Before removing the pistons from the engine, the ring ridge from the top of the cylinder must be removed first.

• A. True
• B. False
• C. It Should Be Done After Piston Removal
• D. Not Required If The Engine Is Low Mileage

Answer: (A)

A raised ring ridge at the top of a cylinder bore can catch the piston rings as you push the piston out. If you don’t remove or properly break the ridge first, the rings can snag, causing damage to the rings or scoring of the bore. Removing the ridge before piston removal creates a smooth path for the rings to pass the top of the bore without harm, which is why this step is necessary. The ridge is not something you wait on until after removal, and its presence isn’t strictly tied to how low the engine’s mileage is, so those other ideas aren’t reliable.