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TCM - Continental IO346, O-470, IO470, TSIO470 IO-520, TSIO-520, GTSIO-520, IO550 cylinder base wrenches

Basic cylinder base wrench kit

Cylinder removal and installation of small bore TCM engines with reduced dimension nuts requires two standard cylinder base wrench sizes 5/8" and 9/16".  Middle cylinders will require an additional 5/8" cylinder wrench to tighten the through stud.  Our cylinder base wrench kit includes 2 ea. 5/8" and 2 ea. 9/16" wrenches.  This kit is for O, IO-470 engines.

Kit information can be found here: TCM Specific Tools

Cylinder base wrench kit for 7th stud engines

This cylinder wrench kit is for TCM Continental 520 and 550 engines.  These engines are equipped with a 7th stud on the right side of each cylinder base.  Two additional wrenches are included for engine with cradle engine mounts on the crankcase.    

Kit information can be found here: TCM Specific Tools

Cylinder Base wrench kit for Bonanzas

Cylinder removal and installation of cylinders on TCM equipped Beech Bonanzas.  Access to the cylinder hold down nuts is very restricted on this engine.  We have modified a number of wrenches to help with cylinder R&R on this type of aircraft.  This kit works with 470's, 520's, and 550's.


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
  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. Push rod housing tool for TCM
  12. Containers to store push rods
  13. Containers to store rockers and other components
  14. Gauges for measuring valve lash
  15. Spring clamps for checking valve lash
  16. Ring compressor
  17. Tool for removing and installing rocker shafts
  18. Socket for removing injectors
  19. Spacers for tightening the through studs while the cylinders are off.**See Note 
  20. TCM booklets for torques and cylinder installation instructions

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

We design the kits based on your needs.  Contact us at Little Flyers 1-800-262-9644.

Kit information can be found here: TCM 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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