspection
- Dimensional Inspection
- Protective Coatings
- Crankcase Inspection
- Crankshaft Inspection
- Camshaft Inspection
- Connecting Rod Inspection
- Gear Inspection
- Piston Inspection
- Cylinder Inspection
- Inspection Chart
- Crankcase Stud Heights
- Mag Particle Inspection Procedures
- Table of Limits
- Torque Specifications
- General Torques
- Table of Limits Chart
- 7 Assembly of Subassemblies
- 8 Final Assembly and Test
- 9 IO-520-M
- 10 IO-520-BB, CB and MB

6-25
TABLE XIV
GENERAL USE – TIGHTENING TORQUES
BOLTS, NUTS & SCREWS DRIVING STUDS
SIZE IN. LBS. FT. LBS. IN. LBS. FT. LBS.
8-32
10-32
¼-20
¼-28
5/16-18
5/16-24
3/8-16
3/8-24
7/16-14
7/16-20
½-20
17.5-22.5
36.0-50.0
75.0-85.0
90.0-110.0
155-175
180-220
220-260
275-325
400-450
550-600
1.5-1.9
3.0-4.2
6.3-7.1
7.5-9.1
13.0-14.6
15.0-18.4
18.3-21.7
22.9-27.1
33.3-37.5
45.8-50.0
50.0-70.0
100-150
200-174
300-424
4.2-5.8
8.3-12.5
16.6-22.8
25.0-35.4
TABLE XV
PIPE PLUGS
SIZE IN. LBS. FT. LBS.
1/8-27
¼-18
3/8-18
½-14
¾-14
60-80
130-150
185-215
255-285
310-350
5.0-6.6
10.9-12.5
15.4-18.0
21.2-23.8
25.8-29.2
NOTE
Torque loads listed are for use with oil on threads. If
cotter pin holes must be aligned, set torque wrench at
low limit and tighten nut to first hole beyond this torque,
except for connecting rods. Stud driving torques apply
when studs are coated with lubricant or sealer.