POWER PLANT 1. GENERAL This chapter describes maintenance practices for the airplane systems which provide the means to induce and convert fuel-air mixture into power such as the engine, baffling, cowling, mount, attach fittings, electrical harnesses, air intake, and engine drains. 2. DESCRIPTION A. Engine The airplane is powered by a Teledyne Continental IO-360-ES engine. The engine is a six cylinder, horizontally opposed, fuel injected, air-cooled, wet sump, power plant incorporating a down01 May 2012 induction system, tuned exhaust, and provisions for front and rear mounted accessories. (See Figure 1) (See Figure 2) (See Figure 3) B. Baffling Sheet metal baffles are installed on the engine to direct the air flow around the cylinders and other engine compartment components. To help direct and contain air flow in the engine compartment, the baffles utilize fiber reinforced silicon seals in contact with the cowling around the circumference of the engine. Page 1 01 Jan 2012
3. TROUBLESHOOTING TROUBLE PROBABLE CAUSE REMEDY Engine will not start. Improper use of starting procedure. Review starting procedure. See POH. Fuel tank empty. Inspect and fill tank. (Refer to 12-10) Mixture control in SHUTOFF position. Advance mixture control to RICH position. Engine will not run at idle RPM. Fuel selector valve in OFF position. Fuel vaporization. Engine flooded. Water in fuel system. Fuel contamination. Defective magneto switch or grounded magneto leads. Spark plugs fouled. Excessive starter slippage. Defective ignition system. Induction system leak. Fuel system malfunction. Fuel injection system improperly adjusted. Air leak in intake manifold. Place selector valve in ON position to tank known to contain fuel. Turn boost pump ON. Turn off boost pump and ignition switch. Advance throttle to full OPEN, retard fuel control to full LEAN, and crank engine to clear cylinders of excess fuel. Repeat starting procedure. Sample fuel. See POH. If water present, drain and flush fuel system. (Refer to 12-10) Drain and flush fuel system. (Refer to 12-10) Check continuity. Repair or replace switch or leads. Remove, clean, and re-gap. Refer to the engine manufacturer's approved service instructions. Replace starter adapter. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Inspect and replace necessary components. (Refer to 74-00) Inspect hose for cracks. Tighten or replace loose or damaged hose connections. Isolate cause and correct. See Engine Fuel System Troubleshooting. (Refer to 73-00) Torque loose connection or replace malfunctioning part. Page 2
TROUBLE PROBABLE CAUSE REMEDY Rough idling. Engine runs too lean at cruising power. Fuel injection system improperly adjusted. Mixture levers set for improper mixture. Fouled Spark Plugs. Hydraulic tappets fouled. Burned or warped exhaust valves worn seat, scored valve guides. Manifold valve vent obstruction. Fuel flow reading too low. Fuel injection malfunction. Cracked induction tube. Improper manual leaning procedure. Adjust fuel system. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Review mixture control. See POH. Remove, clean and adjust gaps. (Refer to 74-20) Replace fouled tappets. Inspect and clean oil filter at more frequent intervals. Inspect, repair or replace cylinder. Replace any burned, warped or worn exhaust valves. Repair or replace manifold valve. Check fuel strainer for clogging. Clean screen. Inspect and replace necessary components. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Inspect, repair, or replace induction tube. Review leaning procedure. See POH. Fuel injection system maladjusted. Adjust fuel system. