A ridge reamer is used to remove ridges formed at the tops of cylinders produced by piston rings moving up and down in the cylinders. Figure 2-16 illustrates a typical ridge reamer.

The ridge reamer consists of a carbon cutter, adjustable guides, adjustable cutter head, adjustable cutter, and threaded feed screw.

Whenever you use a ridge reamer, you must wear eye protection, such as a face shield or goggles.

Figure 2-14.Torque calculation for eithcr adapters or extensions.

Remember that the cutter will take out the ridge with a lathelike cutting action. Read and follow the manufacturers manual on how to use the reamer. After all the ridges are removed, take a measurement with a bore gauge, and verify that the cylinder is within specifications.