Engine Mounts 01.01 Rear Engine Mount Replacement 9.1 Place a jack under the rear of the engine, and raise the jack until it’s braced against the engine. WARNING The jack used to lower the engine must be ca- pable of safely lifting and supporting two metric tons. Once the engine is removed from the en- gine stands, do not get under the engine until it is securely installed on the engine mount. An un- secured engine may fall, causing personal injury or death, and component damage. 9.2 Remove the bolt from the left rear engine mount. Save the fasteners, rubber isolator cushions, and snubbers. 9.3 Lift the engine slightly to take its weight off the left rear engine mount.
Place en- gine stands under the engine to keep it off the engine mount. 15. Secure the engine mount to the frame mount. 10. Remove the capscrews that secure the mount to the frame rail. Remove the mount from the frame rail. 15.1 If not in place, set a jack under the rear of the engine and raise the jack until it is braced against the engine. If necessary, remove the four capscrews that se- cure the left engine leg to the flywheel housing, and remove the bracket from the engine. 15.2 Lift the engine slightly to remove the en- gine stands. Remove the stands, and carefully lower the engine onto the engine mount. 11.
Place a new engine mount against the inside of the frame rail, and secure it with bolts, washers, and nuts. Tighten the nuts 45 lbf·ft (61 N·m). 15.3 Holding the lower isolator in place, install the bolt in the left rear engine mount, and secure it with the nut and hardened washer. Tighten the nut 241 lbf·ft (327 N·m). 12. If removed, install the engine leg on the left side of the flywheel housing. Apply thread lock com- pound to the bracket mounting bolts and tighten them as follows: 16. Remove the jack from under the engine, and re- move the chocks from the tires. For Caterpillar 3126 and C-7 engines: tighten the bolts 100 lbf·ft (136 N·m). For Caterpillar C-9, C-10 and C-12 engines:
tighten the bolts 190 lbf·ft (258 N·m). For MBE900 engines: tighten the bolts 92 lbf·ft (125 N·m). For MBE4000 engines: tighten the bolts 175 lbf·ft (237 N·m). 13. Inspect the engine mount rubber isolators for wear or damage and replace them if necessary. CAUTION Do not lubricate the components with oil, grease, or silicone lubricants; they will deteriorate the rubber isolators. 14. Install the upper isolator in the engine mount. If applicable, place the snubber on the isolator. Business Class M2 Workshop Manual, Supplement 5, September 2003 100/2