FITTING 1974637 - Caterpillar

Start By:a. remove cylinder head assemblyb. remove oil panc. remove underframe 1. Remove the bolt, and remove cooling jet (1).2. Check the connecting rods and caps for their identification and location. The connecting rod and the rod cap should have the cylinder number etched on the right side as indicated by the arrow. If not marked, etch each unmarked connecting rod/or cap during removal.3. Remove rod cap bolts (2) and the cap from the connecting rod. Remove the lower half of the bearing from the cap. 4. Push piston and connecting rod (4) away from the crankshaft; then remove upper half of the rod bearing (5).5. Remove the piston and connecting rod. The following steps are for the installation of the pistons and connecting rod assemblies.6. Put clean engine oil on piston rings, piston and cylinder bore. 7. Position the piston ring end gaps 120° apart, and install tooling (A).8. With the number one crankshaft throw at bottom center, install the piston and connecting rod. Some engines use pistons which have the word "FRONT" stamped on the crown of the piston. Be sure the word "FRONT" is toward the front of the engine when the piston is installed. The etched number on the connecting rod must be on the right side and must be installed in the corresponding cylinder.9. Taking care to line up connecting rod and crankshaft, carefully tap the piston into the cylinder bore until tooling (A) comes off the piston.10. Before the connecting rod comes into contact with the crankshaft, install the upper half of the rod bearing. Be sure the bearing tab properly engages with the slot in the connecting rod.11. Put clean engine oil on the upper rod bearing surface, then tap the piston down, guiding the connecting rod onto the crankshaft.12. Position the lower half of rod bearing in the corresponding numbered rod cap. Be sure the bearing tab engages with the grove in the rod caps.13. Put clean engine oil on the lower rod bearing surface; then install the rod cap. Install the bearing cap on the connecting rod with the number on the bearing (rod) cap on the same side and same number as on the connecting rod.14. Put 2P2506 Thread Lubricant on the threads of the bolts. Install rod cap bolts (1), and tighten them to a torque of 130 7 N m (95 5 lb ft). Mark each bolt head, and then tighten each bolt an additional 1/6 60 5° ( turn).15. Repeat the above steps for the remainder of the pistons and connecting rods.End By:a. install underframeb. install oil panc. install cylinder head assemblyDisassemble & Assemble Piston & Connecting Rod Assemblies
Start By:a. remove piston and connecting rod assemblies 1. Use tooling (A), and remove piston rings (1) from piston crown (2). 2. Remove the snap ring and, remove piston pin (3). Separate piston crown (2), piston skirt (4) and connecting rod (5). The following steps are for the assembly of the pistons and connecting