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Caterpillar · Engine
3929208
In stock · ships from Knoxville
This is a plastic relief valve plunger (bypass valve) used in Caterpillar engine oil cooler and filter circuits.
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Verified fitment for 7 applications
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All confirmed applications for this part number.
Caterpillar
Other applications
Caterpillar
Other applications
Fits numerous Cat engines and machines in the oil cooler bypass valve assembly. The full list is extensive; always verify exact compatibility against your engine serial number.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 1 of 1.
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Normally it stays closed, routing oil through the filter; when the filter becomes clogged, the plunger opens to let oil bypass the filter and continue lubricating the engine, preventing oil starvation. It is replaced if it sticks, wears, or allows bypassing at low restriction—often during oil cooler servicing.
Part Number: 3929208
CAT RELIEF VALVE
Vendor: STOWERS MACHINERY
Dealer: KP Services Crossville
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