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
6-12
SUBASSEMBLY
AND PART
INSPECT NATURE OF INSPECTION
SPECIAL
CONSIDERATIONS
Plugs Threads Look for distortion.
Wrench Flats Look for damaged corners.
Oil Temperature
Control Valve
Bore Inside diameter, scoring. Sandcast crankcase only.
Seat Roughness. Sandcast crankcase only.
OIL COOLER
ASSEMBLY
Oil Cooler Headers, Fins
Core
Inspect visually for dents,
deformed fins, punctures,
stripped plug hole threads,
cracks and scratches.
Machined Surfaces Warpage and scratches.
All areas Cracks
Oil Temperature
Control Valve Seat Roughness Permold Crankcase only.
OIL SUMP
ASSEMBLY
Casting Tapped Holes Damaged threads, cracks
around holes.
Mounting Surfaces Scratches, warpage, cracks.
All Areas Cracks.
Plugs Threads Look for distortion
Wrench Flats Look for damaged corners.
Oil Suction Tube Threads, Tube
Filter
Damaged threads, dented
tube, cracks in tube, distorted
or plugged filter.
Engine Mounting
Brackets
Machined Surfaces Scratches, cracks.
OIL PUMP
ASSEMBLY
Housing All Areas Cracks, scratches on
machined surfaces,
restrictions in oil holes.
Gearshaft Look for scoring, measure
diameter.
Gears must turn freely.
(Refer to Table of Limits.)
Plugs Distorted threads, damaged
wrenching surfaces.