Product Description
Cummins Cylinder Head Bolt 3678804 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 225mm length, this long cylinder head bolt provides the clamping force required for proper cylinder head installation and sealing.
Used in select Cummins ISX and QSX 15-liter engine configurations. Four of these long bolts are typically required per cylinder head, along with 22 shorter head bolts identified by part number 3678506.
Cross-references PAI 040137 and Interstate-McBee M-3678804.
Sold individually. Verify compatibility with your engine serial number and follow the manufacturer's installation and torque specifications.
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