The following two pages are excerpted from the Turbo-Flite 520/550 System Maintenance and Trouble shooting manual.



If the engine is to be removed, the turbocharger and its accessories should be removed in accordance with the following steps before removing engine mount bolts. All other procedures for engine removal listed in the Cessna 180/185 service manual apply.

a. Disconnect hoses to the intercooler.

b. Remove waste gate actuator in accordance with "Removal and Installation of Waste Gate Actuator" instructions.

c. Remove turbonormalizer in accordance with Turbonormalizer "Removal and Installation" instructions.

NOTE: If the engine is to be sent out for overhaul, be sure the overhauler knows that the engine has different fuel injection nozzles, a different engine-driven fuel pump, and a scavenge pump to accommodate the turbonormalizing system. The turbonormalizer, scavenge pump, fuel pump, waste gate, waste gate actuator, and absolute controller should be overhauled by approved facilities at the same time as the engine overhaul.


After overhaul and reinstallation of the engine note that fuel flows should be higher than those of the normally aspirated engine. Initial run-up should be done before cowling is installed to check for leaks. High power run-up should be done with the cowling installed. Verify oil temperature is in the normal operating range. Adjust waste gate controller as needed to produce 29.6 inches Hg manifold pressure at full throttle. Adjust fuel pump high speed adjustment as needed to produce a fuel flow of 30.5 1.5 gallons per hour for IO-520 or 33.5 1.5 gallons per hour for IO-550 at full throttle, with RPM set at 2700. Adjustment in the higher end of this range will provide for cooler cylinder head temperatures in the climb, but at a possible small decrease in performance.


Turbine housing bolts 160 - 190

Fuel injector nozzle 55 - 65

Fuel injector nozzle line nut 40 - 50

V-band clamps:

Compressor housing 40 - 60 net torque*

exhaust manifold 30 - 35 net torque*

tailpipe 40 - 60 net torque*

NOTE: After tightening V-band clamps, fly aircraft. Retorque after flight.

*Net torque = torque in addition to torque required to overcome resistance of locknut.


PERIODIC INSPECTION CHART (These procedures are in addition to periodic inspection procedures in Beech Bonanza Service Manual.)



Each 50 Hrs Each 100 Hrs Each 200 Hrs or 2 years whichever comes first Special Inspection Item
Cold & Hot Air Hoses X      
Engine Baffles X      
Intake & Exhaust Systems X     1
Cabin Heat Heat Exchanger     X  
Engine Shock Mounts   X    
Fuel Injection System X      
Turbocharger   X   3,4
All lines to turbocharger,

waste gate, & controller

  X   2
Waste Gate & Controller    




Turbocharger pressurized vent

lines to fuel pump & discharge nozzles

Turbocharger mounting


Heat Shields X      




1. General inspection every 50 hours. Refer to Engine Section of Beech Bonanza Service Manual for 100 hour inspection of exhaust system.

2. Replace hoses at engine overhaul or after 5 years, whichever comes first.

3. Overhaul at engine overhaul.

4.  Remove tailpipe and ducting, inspect turbine for coking, carbonization, oil deposits, and turbine impeller for damage. Inspect compressor wheel for damage, rubbing on housing, and free rotation