Exam Question

### (a) Water Mixed in the Crankcase Oil
#### Causes:
* **Jacket Water Cooler Seal Failure:** The most common cause is the failure of synthetic rubber O-rings that seal the wet-type cylinder liners at the bottom of the cylinder block. Deterioration due to age, heat, or improper installation allows jacket cooling water to leak directly into the crankcase, contaminating the lubricating oil.
* **Cooler Tube Leakage:** Pinhole leaks or cracks in the tubes of the intercoolers or aftercoolers. This allows cooling water (typically from the LT Central Cooling Water system) to enter the air side. During compressor standstill, this water can drain back through the suction valves and seep past the piston rings into the crankcase.