Clean the sealing surfaces of the cylinder block and housing thoroughly [5, 5.7]. Lubricate bolt threads and under the bolt heads with clean 15W-40 oil
It is important not to confuse the (securing the housing to the block) with the flywheel bolts (securing the flywheel to the crankshaft). Flywheel Housing (Bellhousing) Bolts: 74-145 ft-lbs
Use guide studs to align the housing and install a new gasket or O-ring [4, 5.7]. Tighten the bolts in a crisscross or zigzag pattern , starting from the center and moving outward [5, 10]. Verification: After installation, it is standard practice to measure bore alignment runout Cummins Isx Flywheel Housing Torque Specs
October 26, 2023 Subject: Technical Service Bulletin - Flywheel Housing Installation Engine Model: Cummins ISX (Includes ISX11.9, ISX12, ISX15, and QSX15)
Install the housing and torque the bolts within 10 to 15 minutes of applying the sealant before it begins to skin over. Critical Inspection Points Before Reassembly Clean the sealing surfaces of the cylinder block
Place the indicator stylus against the inner diameter of the flywheel housing bore.
Clean out the bolt holes using a thread chaser or compressed air to avoid hydraulic locking from trapped oil. 2. Sealant Application Tighten the bolts in a crisscross or zigzag
The torque specs for the flywheel housing depend on the bolt size and the specific engine serial number. However, general guidelines exist for the ISX platform.
Before performing the final torque sequence, you must verify the housing is perfectly centered. Misalignment will destroy the input shaft bearing of your transmission. Mount a dial indicator to the crankshaft flange.