There are two glands provided where the piston rod exits the cylinder shown in the illustration. The purpose of the top gland is to __________. Illustration MO-0083

Correct Answer: Option B — seal against scavenge air leakage

In uniflow or port-scavenged crosshead diesels, the upper set of gland seals around the piston rod prevents high-pressure scavenge air from blowing down past the rod and escaping into the surrounding machinery space.