CUMMINS 3947759 VALVE TAPPET | OEM FIT 2003-2018 5.9L & 6.7L CR

The Cummins 3947759 Valve Tappet is an essential valvetrain component used in 5.9L and 6.7L common-rail engines from 2003 to 2018. Designed as a direct-fit OEM replacement, it’s critical when installing high-performance camshafts or refreshing valvetrain components during regular service. Each tappet is sold individually, allowing you to replace only what’s worn.

Why Choose the 3947759 Valve Tappet?

• Factory Precision: Meets Cummins’ strict OEM standards for fit, finish, and durability.
• Valvetrain Protection: Larger 1.5″ footprint preserves cam lobe wear—especially important with performance cams.
• Longevity: Durable construction supports daily driving or high-RPM builds long-term.

Frequently Asked Questions

What engines use the 3947759 tappet?

Fits 5.9L & 6.7L Cummins Common Rail (ISB/QSB) engines in Dodge Ram trucks from 2003-2018.

When should these be replaced?

Always install new tappets when installing a performance cam or if signs of cam/lifter wear (“cupping”) are present.

Do I need one or a set?

Each tappet is sold individually—but a full engine requires 12 tappets. Ordering as needed saves time and money on selective rebuilds.

How do these differ from aftermarket options?

OEM Cummins tappets are built to spec with precise tolerances—often outperforming budget aftermarket parts in fit and service life.

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