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
8-6
FIGURE 8-8 TORQUING SEQUENCE
a. Nuts on both ends of thru bolts must torqued. b. All stud and thru bolt threads to be lubricated with
castor oil.
ASSEMBLY PROCEDURE.
1. Insert thru bolts.
2. Snug bolts No. 27,28,54& 56.
3. Install cylinders 4 & 5 and Tighten stud nuts
to 350 in. lbs.
4. Tighten thru bolts No. 1 & 4 to 350 in. lbs. in
sequence shown.
5. Tighten thru bolts and stud nuts to 500 in. lbs.
6. Tighten thru bolts No. 1 & 2 in accordance with
note below. Tighten bolt No. 9 to 200 in. lbs.
7. Repeat above on cylinders No. 2 & 3.
8. Repeat above on cylinder No. 6, including bolts
No. 18 & 27 in sequence shown.
9. Repeat above on cylinder No. 1
10. Tighten bolts No. 38 thru 64 to specified torque in
sequence shown.
11. NOTE: Both sides of crankcase to be cross
torqued simultaneously.
NOTE- Reference .50 thru bolts, item 6 above.
1. If Part Number 634504 and 634505 bolts and nuts
are used, use 700 in. lbs. of torque.
2. If Part Number 539050 and 539969 bolts and nuts
are used, use 650 in. lbs. of torque.