What can occur if the cylinder ring ridge is not removed?

What can occur if the cylinder ring ridge is not removed?

• A. The engine will overheat
• B. The oil filter will clog
• C. The top ring and piston ring groove could be damaged
• D. The spark plugs will foul

Answer: (C)

When a ring ridge remains at the top of the bore, it can physically catch or bind the upper piston ring as it moves up and down. That interference can score or nick the top ring and even damage the ring groove in the piston. Once the ring is damaged or the groove is deformed, sealing is compromised, leading to reduced compression, increased oil consumption, and accelerated wear. This is why bore finishing to remove the ridge is essential before reassembly. The other potential issues listed aren’t direct consequences of a ridge. Overheating, oil filter clogging, or spark plug fouling come from different systems or conditions and aren’t caused by leaving a ridge in the cylinder bore.

When a ring ridge remains at the top of the bore, it can physically catch or bind the upper piston ring as it moves up and down. That interference can score or nick the top ring and even damage the ring groove in the piston. Once the ring is damaged or the groove is deformed, sealing is compromised, leading to reduced compression, increased oil consumption, and accelerated wear. This is why bore finishing to remove the ridge is essential before reassembly.

The other potential issues listed aren’t direct consequences of a ridge. Overheating, oil filter clogging, or spark plug fouling come from different systems or conditions and aren’t caused by leaving a ridge in the cylinder bore.