Operating instructions

9-1
SECTION IX
IO-520-M
The IO-520-M is similar to the other Permold engines
covered in Sections I thru VIII except that the air
throttle body is air frame mounted.
The instructions contained in Sections I thru VIII
pertaining to the Permold engine design, together with
the parts catalog, will provide adequate instructions
for the overhaul of the IO-520-M engine.
Those systems which are unique to the IO-52D-M, the
Induction System and the Fuel Injection System are
covered on the following pages.
9-1. INDUCTION SYSTEM.(See Figure 9-1).
a. Loosen hose clamps (7) or clamp assemblies (8) on
hoses (9). Remove attaching parts (4,5,6) and remove
elbows (2,3 and 10).
FIGURE 9-1. INDUCTION SYSTEM
1. Gasket, Intake Manifold Flange 14. Bracket, Balance Tube
2. Tube Assembly, Intake Manifold, Cyl.1 ,2,3,4,5 15. Clamp, Balance Tube to Bracket
3. Tube Assembly, Intake Manifold, Cyl.6 16. Tube Assembly, Balance
4. Washer Plain 17. Washer
5. Washer, Lock 18. Bolt, 15/16-18 X 1-1/8 Inch Long
6. Screw, 1/4-20 x 7/8 Inch Long 19. Plug, Pipe
7. Clamp, Hose 20. Bracket, Crankcase-to-Riser
8. Clamp Assembly, Hose 21. Screw, 5/1&18 X 2.00 Inch Long
9. Hose, Intake Manifold 22. Spacer
10. Tube Elbow 23. Washer
11. Plug, Pipe 24. Nut
12. Riser 25. Flexible Duct
13. Stud, 1/4 X 1-1 13/32 Inch Long