S4DS025 Turbocharger for Caterpillar 3406B 14.6L | New

S4DS025 199119 Turbocharger for Caterpillar 3406B 3406C 14.6L

S4DS025

The S4DS025 is a BorgWarner/Schwitzer-pattern single turbocharger for the Caterpillar 3406B and 3406C 14.6L diesel. It is the unit fitted to 2EK and 4CK serial-prefix engines rated around 460HP, running a 1.72 A/R turbine housing suited to the steady load these older trucks and industrial engines carry. This is a direct-fit replacement that bolts to the factory mounting. Our S4DS025 is built new to OEM-spec and balanced before it ships, and we confirm the part number against your engine serial first. We supply repair shops, fleets and distributors with single units and bulk orders.

Turbo Model

S4DS025

OEM / Interchange Numbers

199119, 178063, 178120, 198123, 199114, 0R6051, 0R6053, 466041-0001, 466372-0002

Application

Caterpillar 3406B / 3406C 14.6L, 2EK / 4CK prefix, ~460HP

Service & Support

1-Year Unlimited-Mileage Warranty
US Stock, Fast Dispatch
Bulk Orders Welcome
White-Label Support
Fully Certified

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FAQ

The S4DS025 fits the Caterpillar 3406B and 3406C 14.6L diesel, rated around 460HP. Confirm by the part number on your current turbo.

It covers the 2EK and 4CK engine serial prefixes. Read your engine serial before ordering, since 14.6L 3406 engines used a few related turbos.

Yes. The 3406B is out of production and original turbos are scarce, so we keep new S4DS025 units in US stock to keep these engines working without the wait.

Yes, brand new with 100% new components, built to OEM-spec and balanced before dispatch. No core charge and nothing to return. One-year warranty.

Yes. We hold it in US stock and supply shops, fleets and distributors with single units or bulk orders, priced for resale.

S4DS025 Turbocharger for the Caterpillar 3406B

The S4DS025 is the original Schwitzer-pattern turbo for the 14.6L 3406B and 3406C. These older engines are still working hard, and parts are getting scarce, which is why a quality new replacement matters.

What it fits

This unit fits the 3406B and 3406C 14.6L on the 2EK and 4CK serial prefixes, at around 460HP and 1800 RPM. It is a complete single turbo with a 1.72 A/R turbine housing. Confirm your serial prefix and the number on the old turbo, since 14.6L 3406 engines used a few related turbos that are not interchangeable internally.

Older engine, scarce parts

The 3406B has been out of production for years and original turbos are getting hard to find. Keeping a new S4DS025 on the shelf means a 3406B truck, genset or loader doesn't sit waiting on a discontinued part.

Detail	S4DS025
Turbo frame	S4DS025 (Schwitzer pattern)
Turbine housing A/R	1.72
Engine	3406B, 3406C 14.6L
Serial prefix	2EK, 4CK
Power	~460HP @ 1800 RPM

Signs the turbo is worn

Watch for lost boost and power, dark smoke, a whistle, oil at the seals and felt shaft play.

Before you install

On these older engines, check the oil feed and drain lines carefully and clear any sludge, prime the new turbo with clean oil, and inspect the intake for debris. Sorting the cause first protects the new unit and keeps the warranty valid. See our quality process for how each unit is tested.