Performance Water Pump Kit for Mercedes Benz SLK-Class (2012-2016) 3.5L

Complete Cooling System & Accessory Drive Refresh Kit for 2012-2016 Mercedes Benz SLK-Class (R172)

What it Does: The Performance Water Pump Kit refreshes the entire primary cooling and front-end accessory drive circuit on the 2012-2016 Mercedes Benz SLK-Class to eliminate thermal runaway risks and maintain precise coolant flow under high engine loads.

The Stock Mercedes Benz SLK-Class Thermal & Belt Drive Weaknesses

Factory cooling components on the naturally aspirated M276 3.5L V6 degrade significantly under continuous heat-cycling. The factory water pump mechanical shaft seal develops micro-weeps over time, causing coolant cavitation, localized cylinder head hot spots, and bearing play. Compounding this, the composite thermostat housing is vulnerable to internal bypass valve sticking and hairline flange fractures. Concurrently, thermal fatigue softens the spring-loaded belt tensioner and hardens idler pulley bearings in the R172 engine bay, introducing parasitic drag, belt slip, and decreased impeller RPM that risks severe engine overheating.

The Engineering Solution

This comprehensive service assembly restores baseline thermal hydraulic dynamics using an OEM-grade mechanical water pump engineered with reinforced internal bearings and a heavy-duty unitized shaft seal. The included thermostat housing assembly features a calibrated wax element ensuring exact opening temperatures for optimal combustion efficiency. Paired with a precision-damped serpentine belt tensioner, hardened idler pulley, and heavy-duty EPDM serpentine drive belts, this kit maintains optimal belt grip and stable coolant flow velocity. Pre-matched elastomeric gaskets and high-temperature O-rings ensure direct-fit sealing without reliance on RTV.

What's Included

• 1 Mechanical Water Pump Assembly
• 1 Water Pump Gasket
• 1 Engine Coolant Thermostat Housing Assembly with Thermostat
• 1 Serpentine Belt Tensioner Assembly
• 1 Idler Pulley with Mounting Hardware
• 2 Serpentine Drive Belts
• 1 O-Ring

Technical Specifications

Compatibility

• 2012-2016 Mercedes-Benz SLK-Class SLK350 (3.5L V6 Naturally Aspirated Gas)

Frequently Asked Questions & Fitment Warnings

Does this fit the R172 SLK-Class?

Yes, this is a direct fit for the 2012-2016 Mercedes Benz SLK-Class equipped with the M276 3.5L V6 engine. Does not fit 1.8L/2.0L turbocharged inline-4 (SLK250/SLK300) or 5.5L V8 (SLK55 AMG) models.

Do I need to bleed the cooling system after installing this kit?

Yes, the M276 architecture requires a complete vacuum purge and refill procedure to eliminate air pockets from the engine block, heater core, and thermostat passage.

The Mercedes Benz Precision Standard

Engineered to meet rigorous German roadster tolerances, this cooling package delivers factory-matched thermal heat extraction, zero Check Engine Lights, and long-term drivetrain reliability under aggressive driving conditions.