Product Description
Cummins Cylinder Head Bolt 3678506 is a heavy-duty flanged hex head bolt designed to secure the cylinder head to the engine block on compatible Cummins ISX and QSX diesel engines.
Featuring M18 x 1.5 threads and a 170mm length, this bolt provides the clamping force required for proper cylinder head installation and sealing.
Used in select Cummins ISX15 and QSX15 engine configurations. A typical ISX cylinder head installation requires 22 of these shorter bolts along with four longer head bolts identified by part number 3678804.
Cross-references Cummins part number 4966356, PAI 040136, and Interstate-McBee M-3678506.
Sold individually. Verify compatibility with your engine serial number and follow the manufacturer's installation and torque specifications.
