Use guide studs to slide the housing on straight; this prevents damage to the rear main seal.
Torquing the rear structure bolts is not the final step. After the rear structure is torqued, you must install the flywheel housing and check . Cummins Isx Rear Structure Torque Specs
Over-torquing by 50% or more, causing cracked rear structure (aluminum is unforgiving). Solution: Always use a calibrated click-type or digital torque wrench. Use guide studs to slide the housing on
“Clean threads. New bolts every time. First pass, 60 lb-ft. Second pass, 85. Then you release all of them. Let the structure find its neutral. Third pass, 45 lb-ft to snug. Fourth pass, 92 lb-ft. Then 90 degrees. Then you wait four hours. Then you check them all again. And if one moves even a hair—one hair—you throw the bolt away and start over.” Over-torquing by 50% or more, causing cracked rear
: For newer models or high-stress applications, a more rigorous two-step process is often recommended: Step 1 : Tighten to 75 lb-ft . Step 2 : Tighten to 145 lb-ft .