Engine Mounting R2.8 CM2220 R101B Page 1-4 Section 1 - Installation by Subsystem The proper selection of engine mounting isolators is critical to minimize the vibration of the engine to the cab, especially at an idling condition. The position of the engine side isolators should be as close as possible to the engine block to limit the amount of engine vibration transmitted to the chassis. Figure 4 - Three-Point Mounting Aftermarket suppliers can be of assistance in providing pre-engineered components to properly support and isolate the natural engine vibration.
It is recommended to utilize Specialty Equipment Market Association (SEMA) members, as the R2.8 CM2220 R101B computer aided design (CAD) is available to reputable suppliers through their tech transfer program. The four engine-side M12 mounting bosses must be used for the engine mounting brackets. It is recommended to use a quantity of four Class 10.8 M12x1.75 bolts with a minimum thread engagement into the block of 12 mm [0.472 in] but not to exceed 20 mm [0.787 in] when tightened, to install the engine mounts to the cylinder block. Torque Value: Engine Mounting Bracket 115 N•m [ 85 ft-lb ] The mounting bosses are symmetrical on both sides.
Figure 5 shows the dimensions of the engine mounting bosses found on each side of the engine. It is recommended that the engine mounting be designed such that the isolator is positioned in the middle of the bolt pattern. To buy Cummins Parts and Service Manuals, Training Guides, or Tools go to our website at https://store.cummins.com