What should a technician do if there's oil buildup in the combustion chamber?

When there is oil buildup in the combustion chamber, it typically indicates that engine oil is entering the combustion space, which is often a result of worn or damaged piston rings. The piston rings serve the critical function of sealing the combustion chamber from the crankcase and regulating the amount of oil that lubricates the cylinder walls. If the rings are not functioning properly, they can allow excessive oil to pass into the combustion chamber, leading to oil burning and consequently oil buildup.

Inspecting the piston rings is crucial to identifying whether they are worn, cracked, or improperly seated. This inspection may include checking the ring gap and ensuring that the rings are not stuck in their grooves. If the piston rings are indeed the source of the issue, they will need to be replaced to rectify the oil consumption problem and restore engine performance.

Addressing oil buildup in the combustion chamber by checking piston rings can prevent further engine damage, reduce emissions, and enhance overall engine efficiency. Other options, while they may address different issues, do not directly resolve the root cause of oil entering the combustion chamber.