When water has been entering the combustion chamber from a leaking head gasket or a crack in the head, there will be carbon on the surfaces of the combustion chamber and piston.

Question

Quizplus · Accepted Answer

Water entering the combustion chamber from a leaking head gasket or a crack in the head typically results in steam cleaning of the surfaces, leading to unusually clean areas on the piston and combustion chamber surfaces, not carbon buildup.

When Water Has Been Entering the Combustion Chamber from a Leaking