Cometic Multi-layer Steel Head Gasket, BMW N54

This Cometic MLS Head Gasket is designed to replace BMW part numbers 11127557265 and 11127557266, specifically for the N54B30 engine. 

Composed of multiple layers of embossed coated and uncoated stainless steel, MLX gaskets are specially designed to conform to the surfaces of the cylinder head and engine block on the first heat cycle, creating a chemical bond via Cometic's proprietary coatings. These coatings provide a micro-seal for fluids against the head and block surface. 

The layers of the MLX gasket act as a spring, protecting against blowout and increasing active seal height by compensating for increased head lift. 

MLX Head Gaskets are different from MLS because they feature an extra,specialized 'stopper' fold-over layer. This layer provides a torque limiting surface that prevents yielding of the combustion seal. 

It's important to note that MLS/MLX head gaskets are not compatible with engines that have O-rings or receiver grooves around the cylinder bores. These gaskets require smooth and flat surfaces to seal properly.

The factory head gasket specifications for the N54 are 85mm bore and 0.048 inches thickness.

Installation instructions:

1. Make sure that the engine block and cylinder head surfaces are clean, flat, and free from any debris, oil, or coolant.

2. Install the MLX gasket on the engine block and ensure that it is properly aligned. Avoid twisting or bending the gasket during installation.

3. Place the cylinder head on top of the gasket and install the head bolts or studs in their correct positions.

4. Follow the manufacturer's recommended torque specifications and tighten the bolts or studs in the proper sequence to ensure even clamping force across the gasket.

5. After the initial tightening, re-torque the head bolts or studs after the engine has been started and then allowed to cool to room temperature. This will ensure that the gasket is properly seated and compressed.

6. It is recommended to not use any additional sealant on the MLX gasket, as it is already coated with a Viton rubber sealant. Using additional sealant can hinder the performance of the gasket.

BMW N54 Applications:

1 Series

2007-2010     E82/E88     135i
2011-2012     E82     1M

3 Series

2006-2010     E90/E91/E92/E93     335i
2011-2013     E92/E93     335is

5 Series

2008-2010     E60/E61     535i

7 Series

2009-2012     F01/F02     740i / 740Li

X6 Series

2008-2010     E71     X6 xDrive35i

Z4 Series

2009-2016     E89     Z4 sDrive35i
2010-2016     E89     Z4 sDrive35is

Alpina B3 Series

2007-2013     E90/E91/E92/E93     B3 Bi-Turbo

Alpina B3 S Series

2010-2013     E90/E91/E92/E93     B3 S Bi-Turbo

Alpina D3 Series

2008-2013     E90/E91/E92/E93     D3 Bi-Turbo