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Engine runs too rich at cruising power. Restrictions in air intake passages. Improper manual leaning of Fuel/ Air mixture. Cracked induction tube. Check passages and remove restrictions. Review leaning procedure. See POH. Inspect, repair, or replace induction tube. Engine runs too lean or too rich at throttle setting other than cruise. Fuel injection system maladjusted. See Engine Fuel System Troubleshooting. (Refer to 73-00) Continuous fouling of spark plugs. Piston rings excessively worn or broken. Piston rings are not seated. Replace rings. Replace cylinder if damaged. Hone cylinder walls and replace rings. Running the engine too rich. Review engine operation. See POH. Page 3
TROUBLE PROBABLE CAUSE REMEDY Engine runs rough at high RPM. Loose mounting bolts or damaged mount pads. Plugged fuel nozzle jet. Torque mounting bolts. Replace mount pads. (Refer to 71-20) Inspect and clean as necessary. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Propeller out of balance. Perform Adjustment/Test - Dynamic Balance. (Refer to 61-10) Ignition system malfunction. See Ignition Troubleshooting. (Refer to 74-00) Continuous missing at high RPM. Broken valve spring. Replace as necessary. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Plugged fuel nozzle jet. Burned or warped valve. Hydraulic tappet dirty or worn. Ignition system malfunction. Inspect and clean as necessary. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Repair or replace cylinder. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Remove and replace. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Inspect and replace necessary components. (Refer to 74-00) Sluggish operation and low power. Restriction in air intake passages. Inspect and clear obstruction. Ignition system malfunction. Inspect and replace necessary components. (Refer to 74-00) Fuel injection system maladjusted. Inspect and replace necessary components. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Valve seats worn and leaking. Piston rings worn or stuck in grooves. compression. Refer to the manu- Borescope cylinders and check facturer s approved Instructions For Continued Airworthiness. Throttle not full open. Check and adjust linkage. (Refer to 76-10) Page 4
TROUBLE PROBABLE CAUSE REMEDY High cylinder head temperature. Low octane fuel. Drain tanks and replace with correct fuel grade. (Refer to 12-10) Cylinder baffle seals leaking or mis-positioned. Debris between cylinder fins. Excessive carbon deposits in cylinder head and on pistons. Magnetos out of time. Inspect and repair cylinder baffles. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Thoroughly inspect and clean cylinder fins. Inspect ignition and fuel injections system. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Re-time ignition system internally and externally. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Magneto distributor block contamination. Replace magneto. (Refer to 74-10) Oil leaks. Exhaust system gas leakage. Exhaust valve leaking. Lean fuel/air mixture. At front of engine, damaged crankshaft oil seal. Around plugs, fittings, and gaskets due to looseness or damage. Inspect and repair. (Refer to 78-20) Inspect and repair cylinder. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Review leaning procedure. See POH. Replace crankshaft oil seal. Torque or replace. Low compression. Piston rings excessively worn. Inspect, repair or replace cylinder. Replace piston rings. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Valve faces and seats worn. Excessively worn cylinder walls. Inspect, repair or replace cylinder. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Replace cylinder and piston rings. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Page 5
