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Lycoming O-320, IO-320, O-360, IO-360, O-540, IO-540, IO-720, Narrow deck (old standard) cylinder base wrenches

 Typical long standard size cylinder base wrenches.  Short hex drive cylinder base wrenches for restricted access

Cylinder base wrench kit

Cylinder removal and installation of narrow deck cylinders requires cylinder base wrenches with hex drives.  There are only two sizes of nuts for cylinder installation.  Two of the large size wrenches are required to tighten the through studs properly (one for each nut).

Cylinder installation tool kit

We are designing the following aircraft cylinder tool rental kit for removing and reinstalling cylinders.  Kits would include the following items.

  1. 1/2" drive breaker bar
  2. 1/2" drive long handle socket wrench
  3. 3/8" drive calibrated torque wrench with 1/2" drive adapter
  4. 1/2" drive extensions - three sizes
  5. 3/4" 1/2" drive socket for through studs
  6. 1/4" drive socket wrench
  7. 1/4" drive calibrated torque wrench
  8. 1/4" drive wobble socket extension for removing exhaust
  9. Other 1/4" drive accessories for removing exhaust
  10. Torque screwdriver for torquing rocker box cover screws
  11. Containers to store push rods
  12. Containers to store rockers and other components
  13. Gauges for measuring valve lash
  14. Spring clamps for checking valve lash
  15. Ring compressor
  16. Tool for removing and installing rocker shafts
  17. Socket for removing injectors
  18. Spacers for tightening the through studs while the cylinders are off.**See Note 
  19. Lycoming Service Instruction 1029D - cylinder stud torque instructions

Additionally we hope to include a piston pin press that we are designing.  

Contact us at Little Flyers for specific cylinder wrench kits.  We design them to your needs.  

Basic kit can be found at: Lycoming Specific Tools

** As the cylinder(s) on a through stud are removed, the through stud needs to be retightened to prevent movement of the crankshaft bearings.  Never leave a through stud un-tightened!  Damage can result.


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