Standard Practices
Teledyne Continental Motors, Inc.
TM
C-6
IOF-550 Permold Series Engine Maintenance Manual
1 April 2007
At engine overhaul the starter, alternator, magnetos and engine fuel system must be
overhauled. On turbocharged engines, the turbocharger, waste gate, controller and
exhaust system must be overhauled. All engine baffles must be repaired or replaced and
all flexible baffle seals replaced.
Items such as spark plugs, alternator drive belts and air-conditioning drive belts are
replaced on condition.
C-2.5. Mandatory Overhaul Replacement Parts
In addition to the previously listed items, the following parts must be discarded and
replaced with new parts during engine overhaul.
•
All FADEC components forward of the
airframe firewall, including:
•
Electronic Control Units
•
Sensors
•
Engine Low Voltage Harness
•
Ignition Harness
•
Fuel Injectors
•
Hydraulic valve lifters (tappets)
•
Bearings: connecting rod, crankshaft main
and thrust, needle, ball, and roller
•
Bushings: rocker arm, connecting rod,
counter weight and crankshaft
counterweight blade
•
Counterweight pins, retaining plates and
snap rings
•
Connecting rod bolts and nuts
•
Connecting rod forging number 626119,
TCM P/N’s 646320 and 646321 with
beam width less than .625 inches.
Reference TCM CSB96-13.
•
Camshaft gear bolts
•
Crankshaft gear bolts
•
Crankshaft alternator face gear bolts and
lock plates
•
Replace intake valve rotocoils with solid valve
retainers part number 35971 on all E-series,
O-470, IO-470, IO-520 / 550, IOF-550, TSIO-
520 / 550, TSIOF-550, TSIOL-550 and
GTSIO-520 engines.
•
Intake and exhaust valve keepers
•
Inner and outer valve springs
•
Piston pins
•
Piston rings
•
Pistons
•
Rocker shafts
•
Rockers shaft thrust washers
•
Crankcase Through Bolts
•
Cylinder deck stud nuts and through bolt nuts
•
Exhaust valves
•
Exhaust valve rotocoils
•
Woodruff keys
•
Cold Start primer diverter valves
•
Fuel pump drive coupling P/N 631263 with P/N
653359 in accordance with TCM Mandatory
Service Bulletin MSB 95-6 or latest revision.
C-2.6. Authorized Oversize/Undersize Parts
Replacement authorized oversize (AO) or authorized undersize (AU) parts must be used
with the proper AO and AU mating parts. Example: Use 0.015 oversize piston and piston
rings with 0.015 oversize cylinder assembly.
C-3.
Torque
Torque hardware with calibrated torque wrenches according to the specifications in
Appendix B in this manual.
