A-RE34009-AI Gasket, HeadOne New Aftermarket Replacement Cylinder Head Gasket Fits John Deere Equipment This aftermarket replacement cylinder head gasket seals the engine cylinder head to the engine block on Fits John Deere 6 101 and 6 619 series diesel engines. A properly seated head gasket maintains combustion chamber pressure and prevents coolant and oil from mixing, making it a critical component during engine rebuilds and overhaul work on this family of large Fits John