TROUBLE PROBABLE CAUSE REMEDY Poor idle cut-off. Climbing to altitude, fuel flow fluctuates. Worn or improperly rigged mixture control. Engine driven fuel pump improperly adjusted. Fuel manifold valve not seated tightly. Fuel vaporization. Inspect cable. Replace worn linkage (if necessary). Rig properly. (Refer to 76-10) Adjust fuel pump. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Replace manifold valve. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Operate fuel boost pump. See POH. Low fuel pressure. Incorrect fuel pump adjustment. Check and adjust fuel pump. Refer to the manufacturer s approved Instructions For Continued Airworthiness. High fuel pressure. Malfunctioning fuel pump relief valve. Obstruction in fuel line. Malfunctioning relief valve operation in fuel pump. Restricted recirculation passage in fuel pump. Incorrect fuel pump adjustment. Replace fuel pump. Clear obstruction or replace fuel line. Replace fuel pump. Replace fuel pump. Check and adjust fuel pump. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Page 6
TROUBLE PROBABLE CAUSE REMEDY Fluctuating fuel pressure. Vapor in fuel system, excessive fuel temperature. Normally, operating the auxiliary pump will clear system. Operate boost pump. See POH. Engine has poor acceleration. Idle mixture too lean. Check RPM rise and idle cutoff. Adjust idle mixture. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Worn control linkage. Replace worn elements of linkage. (Refer to 76-10) Restricted air cleaner. Service air filter. (Refer to 71-60) Engine runs rough at above idle RPM. Malfunctioning ignition system. Improper Fuel/Air mixture. Restricted fuel nozzle jet. Ignition system and spark plugs malfunctioning. Check ignition cables and connections. Replace malfunctioning spark plugs. (Refer to 74-00) Check fuel manifold connections for leaks. Torque loose connections. Check fuel control/metering unit and linkage for setting and adjustment. Refer to the engine manufacturer's approved service instructions. Check fuel filters and screens for debris. Check for proper fuel pump pressure. Clean. Replace nozzle if obstruction cannot be cleared by solvent action. Clean, regap and test spark plugs. Inspect, test and repair ignition system. Replace components as required. (Refer to 74-00) Engine lacks power, reduction in maximum manifold pressure. Incorrectly adjusted throttle control linkage. Check movement of linkage by moving control from idle to full throttle. Replace worn components. (Refer to 76-10) Dirty air filter. Fuel manifold valve sticking or obstructed. Service air filter in accordance with the manufacturer s approved Instructions For Continued Airworthiness. (Refer to 71-60) Replace manifold valve. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Page 7
TROUBLE PROBABLE CAUSE REMEDY Low oil pressure indication on engine gage. Low oil supply. Oil viscosity too low. Malfunctioning oil pump. Weak or broken oil pressure relief valve spring. Replenish. Drain and refill with correct viscosity. Adjust oil pressure in accordance with the manufacturer s approved Instructions For Continued Airworthiness. Repair or replace oil pump. Replace spring. High oil temperature indication. Prolonged ground operation. Limit ground operation to a minimum. Engine starts but dies or will not idle. Malfunctioning gage or bulb unit. Climb angle too high. Obstruction on oil cooler. Insufficient baffle sealing in area of oil cooler. Low oil supply. Idle fuel adjustment screw incorrectly adjusted. Spark plugs fouled. Water in fuel system. Defective ignition system. Fuel system defective or contaminated. Fuel vaporization. Air leak in intake manifold. Inspect wiring, bulb unit, and gage. Reduce climb angle. Inspect for obstruction and remove. Inspect, repair, or replace engine baffling. Replenish. Adjust screw. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Remove, clean, and re-gap. (Refer to 74-20) Sample fuel. See POH. If water present drain and flush fuel system. (Refer to 12-10) Inspect and replace necessary components. (Refer to 74-00) Inspect, drain and flush fuel system. (Refer to 12-10) Operate boost pump. See POH. Tighten loose connection or replace malfunctioning part. Page 8
