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
6-20 JANUARY 1992
New Parts
Ref.
No.
Chart
No.
Model Description Serviceable
Limit
Min. Max.
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
1
1
1
1
1
2/3
**2/3
**2/3
2/3
2/3
2/3
2/3
2/3
2/3
2/3
2/3
2/3
2/3
2/3
2
3
2/3
2/3
2/3
2/3
2
3
2/3
2/3
1
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
P
All
S
P
All
All
All
All
All
S
P
All
All
All
Bushing in connecting rod. .................................... Diameter:
Bolt in connecting rod ............................................ Diameter:
Connecting rod bearing on crankpin
(tri-metal bearing) ............................................ Diameter:
Connecting rod on crankpin .........................End Clearance:
Connecting bearing and bushing............................................
.................... Twist or Convergence Per 1 inch of Length:
CRANKSHAFT
Crankshaft in main bearings (tri-metal). ................ Diameter:
Crankpins .......................................................Out-of-Round:
Main journals. .................................................Out-of-Round:
Crankshaft main and thrust journals (STD) ........... Diameter:
Crankshaft rear and intermediate bearing for "B" model
engines ............................................................ Diameter:
Crankpins .............................................................. Diameter:
Crankshaft run-out at center main journals
(shaft supported at thrust and rear journals)
......................................................Full Indicator Reading:
Crankshaft run-out at propeller flange (when
supported at front and rear main journals)
......................................................Full Indicator Reading:
Damper pin bushing in crankcheek extension ....... Diameter:
Damper pin bushing in counterweight. .................. Diameter:
Damper pin bushing bore in counterweight
and crankshaft hanger. ...................................... Diameter:
Damper pin (4thOrder) .......................................... Diameter:
Damper pin (5th Order) ......................................... Diameter:
Damper pin (6th Order) ......................................... Diameter:
Damper pin in counterweight. ......................End Clearance:
Crankcheek in counterweight. ..................... Side Clearance:
Alternator gear on crankshaft. ............................... Diameter:
Crankshaft gear on crankshaft. ............................. Diameter:
Crankshaft in thrust bearing. ........................End Clearance:
Crankshaft in thrust bearing. ........................End Clearance:
Oil transfer collar on crankshaft. ............................ Diameter:
CAMSHAFT
Camshaft journals in crankcase. ........................... Diameter:
Camshaft in crankcase. ................................End Clearance:
Camshaft run-out at center journals (shaft
supported at end journals) ...........Full Indicator Reading:
Camshaft gear on camshaft flange. ...................... Diameter:
Governor drive gear on camshaft. ......................... Diameter:
Governor drive gear on camshaft. ......................... Diameter:
CRANKCASE AND RELATED PARTS
Crankcase oil seal in crankcase (split seal) .......... Diameter:
Through bolt (10.75") in crankcase. ...................... Diameter:
Hydraulic tappet in crankcase. .............................. Diameter:
--
--
0.006 L
0.016
0.001
0.0050
0.0015
0.0015
2.372
2.623
2.247
0.015
0.005
--
--
0.6265
0.4735
0.5265
0.5549
0.040
0.017
--
--
0.022
0.020
0.005 L
0.014
0.001
--
0.006 L
0.006 L
--
--
0.0035L
0.0050T
0.0000
0.0009 L
0.006
0.0000
0.0005L
0.0000
0.0000
2.374
2.624
2.249
0.000
0.000
0.0015T
0.0015T
0.622
0.474
0.527
0.5554
0.001
0.005
0.0005 L
0.000
0.008
0.008
0.0005
0.001 L
0.005
0.000
0.0005T
0.0002 L
0.001 L
0.000 T
0.0005T
0.0015L
0.0025T
0.0018L
0.0034L
0.010
0.0005
0.0035L
0.0005
0.0005
2.375
2.625
2.250
0.015
0.005
0.0015T
0.0030T
0.626
0.475
0.528
0.5574
0.025
0.011
0.0035L
0.002
0.018
0.016
0.0018
0.003 L
0.009
0.001
0.0015L
0.0020L
0.003 L
0.004 T
0.0013L
0.0020L
** If crankshafts are worn beyond these limits they may be repaired by grinding crankpins and journals to
0.010” under new shaft limits and renitriding the crankshafts.
If these limits are exceeded, new bushings, pins and retaining plates must be installed to maintain proper
crankshaft dampening (paragraph 6-17).
P Permold Crankcase
S Sandcast Crankcase.