Every aircraft engine needs a push to get started, especially when the engine is cold. Modern Continental engines utilize a starter adapter to provide the power boost needed to get the engine going.
The aircraft starter motor bolts at a right angle to the starter adapter. When the starter motor begins to spin, it turns the input shaft inside the starter adapter. That shaft has a worm gear on the end, which transfers the spinning motion to a larger brass gear. That brass gear is attached to a large spring that tightens around the drive shaft as the gear rotation speed increases. The tightening spring eventually begins to turn the drive shaft, starting the engine. Soon, the engine speed exceeds the drive shaft rotational speed, which releases the spring tension and turns off the starter adapter.
We have the capability to overhaul nearly every Continental starter adapter with a quick turn time and torque test to verify operation before leaving our shop.