2 3 4 5 6 1 7 8 9 10 11 12 13 14 15 LEGEND 1. Alternator Sheave 2. Throttle Body 3. Throttle Control Cable 4. Vacuum Pump 5. Battery 6. Master Control Unit 7. Governor 8. Exhaust Gas Temperature Probe 9. Valve Cover 10. Lower Spark Plug 11. Oil Pressure Sensor 12. Cylinder Head Temperature Sensor 13. Governor Control Cable 14. Crankcase Oil Drain 15. Exhaust Collector 16. External Power Receptacle 17. Tailpipe 16 17 Serials 1005 thru 1267 Serials 1005 thru 1267. Figure 1 Engine Components - Serials 1005 thru 1267 (Sheet 1 of 4) SR20_MM71_1096 Page 9
18 19 20 21 22 23 26 24 25 23 LEGEND 18. Oil Separator 19. Left Magneto 20. Tachometer Sensor Assembly 21. Right Magneto 22. Starter 23. Engine Mount Isolator 24. Engine Mount Weldment 25. Oil Filter 26. Auxiliary Alternator (if installed) AFT VIEW Serials 1005 thru 1267. SR20_MM71_1097 Page 10 Figure 1 Engine Components - Serials 1005 thru 1267 (Sheet 2 of 4) Serials 1005 thru 1267
27 28 29 30 34 31 33 32 LEGEND 27. Engine Baffle 28. Alternator 29. Oil Separator Line 30. Propeller Mount 31. Heater Muffler 32. Oil Separator Vent Line 33. Muffler 34. Backup Vacuum Pump FRONT VIEW Serials 1005 thru 1267. SR20_MM71_1098 Serials 1005 thru 1267 Figure 1 Engine Components - Serials 1005 thru 1267 (Sheet 3 of 4) Page 11
35 36 37 38 39 40 41 42 50 LEGEND 35. Vacuum Manifold 44. Fuel Boost Pump 36. Induction Duct Assembly 45. Induction Air Filter 37. Alternate Air Duct 46. Manifold Air Pressure Sensor 38. Oil Cooler 47. Fuel Line 39. Oil Filler Port 48. Upper Spark Plug 40. Dipstick 49. Fuel Pump 41. Wiring Harness 50. Fuel Manifold Valve 42. Intake Manifold 43. Plenum Chamber Serials 1005 thru 1267. SR20_MM71_1099 Page 12 43 44 45 46 47 48 49 Figure 1 Engine Components - Serials 1005 thru 1267 (Sheet 4 of 4) Serials 1005 thru 1267
2 3 4 5 1 6 7 8 9 10 11 12 13 14 LEGEND 1. Alternator Sheave 2. Throttle Body 3. Throttle Control Cable 4. Alternator 5. Battery 6. Governor 7. Exhaust Gas Temperature Probe 8. Valve Cover 9. Lower Spark Plug 10. Oil Pressure Sensor 11. Cylinder Head Temperature Sensor 12. Governor Control Cable 13. Crankcase Oil Drain 14. Exhaust Collector 15. External Power Receptacle 16. Master Control Unit 17. Tailpipe Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics 15 16 17 SR20_MM71_1582A Figure 2 Engine Components - Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics (Sheet 1 of 4) Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics Page 13
18 19 20 21 22 23 24 25 23 AFT VIEW LEGEND 18. Oil Separator 19. Left Magneto 20. Tachometer Sensor Assembly 21. Right Magneto 22. Starter 23. Engine Mount Isolator 24. Engine Mount Weldment 25. Oil Filter Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics SR20_MM71_1583A Figure 2 Engine Components - Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics (Sheet 2 of 4) Page 14 Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics
26 27 28 29 30 32 31 LEGEND 26. Engine Baffle 27. Alternator 28. Oil Separator Line 29. Propeller Mount 30. Heater Muffler 31. Oil Separator Vent Line 32. Muffler FRONT VIEW Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics SR20_MM71_1584A Figure 2 Engine Components - Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics (Sheet 3 of 4) Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics Page 15
