A bypass valve is installed to provide continual oil flow in the event of a clogged supply oil filter.

A bypass valve is installed to provide continual oil flow in the event of a clogged supply oil filter.

• A. False
• B. Not installed
• C. True
• D. Only during start

Answer: (C)

The oil system includes a bypass path to prevent oil starvation if the filter becomes blocked. When the supply oil filter starts to clog, the pressure across the filter rises. A bypass valve opens at a preset differential pressure, allowing oil to flow directly to the engine without passing through the clogged filter. This keeps lubrication available for bearings and gears, even though the oil is unfiltered for a short time. It’s a safety feature for abnormal conditions, not a normal operating mode, and the clogged filter should be cleaned or replaced as soon as possible.

The oil system includes a bypass path to prevent oil starvation if the filter becomes blocked. When the supply oil filter starts to clog, the pressure across the filter rises. A bypass valve opens at a preset differential pressure, allowing oil to flow directly to the engine without passing through the clogged filter. This keeps lubrication available for bearings and gears, even though the oil is unfiltered for a short time. It’s a safety feature for abnormal conditions, not a normal operating mode, and the clogged filter should be cleaned or replaced as soon as possible.