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
5-9
clean engine lubricating oil. The rear pad of the
adapter, rather than the studs, should be supported on
a parallel block and a flat block should be used to
exert pressure, unless the arbor has a perfect end.
Ream or bore the bushing to the specified diameter
then face the flange until it projects forward 1.454-
1.458 inch from the adapter parting surface. Chamfer
the bore at the flange end 1/16 inch deep on a 450
angle, and slightly break sharp edges at both ends.
The bushing hole must be concentric with the adapter
pilot shoulder within 0.002 inch and square with the
parting surface within 0.002 inch per inch of length.
Its flange thrust face must be parallel to the parting
surface within 0.002 inch (full indicator reading).
CAUTION
Before boring a new bushing, plug its oil
boles with beeswax to exclude cbips from
tbe adapter oil groove. Be sure to remove
the wax completely after the operation.
5-34. In most instances the old seal may be driven out
with a 1/8 inch diameter pin punch inserted through
the four oblique oil holes in the bushing boss
alternately. If the seal is too tight for that method,
drill and tap two opposite machine screw holes in the
exposed flange of the seal case to match two screw
clearance holes in a pressure plate which can be laid
on the adapter studs. Run nuts on two long machine
screws; then insert the screws through the pressure
plate holes, and screw them into the holes tapped in
the seal. To avoid unnecessary stoning of the seal
bore, tighten the nuts against the plate to pull the seal
squarely from its recess. Smooth any scores in the
vacant adapter counter bore. Coat the periphery of a
new oil seal with lubricating grease, and press it into
the adapter with an arbor press and a flat end block of
1-3/8 inch diameter by 1-1/4 inch length.
5-35. TACHOMETER DRIVE HOUSING.
Remove the oil seal with a suitable oil seal puller. If
the housing counterbore is scored, smooth it with
crocus cloth. Spread a film of Lubriplate grease on
the periphery of a new seal. Then press the seal
squarely into the housing with its lip pointed outward,
facing the oil source.