Torque Specifications
Teledyne Continental Motors, Inc.
TM
B-10
IOF-550 Permold Series Engine Maintenance Manual
1 April 2007
Table B-4.
Component Specific Torque Specifications
Torque Value
SIZE
FASTENER
IN./LB.
FT/LB.
MODELS AFFECTED
.62-18
Plug-Oil suction tube (using
crush washer)
190-210
15.8-17.5
All models, as required.
.62-18
Plug-Oil sump drain
190-210
15.8-17.5
All models as required
.62-18
Oil filter-Cartridge
180-216
15.0-18.0
All models as required
.75-16
Oil filter-Disposable type.
192-216
16.0-18.0
All models as required
.88-16
Plug-Oil bypass.
240-260
20.0-21.7
O-470, IO-470, TSIO-470, IO-520,
TSIO-520, GTSIO-520 IO-550, IOF-
550, TSIO-550, TSIOL-550, TSIOF-
550
1.00-14 Vernatherm-(Oil
temperature control valve)
440-460
36.7-38.3
All models, as required.
1.12-18 Housing-Oil
pressure
relief
valve
240-260
20.0-21.7
IO-346, O-470, IO-470, TSIO-470, IO-
520, TSIO-52O,GTSIO-520, IO-550,
IOF-550, TSIO-550 TSIOL–550,
TSIOF-550
1.375-16
LH Thd.
Housing tach drive
250-350
20.8-29.2
All models as required
1.25-18
Plug – Special (Vernatherm) 310-320
25.8-26.7
All models as required
1.25-18
Vernatherm.
410-420
34.2-35.0
All models as required
1.75-16
Oil filter screen using new
crush gasket ( install gasket
with parting line up against
screen face)
500-520
41.6-43.3
All models as required
Miscellaneous Crankcase Hardware
.125-27
Connector – Cylinder Drain
60-80
5.0-6.7
All Models (AR)
.25-20
Screw-Rocker box cover..
55-65
4.6-5.4
All models, as required
.25-20
Screw-Intake flange.
85-110
7.1-9.2
All models, as required.
.25-28 Nut-Exhaust
manifold
flange. (Spirotallic gasket)
100-110
8.3-9.2
All models, as required.
.31-24
Bolt-Rocker shaft hold down
NOTE
~
85-110
7.1-9.2
O-470, IO-470 TSIO-470, IO-520, IO-
550, IOF-550 (except G, N, P, R),
TSIO-520 (except BE), TSIOL-550,
TSIOF-550
.31-24
Nut-Exhaust manifold flange
(Spirotallic gasket)
200-210
16.7-17.5
All models as required
18 MM
Spark plug NOTE
300-360
25.0-30.0
All
models
.31-18 Bolt-Alternator
mounting 150-180
12.5-15.0
IO-346, GIO-470, All 520's (AR), All
550's(AR).
.38-24
Nut-Starter to adapter
200-220
16.7-18.3
O-300 (AR), GO-300 (AR), IO-346, All
470’s, All 520’s All 550’s
.56-18
Nut-Generator pulley drive
450-500
37.5-41.7
IO-346, All 470’s , IO-520, TSIO-520,
IO-550, IOF-550, TSIOL-550 TSIO-
550, TSIOF-550
.62-32
Nut-Alternator hub
assembly.
300-450
25.0-37.5
IO-346, GIO-470, IO-520(AR) TSIO-
520(AR), IO-550, IOF-550, GTSIO-520
(AR), TSIOL-550, TSIO-550, TSIOF-
550