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Engine Cylinder Wrenches

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Find the engine cylinder wrenches that are made for your specific aircraft. The wrenches are perfectly shaped to give you easy access to nuts on Lycoming, Continental, and other engines. You also can purchase a cylinder base wrench set to cover all common nut sizes.

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Cylinder Base Wrench Set of all 4 twelve-point cylinder base wrenches (sizes: 1/2", 9/16", 5/8", and 3/4"( in 1/2" drive. Overall length 13-1/2". Heat treated. Used on all continental engines and older lycoming engines.
1/2" Twelve-point Cylinder Base Wrench with 1/2" drive. Overall length 13-1/2": Fits all continental engines and older lycoming engines.
3/4" Twelve-point Cylinder Base Wrench with 1/2" drive. Overall length 13-1/2": Fits all continental engines and older lycoming engines.
5/8" Twelve-point Cylinder Base Wrench with 1/2" drive. Overall length 13-1/2".
9/16" Twelve-point Cylinder Base Wrench with 1/2" drive. Overall length 13-1/2".
Left Mount Continental 470/520 Cylinder Wrench: The special configuration of this wrench permits access to the 470 and 520 engine mount areas. This wrench is used in the Left Mount Area See also: p/n 5204, and 5203A.
(3 & 6 Cylinders) Continental 520 Cylinder Wrench: This wrench is specially designed to gain access to the base nuts of the 520 D&H engine's #3 and #6 cylinders. See also: p/n 5204, and 5203A.
Right Mount Continental 470/520 Cylinder Wrench: The special configuration of this wrench permits access to the 470 and 520 engine mount areas. This wrench is used in the Right Mount Area See also: p/n 5203, and 5203A.
1/2" 1/2" Twelve point drive Lycoming Internal Hex Wrenches
3/8" 1/2" Twelve point drive Lycoming Internal Hex Wrenches
Continental IO-550 Cylinder Wrench: This 9/16" wrench is designed for easy access to nuts on the 550 series engines. Standard 1/2" square drive. 13" overall length. This wrench is also used on the 7th order stud of the GTSIO520BA.