Swirl Flap Repair Kit Plug With Gaskets For BMW B37 B47
Solution for Swirl Flap Failures in BMW B37 & B47 Engines
This intake manifold blanking plug addresses the known failure point of vacuum-controlled swirl flaps in BMW B37 and B47 diesel engines. When flaps detach at high mileage, they risk internal engine damage and trigger diagnostic trouble codes. Securing this aluminum replacement over the flap housing keeps the intake path fully sealed, maintaining correct air-fuel ratios and blocking oil seepage into the crankcase. The assembly replaces temporary valve closures with a permanent route to stable idle performance and restored turbocharger efficiency.
Benefits & Installation Tips
- Prevents debris ingestion and eliminates associated vibration noise during acceleration.
- Ensure the gasket seating surface is free of carbon buildup and old adhesive before torquing fasteners to factory specifications.
- Run an ECU adaptation procedure after fitting to recalibrate mass airflow readings for optimal throttle response.
Technical Specifications
- Part Numbers: BOP39
- Primary Material: Machined aluminum body with Viton O-ring
- Mount Position: Front intake manifold runner
- Engine Coverage: B37, B37B, B47, B47B, B47D, B47E, B47F, B47O powerplants
Package Includes
- 1× Aluminum blanking plug
- 1× Viton O-ring
- 4× Replacement gaskets
Compatibility Warnings
Confirm your engine code prior to ordering. This hardware is incompatible with upgraded B47L and B47P engine variants. Professional installation is recommended to preserve manifold integrity and diagnostic system accuracy.
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