Lycoming O-235 Cylinder base wrenches

Cylinder Base wrench kit

Cylinder removal and installation of O-235 cylinders 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.

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. 1/2" drive calibrated torque wrench
4. 1/2" drive extensions - three sizes
5. 9/16" and 5/8" drive socket for small bore
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. Spacers for tightening the through studs while the cylinders are off.**See Note 
18. Lycoming service instruction 1029D - cylinder torque instructions

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

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

Basic kit information can be found here: 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.