33 34 35 36 37 38 39 47 LEGEND 33. Induction Duct Assembly 34. Alternate Air Duct 35. Oil Cooler 36. Oil Filler Port 37. Dipstick 38. Wiring Harness 39. Intake Manifold 40. Plenum Chamber 40 41 42 43 44 45 46 41. Fuel Boost Pump 42. Induction Air Filter 43. Manifold Air Pressure Sensor 44. Fuel Line 45. Upper Spark Plug 46. Fuel Pump 47. Fuel Manifold Valve Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics SR20_MM71_1585A Figure 2 Engine Components - Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics (Sheet 4 of 4) Page 16 Serials 1268 thru 2015, 2016 & subs w/o Perspective Avionics
2 3 5 1 6 7 8 9 10 11 12 13 14 LEGEND 1. Alternator Sheave 2. Throttle Body 3. Throttle Control Cable 4. Alternator 5. Battery 6. Governor 7. Exhaust Gas Temperature Probe 8. Valve Cover 9. Lower Spark Plug 10. Oil Pressure Sensor 11. Cylinder Head Temperature Sensor 12. Governor Control Cable 13. Crankcase Oil Drain 14. Exhaust Collector 15. External Power Receptacle 16. Master Control Unit 17. Tailpipe 4 15 16 17 Serials 2016 & subs w/ Perspective Avionics SR20_MM71_3035 Figure 3 Engine Components - Serials 2016 & subs w/ Perspective Avionics (Sheet 1 of 4) Serials 2016 & subs w/ Perspective Avionics Page 17
18 19 26 21 22 20 23 24 25 23 NOTE Serials w/ Air Conditioning. AFT VIEW Serials 2016 & subs w/ Perspective Avionics LEGEND 18. Oil Separator 19. Left Magneto 20. Tachometer Sensor Assembly 21. Right Magneto 22. Starter 23. Engine Mount Isolator 24. Engine Mount Weldment 25. Oil Filter 26. Compressor SR20_MM71_3036A Page 18 19 Sep 2010 Figure 3 Engine Components - Serials 2016 & subs w/ Perspective Avionics (Sheet 2 of 4) Serials 2016 & subs w/ Perspective Avionics
27 28 29 30 31 33 32 LEGEND 27. Engine Baffle 28. Alternator 29. Oil Separator Line 30. Propeller Mount 31. Heater Muffler 32. Oil Separator Vent Line 33. Muffler FRONT VIEW Serials 2016 & subs w/ Perspective Avionics SR20_MM71_3037A Figure 3 Engine Components - Serials 2016 & subs w/ Perspective Avionics (Sheet 3 of 4) Serials 2016 & subs w/ Perspective Avionics Page 19 19 Sep 2010
34 35 36 37 38 39 40 48 LEGEND 34. Induction Duct Assembly 35. Alternate Air Duct 36. Oil Cooler 37. Oil Filler Port 38. Dipstick 39. Wiring Harness 40. Intake Manifold 41. Plenum Chamber 41 42 43 44 45 46 47 42. Fuel Boost Pump 43. Induction Air Filter 44. Manifold Air Pressure Sensor 45. Fuel Line 46. Upper Spark Plug 47. Fuel Pump 48. Fuel Manifold Valve Serials 2016 & subs w/ Perspective Avionics SR20_MM71_3038A Page 20 19 Sep 2010 Figure 3 Engine Components - Serials 2016 & subs w/ Perspective Avionics (Sheet 4 of 4) Serials 2016 & subs w/ Perspective Avionics
4. MAINTENANCE PRACTICES A. Engine (1) Removal - Engine CAUTION: Note: Place a tail stand of suitable capacity under tail of airplane before removing engine. Label each component when disconnected to facilitate reinstallation. Protect openings exposed as a result of removing or disconnecting components against entry of foreign material by installing covers or sealing with tape. (a) (b) (c) Place all electrical switches in the cockpit in the OFF position. Serials 2065 & subs w/ Air Conditioning: Pull COMPRESSOR/CONTROL PANEL circuit breaker. Set fuel selector valve to the OFF position. (d) Remove engine cowling. (Refer to 71-10) (e) Remove battery. (Refer to 24-30) (f) Drain gascolator and fuel lines. (Refer to 12-10) (g) Drain engine oil sump. (Refer to 12-10) (h) Remove spinner and propeller. (Refer to 61-10) (i) Disconnect magneto primary lead wires at magnetos. (Refer to 74-10) (j) Disconnect electrical cable at starter. (Refer to 80-10) (k) Disconnect exhaust gas temperature probe. (Refer to 77-20) (l) Remove exhaust system. (Refer to 78-10) CAUTION: When removing throttle and governor control cables, note EXACT size, position, and number of attaching washer or spacers for reference on reinstallation. Use care to avoid bending cable controls too sharply. (m) Disconnect throttle and mixture control cables at engine. Remove clamps securing cables to engine and pull cables aft, clear of engine. (Refer to 76-10) (n) Disconnect governor control cable at governor. (Refer to 61-20) (o) Disconnect alternate air control cable at induction duct assembly. (Refer to 71-60) (p) Serials 2065 & subs w/ Air Conditioning: Disconnect compressor. (Refer to 21-50) 1 Discharge air conditioning system. (Refer to 12-10) 2 Disconnect resistor wire from wire harness. 