BMW 1 2 Series E81 E87N E90 Screw plug with O-Ring 7553165

The BMW 1 and 2 Series E81/E87N/E90 Turbocharger Plug with O-Ring Seal is an original equipment turbocharger and parts component designed for diesel engines. This used OEM part ensures factory fit, system leak-free operation, and trouble-free operation with the turbocharger equipment in BMW diesel engines.

Specifications and technical data

• SKU: 7553165
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7553165
• Substitutable numbers: 11137553165, 7553165, PK
• Fuel type: Diesel
• Category: Turbos & Parts

Purpose and function in the turbocharging system

The O-ring screw plug operates in the turbocharger system, where maintaining proper sealing of the working fluid is crucial. It is responsible for the safe closure of the manufacturer-designated channel or port, reducing the risk of leaks and pressure drops in the diesel engine.

In practice, this means more stable operating conditions for the turbocharger, proper lubrication and cooling of the mating components, and reduced stress on other components. Using a genuine cap with a matching O-ring seal allows the engine to maintain its operating parameters as designed at the factory.

Compatibility with BMW 1 and 2 Series E81/E87N/E90

This BMW O-ring bolt plug is designed for select 1 and 2 Series models on the E81, E87N, and E90 diesel platforms. This means:

• factory-fitted thread and mounting socket,
• compliance with the geometry of the components working together in the turbocharging system,
• trouble-free installation in place of a worn or damaged cap.

Thanks to this, the part can be used both as a replacement for the factory component and in repairs to the turbocharging system, where tightness and resistance to operating conditions typical of diesel engines are required.

Construction, sealing and performance parameters

A key design element is the integrated O-ring seal, which ensures a tight seal between the plug and the socket. The carefully selected seal cross-section and material reduce the risk of micro-leaks under the fluctuating temperatures and pressures typical of turbocharger operation in a diesel engine.

Original workmanship ensures:

• stable tightening within the assembly torque range provided by the manufacturer,
• resistance to oil, fuel and combustion products typical of diesel engines,
• repeatability of sealing parameters after correct installation.

As a component from the turbocharger and parts category, the cap works with the system as intended by the vehicle manufacturer, which is particularly important when servicing modern diesel engines.

Condition, origin and service use

The offered cap is a used part, sourced from the original BMW system. This choice allows the component to maintain factory specifications while optimizing repair costs. A used OEM part is a good solution in situations where:

• the existing plug has been mechanically damaged or deformed,
• a leak was found in the area of the plug socket,
• a comprehensive service of the turbocharger and diesel engine accessories is carried out.

When installed correctly, in compliance with the manufacturer's recommendations regarding seat cleanliness and tightening torque, the part allows for the restoration of proper system tightness and reduces the risk of re-leakage.

Why choose the original BMW screw cap with O-Ring?

For components operating in a diesel engine turbocharger system, leak-tightness, thermal resistance, and precise fit are key. The original BMW O-Ring Plug ensures:

• compliance with the factory design of the drive unit,
• reducing the risk of incorrect assembly compared to random replacements,
• stable operation of the turbocharger system and engine accessories.

For workshops and users who care about the technical correctness of repairs, this is a practical way to maintain engine operating parameters at a level close to the factory level, while maintaining reasonable service costs.

If you are looking for other items from the turbochargers and BMW parts category, check out the turbochargers and BMW parts available in our store to select components tailored to your specific model.

When planning extensive modifications or servicing of BMW/MINI cars, it's worth exploring the possibilities offered by used OEM parts. For inspiration, read this article about MINI sports versions: MINI John Cooper Works – What Makes It Different and How to Improve Your MINI?