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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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FLYWHEEL, CRANKSHAFT, AND MAIN BEARING MAINTENANCE
TM5-4210-229-14&P 6-12.  PISTON AND CONNECTING ROD MAINTENANCE (Continued). c.  Piston and connecting rod installation. (1) Coat the piston and piston ring compressor with clean lubricating oil (Appendix D, Item 37). (2) Install the piston end rod assembly into the piston ring compressor. CAUTION The piston and rod assemblies can be installed by turning the crankshaft only three times.  Position the number 1 and 6 crankpins at top dead center.  Install the number 1 and 6 piston assemblies.  Repeat this procedure for the numbers 2 and 5 and numbers 3 and 4 piston and rod assemblies. (3) Coat the cylinder sleeve generously with clean lubricating oil (Appendix D, Item 37). Install the compressor, with piston and rod, into the cylinder sleeve.  The numbers on the rod must face away from the camshaft while the markings on top of the piston faces toward the camshaft side of the engine. Push down on the piston carefully until it is in the cylinder sleeve.  Avoid striking the sleeve with the connecting rod. (4) Coat the connecting rod journal and con- necting rod bearings with clean engine oil. (a) Install the upper half of the bearing in the connecting rod and pull the rod down onto the journal. (b) Install the connecting rod bearing cap with the numbered side of the cap matching the numbered side of the rod. (c) Install the bolts and torque to 60 ft-lb (80 N.m), then torque to 130 ft-lb (175 N.m). NOTE If bolts will not screw in by hand, reclean the rod threads and try a new bolt.  If a new bolt does not screw in freely, the rod must be discar- ded.  Whenever new bolts are used in a rod, they must be torqued to 130 ft-lb (175 N.m), loosened, and retorqued three times. (5) Install the remaining rods and pistons in the same manner. CAUTION The connecting rod bearings must be fitted. Bearing clearance checked and connecting rod end play checked, as outlined previously, prior to continuing with engine assembly. d.  Install cylinder head and valves (paragraph 6-6). e.  Install oil pan and gasket (paragraph 4-92). 6-35

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