3 Disconnect compressor hoses from firewall. 4 Cap fittings and hoses. (q) Disconnect all environmental air flexible hoses and ducts and remove from airplane. (Refer to 21-00) (r) Disconnect tachometer sensor lead at connector. (Refer to 77-10) (s) Disconnect manifold air pressure sensor lead at connector. (Refer to 77-10) (t) Disconnect oil pressure sensor lead at connector. (Refer to 79-30) (u) Disconnect electrical wires at alternator(s). (Refer to 24-30) (v) Disconnect all clamps and ties attaching wires or cables to engine and pull wires and cables aft, clear of engine. (w) Serials 1005 thru 1267: Disconnect vacuum lines at vacuum pumps. (Refer to 37-10) Page 21 19 Sep 2010
WARNING: Residual oil and fuel draining from engine hoses and lines constitutes a fire hazard. Caution must be used to prevent the inadvertent pooling of such materials when lines or hoses are disconnected. (x) (y) (z) (aa) Disconnect oil breather vent line at the oil separator. Disconnect fuel pump supply line at pump and cap line. Disconnect fuel return line at aft baffle and cap line. Disconnect fuel system vent line at tee located beneath engine. CAUTION: Prior to removing engine attach bolts, ensure all hoses, wires, lines, cables, cable ties, and clamps are disconnected or removed from positions which would interfere with engine removal. (ab) (ac) (ad) Attach hoist at forward and aft lifting rings. Loosen bolts securing engine to engine mounts. Lift engine with hoist just enough to relieve weight from engine mounts. CAUTION: Note location and position of engine mount isolators prior to engine removal for reference on reinstallation. (ae) Remove grounding straps, nuts, washers, and bolts securing engine to engine mount. (af) Slowly hoist engine away from airplane, guiding the detached parts out as the engine is removed. (ag) Preserve engine in accordance with the manufacturer s approved Instructions For Continued Airworthiness. (2) Installation - Engine Note: Remove all protective caps and identification tags as each component is installed. Prior to installing engine, install all components that were removed from engine after engine was removed from airplane. Page 22 19 Sep 2010 (a) De-preserve engine in accordance with the manufacturer s approved Instructions For Continued Airworthiness. (b) Insert all upper isolators onto engine mount points and slowly lower engine onto engine mount weldment so isolators are loosely held in place. (c) Assemble engine mount isolators. (Refer to 71-20) (d) Install engine mount bolts, washers, and nuts. Torque nuts to 450-500 in-lb (51-56 Nm). (Refer to 71-20) (e) Remove hoist and tail stand. (f) Serials 1005 thru 1267: Connect vacuum lines to vacuum pumps. (Refer to 37-10) (g) Connect oil breather vent line at the oil separator. (h) Connect fuel pump supply line at pump. (i) Connect fuel return line at aft baffle. (j) Connect fuel vent line at tee located beneath engine. (k) Connect alternator leads and wiring at alternator(s). (Refer to 24-30) (l) Connect oil pressure sensor lead. (Refer to 79-30) (m) Connect manifold pressure sensor lead. (Refer to 77-10) (n) Connect tachometer sensor lead. (Refer to 77-10) (o) Attach and connect all environmental air flexible hoses and ducts. (Refer to 21-00) (p) Serials 2065 & subs w/ Air Conditioning: Connect compressor. (Refer to 21-50)
