Which of the following types of diesel engine lubricating oil filtration schemes must be equipped with a bypass relief valve to ensure that the engine bearings are not starved of oil if the filter element should become severely restricted or blocked?
β’ Difference between full-flow versus bypass/shunt lubrication filtration paths β’ What happens to oil flow to bearings if the only path goes through a clogged filter β’ Purpose of a bypass relief valve in protecting engine parts
β’ For each filtration scheme, ask: does all the oil to the bearings go through this filter, or just part of it? β’ If the filter in that scheme became completely blocked, what path (if any) would oil have to still reach the bearings? β’ Which scheme would be most dangerous to bearings if the filter clogged and there was no relief or alternate path?
β’ Identify which scheme sends 100% of the pump discharge directly through the filter before the bearings β’ Confirm which schemes have an alternate or parallel path that does NOT depend on the primary filter being clear β’ Focus on the scheme where a blocked filter would mean no oil flow to the bearings unless a relief valve opened
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