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

4-25
FIGURE 4-21. SANDCAST CRANKCASE ASSEMBLY COMPLETE.
1. Rod Assembly, 20. Bolt 43. Washer, Plain 65. Bracket,
Oil Gauge 21. Eye, Engine Lifting 44. Washer, Plain Engine Mount
2. “O” ring 22. Spacer 45. Nut, Plain, Hex 66. Screw
3. Nut, No. 10-32 23. Valve Assembly 46. Washer, Lock 67. Clip, Oil Transfer
4. Washer, Lock 24. Bolt 47. Washer, Plain 68. "0" Rings
5. Washer, Plain 25. Washer, Lock 48. “O” ring 69. Nozzle, Squirt
6. Screw 26. Washer, Plain 49. Bolt 70. Ring, Retaining
7. Bracket 27. Nut, Plain, Hex 50. Bolt 71. Housing
8. Clamp 28. Washer, Plain 51. Nut, Plain, Hex 72. Bearing, Needle
9. Clamp, Hose, 29. Nut, Flanged 52. Washer, Lock 73. Plug, Machine Thread
Worm Type 30. Washer, Plain 53. Washer, Plain 74. Gasket, Copper
10. Housing 31. Bracket, Generator 54. Bolt, Thru 75. Insert, Thread
11. Hose 32. Nut, Plain, Hex 55. Bolt, Thru 76. Plug
12. Cap Assembly, 33. Washer, Lock 56. Bolt, Thru 77. Plug
Oil Filter 34. Washer, Plain 57. Bolt, Thru 78. Plug
13. Gasket 35. Washer 58. Nut, Plain, Hex 79. Breather
14. Screw 36. Cover, Gov. Pad 59. Washer, Lock 80. Screw, Drive
15. Neck Assembly, 37. Gasket 60. Pin, Idler 81. Plate, Identification
Oil Filler 38. Nut, Flanged Gear Support 82. Crankcase, 2-4-6 Side
16. Gasket 39. Spacer 61. Gasket 83. Crankcase, 1-3-5 Side
17. Nut, Plain, Hex 40. Nut, Plain 62. Nut, Plain, Hex
18. Washer, Lock 41. Washer, Plain 63. Washer, Lock
19. Washer, Plain 42. Bolt 64. Washer, Plain