| Engine Model | Flywheel Bolt Size | Updated Torque Spec | |--------------|--------------------|----------------------| | ISX (Pre-2007, 12-bolt) | M14 | 110 lb-ft + 60° | | | M16 x 2.0 | 125 lb-ft + 90° | | X15 (Performance series) | M16 x 1.5 | 150 lb-ft + 75° |
Inspect all 7/16-24 TPI bolts for signs of stretching or thread damage. Given the high torque requirements and safety implications, many technicians recommend replacing these bolts whenever the flywheel is removed. Related Component Torque Specs
Note: Do not use Loctite unless specifically instructed by a service manual for your specific ESN; Cummins generally recommends oil only. Related Component Specs Flywheel Housing Bolts
He pulled up the factory service manual on his cracked tablet. The page loaded slowly. Section 10: Flywheel & Crankshaft. He scrolled past the warnings, past the Loctite specifications, down to the torque sequence.
Use a brake cleaner and a lint-free cloth to strip all residual grease, anti-seize, or old thread locker from the crankshaft flange and the back of the flywheel.
Jake couldn’t afford a third.
Most manufacturer manuals do not recommend using Loctite on these specific bolts when oiled, as it can interfere with achieving accurate torque readings.
: Snug all bolts down to 60 ft-lbs (81 Nm) in a star pattern.
| Engine Model | Flywheel Bolt Size | Updated Torque Spec | |--------------|--------------------|----------------------| | ISX (Pre-2007, 12-bolt) | M14 | 110 lb-ft + 60° | | | M16 x 2.0 | 125 lb-ft + 90° | | X15 (Performance series) | M16 x 1.5 | 150 lb-ft + 75° |
Inspect all 7/16-24 TPI bolts for signs of stretching or thread damage. Given the high torque requirements and safety implications, many technicians recommend replacing these bolts whenever the flywheel is removed. Related Component Torque Specs
Note: Do not use Loctite unless specifically instructed by a service manual for your specific ESN; Cummins generally recommends oil only. Related Component Specs Flywheel Housing Bolts torque spec for flywheel bolts on isx cummins 251 updated
He pulled up the factory service manual on his cracked tablet. The page loaded slowly. Section 10: Flywheel & Crankshaft. He scrolled past the warnings, past the Loctite specifications, down to the torque sequence.
Use a brake cleaner and a lint-free cloth to strip all residual grease, anti-seize, or old thread locker from the crankshaft flange and the back of the flywheel. | Engine Model | Flywheel Bolt Size |
Jake couldn’t afford a third.
Most manufacturer manuals do not recommend using Loctite on these specific bolts when oiled, as it can interfere with achieving accurate torque readings. Related Component Specs Flywheel Housing Bolts He pulled
: Snug all bolts down to 60 ft-lbs (81 Nm) in a star pattern.