Standard Motor Products Engine Oil Pressure Relief Valve Spring
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An engine's oil pressure relief valve is a small component with a big job, and the spring behind it determines exactly when that valve opens. A Standard Motor Products engine oil pressure relief valve spring is a replacement part that helps keep lubrication pressure within a safe range as engine speed and oil temperature change.
What the Relief Valve Spring Does
In a typical design, the relief valve consists of a plunger or poppet held against its seat by a heavy spring. When pressure from the oil pump climbs past the spring's rated force, the valve opens and bleeds excess oil back to the pan or pump inlet. When pressure drops, the spring closes the valve again. The spring rate therefore sets the engine's maximum oil pressure.
Over many heat cycles, a spring can lose tension. A weakened spring lets the valve open too early, which can show up as low oil pressure at higher rpm. A stuck valve is a related problem, since a plunger that sticks closed can cause excessive pressure at high engine speed, while one that sticks open can cause very low pressure at idle. Replacing a tired spring when the valve is serviced is a practical way to restore correct pressure regulation.
Why Standard Motor Products
Standard Motor Products (SMP) has been in the automotive aftermarket since 1919, and its roots are in ignition and electrical parts. The company built its reputation on the idea that a replacement part should meet or beat the original. That philosophy is behind its Blue Streak line, introduced in 1934 as a premium-quality program meant to counter doubts about aftermarket parts. Today SMP operates facilities across North America, Europe and Asia, and supplies repair shops, distributors and retailers with a broad range of engine management, temperature control and related components.
That engineering-first, fit-and-function mindset is what shoppers are buying into when they choose an SMP engine component. If you want to see how this part fits into the broader lineup, visit the full Standard Motor Products brand page.
Shopping Considerations
- Match the application: Relief valve springs are specific to the engine and oil pump design. Free length, wire diameter and spring rate all matter, so confirm fitment by year, make, model and engine.
- Inspect the whole assembly: Check the plunger or poppet and its bore for galling, scoring or debris while the spring is out. A new spring will not cure a valve that sticks.
- Replace seals and washers: If the valve is retained by a cap or plug, a fresh sealing washer helps prevent oil seepage after reassembly.
- Verify with a gauge: After installation, confirm oil pressure with a mechanical gauge rather than relying only on the dash light or sender reading.
Explore More
Oil pressure problems can have several causes, including worn bearings, a tired oil pump or a clogged pickup screen, so the relief valve spring is best treated as one part of a systematic diagnosis. To compare other parts that serve this function across makers, browse the complete Engine Oil Pressure Relief Valve Spring category.