Mahle GS33409 Engine Cylinder Head Bolt Set

Mahle GS33409 Cylinder Head Bolt Set

Mahle GS33409 is an OEM-standard engine cylinder head bolt set built with steel fasteners and included washers for select BMW inline-six applications. It is specified for M10 x 95 mm use cases and is listed for cast iron cylinder block configurations where noted.

Key Features

• Engine cylinder head bolt set for BMW repair applications
• OEM Standard item grade for factory-style service replacement
• Steel bolt construction with hex head style
• Washers included
• Designed for M10 x 95 mm applications noted in fitment
• Mahle GS33409 part number for catalog matching and ordering

Application Details

This Mahle GS33409 head bolt set is listed for BMW 320i, 323i, 323is, 325i, 325is, 328Ci, 328i, 328is, 525i, 525iT, 528i, and Z3 models across 1991-2000 coverage, with notes that vary by engine block configuration. Fits 2000 BMW 328Ci, N/A; M10 X 95MM; Steel; with Cast Iron Cylinder Block Only. Fits 1996-2000 BMW 328i, N/A; M10 X 95MM; Steel; with Cast Iron Cylinder Block Only. Fits 1997-2000 BMW 528i, N/A; M10 X 95MM; Steel; with Cast Iron Cylinder Block Only. Fits 1997-2000 BMW Z3, N/A; M10 X 95MM; Steel; with Cast Iron Cylinder Block Only. Fits 1997-1999 BMW 323i, N/A; M10 X 95MM; Steel. Fits 1998-1999 BMW 323is, N/A; M10 X 95MM; Steel. Fits 1996-1999 BMW 328is, N/A; M10 X 95MM; Steel; with Cast Iron Cylinder Block Only. Fits 1992-1997 BMW 325i, N/A; M10 X 95MM; Steel. Fits 1992-1995 BMW 320i, N/A; M10 X 95MM; Steel. Fits 1992-1995 BMW 325is, N/A; M10 X 95MM; Steel. Fits 1991-1995 BMW 525i, N/A; M10 X 95MM; Steel. Fits 1993 BMW 525iT, N/A; M10 X 95MM; Steel.

This part cross-references BMW 11 12 1 721 938 and FEL-PRO ES72943 for the same application.

Common Repair Uses

• Replacing stretched or damaged cylinder head bolts during engine service
• Restoring proper cylinder head clamping force after head gasket repair
• Addressing coolant loss or combustion sealing issues tied to head fastener wear
• Correcting torque retention problems after overheating or engine teardown
• Supporting reassembly on BMW 3 Series, 5 Series, and Z3 cylinder head work

Installation Notes

Verify engine block material and M10 x 95 mm specification before installation, since some listed BMW applications require a cast iron cylinder block. Follow the factory torque sequence and tightening procedure for the specific engine code, and replace any fasteners that show stretching, corrosion, or thread damage. Clean the head and block mating surfaces before assembly to help maintain sealing integrity.

Quality Assurance

Mahle supplies sealing and engine hardware products used by OEMs and technicians worldwide. GS33409 is an OEM-standard replacement part built to match the demands of factory-style engine service on select BMW applications.