Valves & Parts

Engine Valves Control Combustion Chamber Flow

Whether you're restoring a classic or fixing your own ride, Stellantis Canada always has all the parts you need. Engine valves open and close thousands of times per minute to control air intake and exhaust gas release. These precision-machined components include intake valves, exhaust valves, valve springs, retainers, and keepers. Factory valves use heat-resistant alloys that withstand combustion temperatures exceeding 1,500 degrees. Proper valve operation ensures complete combustion and maximum power output.

Understanding Valve Train Operation

Your engine valves seal against machined seats in the cylinder head. Camshaft lobes push against rocker arms or directly against valve stems to open them at precise intervals. Valve springs force the valves closed after the cam lobe passes. Intake valves allow air and fuel into the combustion chamber during the intake stroke. Exhaust valves release burned gases after combustion. The valve face angles match the seat angles to create gas-tight seals. Valve stem seals prevent oil from entering the combustion chamber. Mopar valve assemblies for vehicles like the Dodge Ram and Chrysler Pacifica use specific materials matched to compression ratios and fuel requirements. Spring pressure must balance quick closing action against reduced wear on engine components.

Why Valve Components Wear Out

Exhaust valves suffer the most damage from extreme heat exposure. The valve face erodes when combustion deposits prevent proper seating. Valve stems wear where they slide through guides in the cylinder head. Valve springs lose tension from millions of compression cycles and no longer close valves quickly enough. Keepers groove the valve stem from repeated impact. Carbon buildup on valve faces prevents complete sealing. Valve stem seals harden and crack, allowing oil consumption. Bent valves result from timing belt failure or interference with pistons. Generic aftermarket valves often use softer materials that wear rapidly. Valve seat recession occurs when unleaded fuel removes the protective lead coating that older engines depended on. Overheating warps valve faces and destroys sealing surfaces.

Recognizing When Valves Need Service

Replace valve components when compression testing reveals low cylinder pressure. Blue smoke from the exhaust indicates oil passing worn valve stem seals. Misfires that don't respond to spark plug replacement suggest valve sealing problems. Ticking noises from the valve cover area indicate worn valve train components. Loss of power and poor fuel economy often result from valves that no longer seal properly. Valve adjustment becomes necessary more frequently when components wear. Most valve springs require replacement at 100,000 miles or during major engine work. Check valve clearances during timing belt replacement. Engines that overheat severely need valve inspection for warping. Genuine Mopar valves use correct materials and dimensions for reliable sealing and longevity, unlike aftermarket valves that may not match original specifications or withstand sustained high-temperature operation.

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