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Camshaft and VacuumPump -Backlash  .004 .015 
Camshaft and Vacuumand Oil Pump Drive -Backlash  .006 .014 
Camshaft and Fuel Pump -Backlash  .004 .015 
Camshaft and Crankshaft Idler -Backlash  .004 .015 
Crankshaft and Crankshaft Idler -Backlash  .004 .015 
Magneto Drive and Crankshaft Idler -Backlash  .004 .015 
Magneto Drive and CrankshaftGear -Backlash  .006 .014 
CrankshaftGear and Vacuum and Oil Pump Drive -Backlash  .006 .014 
Oil Pump Impellers -Backlash  .008 .015 
Oil Pump Impellers -Backlash  .008 .012 
Oil Pump Drive and Crank-shaft Idler -Backlash  .004 .015 
Magneto and Magneto ShaftGear -Backlash  .004 .015 
AccessoryDrive Shaft Gearand MagnetoDriven ShaftGear -Backlash  .003 .005 
Crankshaft Gear and AccessoryDrive Shaft Gear -SplineBacklash  .002 .005 
Camshaft and Propeller Governoror Hydraulic Pump -Backlash  .004 .015 
Governor or Hydraulic Pump Drive and DriveGear -Spline Backlash  .0013 .0073 
Governor or Hydraulic Pumpand Idler -Backlash  .004 .015 
Vacuum Pump and Idler -Backlash  .004 .015 
AN Fuel Pump Idler andCrankshaft Idler -Backlash  .004 .015 
AN Fuel Pump Idler and Fuel Pump Drive -Backlash  .004 .015 

1-28

Serv.
Max.

.020 .020 .020 .020 .020 .020 .020 .020 .020 .020 .020 .020 .012
.015 .020
.010 .020 .020 .020

SERVICE  TABLE  OF  LIMITS 
PART  1 DIRECT  DRIVE  ENGINES 
SECTION IV BACKLASH 

Ref.  Ref.  Chart  Nomenclature  Dimensions  Clearances 
Mfr.  Mfr. 
New  Old  Min.  Serv.  Min.  Serv. 
&  Max.  &  Max. 
Max.  Max. 
819  973 S-T-AF  Crankshaft Gear and AN Fuel  .004 
973 (DUAL MAGNETO)  Pump Idler -Backlash  .015  .020 
820  974  T-AF  Hydraulic Pump and Crankshaft Idler -Backlash  .004 .015  .020 
821 676  G-J-S  Propeller Governor Drive and 
Crankshaft Idler -Backlash  .004 
(Rear Governor)  .020 
822  -G2-T-AF S2-S4-S6- Propeller Governor Idler and Camshaft -Backlash (FrontGovernor)  .004 .015  .020 
823 669  G1-G2-S2-S4-S6-T-AF S2-S4-S6- Propeller Governor Drive and Idler -Backlash (Bevel Gears) (Front Governor)  .004 005  .015 
824 669  BD-BE  Propeller Governor Drive and 
Camshaft -Backlash (BevelGears) (Front Governor)  .003 .011  .015 
825 550  D  Crankshaft Timing Gear and  .004 
Camshaft Gear -Backlash  .015  .020 
　
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