Oil filtration system and method

A lubricant filtration system for an engine having an engine bearing lubricated by a pressurized lubricant supply, the system comprising:

• a lubricant flowable through a primary lubricant filter disposed in a first lubricant-bearing conduit,
• a first differential pressure sensor disposed in a parallel circuit arrangement across the primary filter,
• a secondary lubricant filter,
• means for diverting the lubricant flow from the primary filter to the secondary filter in response to a first sensed pressure differential exceeding a preselected value, and
• means, responsive to a second sensed pressure detected downstream of the secondary filter, for rerouting the lubricant flow away from the primary and secondary filters.

A lubricant filtration system for an engine having an engine bearing lubricated by a pressurized oil supply, the system comprising:

• a lubricant flowable through a primary lubricant filter disposed in a first lubricant-bearing conduit,
• a first differential pressure sensor disposed in a parallel circuit arrangement across the primary filter, the first sensor having means for indicating a first level warning indicative of an excessive pressure,
• a secondary lubricant filter disposed downstream of the primary filter,
• the lubricant flow divertable from the primary filter to the secondary filter through a bypass valve disposed upstream of both filters in response to a first level warning from the first sensor,
• a pump relief valve disposed upstream of the bypass valve, and
• the pump relief valve responsive to a second pressure sensor disposed downstream of the primary filter, the second sensor having means for indicating a second level warning indicative of a pressure greater than that indicated by the first level sensor,
• the pump relief valve, responsive to the second level warning, diverting the flow around the primary and secondary filters and the engine bearing.