ELRING Cylinder Head Bolt Set - MPN: 267.551

In most modern engine designs, cylinder head bolts are torque-to-yield and are designed for single use. It is strongly recommended to replace them with new ones whenever the cylinder head is removed.

This denotes the bolt's specifications: M12 is the metric thread diameter (12mm), 1.5 is the thread pitch (1.5mm between threads), and 121 is the length of the bolt in millimeters.

A Male Torx (or external Torx) head has the star-shaped recess on the *outside* of the bolt head, requiring a corresponding female Torx socket for tightening and loosening.

The best method is to cross-reference the ELRING MPN 267.551 and the listed compatible OEM part numbers with your vehicle's specific make, model, year, and engine. Consulting a vehicle parts catalog or a qualified mechanic is advised.

This ELRING Cylinder Head Bolt Set comes with a 2-year warranty from the date of purchase.

You will need a torque wrench capable of measuring in the required units (e.g., Nm or ft-lbs) and potentially an angle gauge if the manufacturer specifies angle tightening, in addition to the correct male Torx socket for the bolts.

Ensure threads are clean and properly lubricated as per manufacturer's specifications. Verify the torque wrench is calibrated correctly. Check for any debris in the bolt holes.

Verify that the correct torque sequence and specifications were followed precisely. Double-check the cylinder head gasket and mating surfaces for proper sealing. Confirm the correct bolt part number was used for the application.

Ensure the bolt threads match the thread in the engine block. Clean any debris from the threaded holes in the engine block. Verify the correct bolt length and diameter are being used.