Description
Manufactured by Schaeffler Group, the INA Engine Water Pump Assembly with Thermostat Housing is a fully integrated, OE-quality thermal management assembly designed to deliver precision coolant circulation and exact temperature control for modern high-performance engines. By unifying the primary mechanical water pump, heavy-duty thermostat valve assembly, and reinforced thermostat housing into a single factory-assembled unit, this product eliminates the premature coolant leaks and housing warping commonly found in multi-piece factory cooling components. Engineered to handle extreme thermal cycling and high system pressures, it ensures fast engine warm-up during cold starts while maintaining ideal operating temperatures under heavy loads. Equipped with premium silicon-carbide mechanical face seals, a corrosion-resistant impeller, and high-capacity integral shaft bearings, the INA Water Pump Assembly guarantees long-term sealing integrity and ultra-quiet operation. It is the premier plug-and-play replacement solution for professional repair centers and auto parts distributors servicing European and global vehicle platforms.
Technical Parameters
| Category | Specifications & Technical Details |
| Modular Reinforced Thermal-Resistant Housing | The pump body and thermostat housing are manufactured from high-strength glass fiber reinforced polymer (e.g., PA66-GF30) or aluminum alloy through integrated injection molding / die-casting. This housing offers extremely high thermal deformation resistance and hydrolysis resistance, withstanding long-term exposure to high-temperature coolant and severe temperature differentials in the engine bay that cause housing micro-cracks and deformation leakage. |
| Precision EPDM Rubber Molded Gaskets & Leak-Proof Ports | The housing mounting surface utilizes high-weather-resistance EPDM (ethylene propylene diene monomer) three-dimensional molded gaskets. Combined with precision-machined groove structures, it provides balanced compression force at the cylinder block joint, perfectly sealing coolant and completely resolving the common “slow seepage” issue at traditional independent thermostat housing ports. |
| Dual-Valve High-Sensitivity Thermostat Cartridge | The thermostat cartridge integrated inside the housing utilizes a micron-calibrated wax element or electrically heated valve. It features a main / bypass dual-valve switching structure, rapidly closing the large circulation loop during start-up for fast warm-up, and precisely opening the large circulation loop for heat dissipation when temperature reaches the set point. Temperature control accuracy reaches ±1°C. |
| Silicon-Carbide Mechanical Shaft Seal for Long Life | The water pump drive shaft core component utilizes a silicon carbide (SiC) paired with carbon ring dual-face mechanical seal. Even under harsh conditions where coolant contains rust impurities or suspended scale, it maintains excellent self-lubrication and sealing performance, preventing liquid from seeping into the bearing interior and causing noise or seizure. |
| Heavy-Duty Double-Row Shaft Bearing & Optimized Impeller | Internally equipped with Schaeffler (INA) OEM double-row ball-needle water pump-specific bearings, featuring high radial pull resistance capability to easily withstand the eccentric tension of the drive belt. Combined with a CFD-optimized impeller, it delivers stable high-volume circulation at extremely low pumping power. |
Applicable Car Brands & Models
Purchasing a unified assembly guarantees 100% component compatibility and pre-tested factory sealing between the pump body and the thermostat housing. Because the housing and pump are subjected to the same thermal degradation over time, replacing only one component often leads to a failure in the other shortly after. Installing the complete INA assembly saves redundant labor costs, ensures a leak-proof installation, and restores the entire cooling system to factory performance in a single service.
Key failure indicators include:
Coolant Puddles or Crusty Leak Residue: Visible fluid beneath the engine or white/pink crusty buildup around the plastic housing joints and hose connections.
Engine Overheating or Warm-up Delays: The engine running hot due to a stuck thermostat or eroded pump impeller, or failing to reach operating temperature (running too cold) due to a stuck-open thermostat.
Check Engine Light (CEL) Codes: Diagnostic trouble codes such as P0128 (Coolant Temperature Below Thermostat Regulating Temperature).
Squealing or Grinding Noises: Bearing noise originating from the water pump shaft drive.
Yes. INA complete assemblies are supplied with all required pre-fitted OE-grade EPDM gaskets, O-rings, and sealing elements necessary for a leak-free installation on the engine block.
Each INA Assembly with Thermostat Housing is sealed in a moisture-resistant protective bag with soft protective covers over sensitive sensor ports, hose spigots, and housing mating faces. It is nested securely in high-density molded foam inside a heavy-duty Schaeffler INA branded corrugated carton. For international ocean or air freight, master boxes are stacked, corner-reinforced, and shrink-wrapped onto standard export pallets.