1 Connect resistor wire to wire harness. 2 Remove caps from fittings and hoses. 3 Connect 5/8 inch (19 mm) compressor hose to firewall. Torque hose and fittings to 250 to 350 in-lb (28.2-39.5 Nm). 4 Connect 1/2 inch (16 mm) compressor hose to firewall. Torque hose and fittings to 180 to 240 in-lb (20.3-27.1 Nm). (q) Connect alternate air control cable at induction duct assembly. (Refer to 71-60) (r) Connect governor control cable. (Refer to 61-20) (s) Connect throttle and mixture control cables. Adjust power control cables. (Refer to 76-10) (t) Install exhaust system. (Refer to 78-10) (u) Connect exhaust gas temperature probe. (Refer to 77-20) (v) Connect starter electrical cable. (Refer to 80-10) (w) Connect magneto primary lead wires. (Refer to 74-10) (x) Install propeller and spinner. (Refer to 61-10) (y) Ensure any other lines, hoses, electrical leads, clamps, and ties disconnected during removal of engine are installed. (z) Fill engine with proper grade and amount of engine oil. (Refer to 12-10) (aa) Install battery. (Refer to 24-30) (ab) Set fuel selector valve to the ON position, open throttle and mixture to full, turn on electric full pump, and check fuel lines for leaks. (ac) Perform Airplane Operational and Functional Check. (Refer to 05-30) (ad) Install engine cowling. (Refer to 71-10) (ae) Serials 2065 & subs w/ Air Conditioning: Perform Inspection/Check - System Plumbing Refrigerant Leak Test. (Refer to 21-50) (af) Serials 2065 & subs w/ Air Conditioning: Charge air conditioning system. (Refer to 12-10) (ag) Serials 2065 & subs w/ Air Conditioning: Reset COMPRESSOR/CONTROL PANEL circuit breaker. (ah) Serials 2065 & subs w/ Air Conditioning: Perform Operational Test - Air Conditioning System. (Refer to 21-50) Page 23 19 Sep 2010
B. Engine Baffling (See Figure 4) CAUTION: Proper baffling installation and care is critical to engine cooling. If baffles or seals are broken or misshaped, the amount of air flowing past a particular cylinder or component will increase. The increased airflow in one area causes a reduction of airflow past other components and leads to higher temperatures in some parts of the engine. Ensure baffles are installed correctly and seals fit and direct airflow in the proper direction. Various lines, hoses, wires, and controls are routed through some baffles. Ensure that these components are reinstalled correctly after baffle installation. (1) Removal - Engine Baffling (a) Remove engine cowling. (Refer to 71-10) (b) Serials 1005 thru 1147: Remove screws and washers connecting wires to landing light assembly. (Refer to 33-40) (c) Disconnect any lines, hoses, wires, and controls routed through baffling. (d) Remove tension springs. (e) Remove bolts, screws, washers, and nuts securing baffling to engine. (f) Remove baffling from airplane. (2) Installation - Engine Baffling (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose High Temperature Silicone Sealant RTV 736 Dow Corning Sealant. (b) Position baffling to engine and secure with bolts, screws, washers, and nuts. (c) Install tension springs. (d) Connect any lines, hoses, wires, and controls routed through baffling. (e) Serials 1005 thru 1147: Install screws and washers connecting wires to landing light assembly. (Refer to 33-40) (f) Install engine cowling. (Refer to 71-10) Page 24
1 1 7 3 2 Serial 1005 thru 1422. 1 1 6 5 3 2 3 2 4 3 3 4 5 4 3 Serials 1005 thru 1147. LANDING LIGHT (REF) NOTE 6 3 2 Fasten using engine hardware plus washer. Serials 1005 thru 1422: Fasten using bolts in place of screws. 3 4 LEGEND 1. Baffle Assembly 2. Bolt 3. Washer 4. Nut 5. Screw 6. Tension Spring 7. Grommet SR20_MM71_1879A Figure 4 Engine Baffling Installation Page 25
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