Thermostat Housing Gasket 1-890-631 EPS

Maintain reliable engine cooling and prevent coolant leaks with the genuine thermostat housing gasket (part 1-890-631 EPS). This precision-molded rubber seal fits between the thermostat housing and engine block on BMW 3 Series 1.6-litre models from 2000 onward, ensuring a leak-free seal and correct coolant flow for optimal temperature regulation.

Key Benefits

• Exact OEM Fit
  Engineered to BMW’s original dimensions and material specifications for a perfect, no-modification replacement.

• High-Temperature Rubber
  EPDM compound resists heat, antifreeze chemicals and repeated thermal cycling without hardening or cracking.

• Leak-Free Seal
  Precision profile ensures uniform compression around the thermostat housing, preventing coolant seepage and engine overheating.

• Engine Temperature Control
  Seals coolant flow precisely through the thermostat, maintaining correct operating temperature and protecting components.

• Direct Replacement
  Drops into the OEM groove; ideal for thermostat service, housing replacement or repair of coolant leaks.

Vehicle Compatibility

Fits BMW 3 Series models equipped with 1.6 L petrol engines and the corresponding thermostat housing setup, including:

• E46 316i/318i (2000 – 2006)

• E90 316i/318i (2005 – 2011)

• E91/E92/E93 316i/318i (2005 – 2013)

Always verify part number against your VIN or existing gasket prior to installation.

Technical Specifications

• Part Number: 1-890-631 EPS

• Material: High-grade EPDM rubber

• Function: Seal between thermostat housing and engine block

• Thickness: OEM standard profile for correct compression

• Temperature Range: –40 °C … +150 °C

• Chemical Resistance: Engine coolant, antifreeze additives

• Warranty: 24 months genuine-parts coverage

Installation Overview

1. Drain Coolant: Allow the engine to cool, then drain the coolant below the thermostat housing level.

2. Remove Housing: Unbolt and lift off the thermostat housing to expose the old gasket.

3. Clean Surfaces: Scrape away all remnants of the old gasket and clean mating surfaces of oil and debris.

4. Fit New Gasket: Place the new gasket into the housing groove, ensuring full seating around the perimeter.

5. Reassemble: Reinstall the thermostat housing, torque bolts to BMW specification (consult service manual).

6. Refill & Test: Refill the cooling system with proper coolant mixture, bleed air, then run the engine to check for leaks and correct temperature control.