Cummins Isx Head Bolt Torque ((exclusive)) 〈SAFE | PLAYBOOK〉

TTY bolts often have a narrow shank and a serrated washer face. Standard bolts have a thicker, fully threaded body.

| Tool | Purpose | |------|---------| | (250 ft·lb capacity) | Initial 60 & 90 ft·lb stages | | Angle gauge (electronic or mechanical) | +180° and +90° stages | | 30W engine oil | Thread lubricant (never use grease or anti-seize – alters friction) | | Thread chaser (M18x2.5) | Clean block threads | | Straight edge & feeler gauges | Check head flatness | | Liner protrusion gauge | Verify liner height before head install | | New TTY head bolt set | 26–28 bolts + washers (if separate) | cummins isx head bolt torque

Some service manuals list:

| Generation | Years | Key Features | Head Bolt Type | |------------|-------|--------------|----------------| | ISX (Signature) | 2002–2006 | Pre-EGR, 500–600 hp | Standard (reusable?) → TTY transition | | ISX (CM870) | 2003–2007 | EGR, VGT turbo | Torque-to-yield (TTY) | | ISX (CM871) | 2007–2010 | DPF, no SCR | TTY + higher clamp load | | ISX (CM2250) | 2010–2013 | SCR, DEF | TTY, updated metallurgy | | ISX (CM2350) | 2014–2018 | Single-module aftertreatment | TTY, revised torque angles | TTY bolts often have a narrow shank and